apl. Prof. Dr.-Ing.

Holger Class

Akademischer Oberrat
Institute for Modelling Hydraulic and Environmental Systems
Department of Hydromechanics and Modelling of Hydrosystems

Contact

+49 711 685-64678
+49 711 685-60430

Business card (VCF)

Pfaffenwaldring 61
70569 Stuttgart
Germany
Room: 1.012

Environmental Fluid Mechanics I lecture | exercise

Abitur
June 1991 in Münsingen (Germany)
Studium
Bauingenieur, Diplom April 1997 Universität Stuttgart (Germany)
Promotion
October 2000 Technische Universität Braunschweig (Germany)
Habilitation
June 2008 Universität Stuttgart (Germany)
sincecOktober 2000
Institute for Modelling Hydraulic and Environmental Systems, Universität Stuttgart

publications

  1. article

    1. Seitz, G., Class, H., & Helmig, R. (2019). A numerical modeling study on the influence of porosity changes during thermochemical heat storage. Applied Energy. Retrieved from https://www.sciencedirect.com/science/article/abs/pii/S0306261919318392?via%3Dihub
    2. Koch, T., Heck, K., Schröder, N., Class, H., & Helmig, R. (2018). A new simulation framework for soil-root interaction, evaporation, root growth, and solute transport. Vadose Zone Journal. https://doi.org/10.2136/vzj2017.12.0210
    3. Cunningham, A. B., Class, H., Ebigbo, A., Gerlach, R., Phillips, A., & Hommel, J. (2018). Field-scale modeling of microbially induced calcite precipitation. Computational Geosciences, tbd. https://doi.org/10.1007/s10596-018-9797-6
    4. Koch, T., Gläser, D., Weishaupt, K., Ackermann, S., Beck, M., Becker, B., … Weinhardt, F. (2018). DuMuX 3.0.0. https://doi.org/10.5281/zenodo.2479595
    5. Hommel, J., Coltman, E., & Class, H. (2018). Porosity-Permeability Relations for Evolving Pore Space: A Review with a Focus on (Bio-)geochemically Altered Porous Media. Transport in Porous Media, 2(124). https://doi.org/10.1007/s11242-018-1086-2
    6. Gläser, D., Flemisch, B., Helmig, R., & Class, H. (2018). A hybrid-dimensional discrete fracture model for non-isothermal two-phase flow in fractured porous media.
    7. Gläser, D., Helmig, R., Flemisch, B., & Class, H. (2017). A discrete fracture model for two-phase flow in fractured porous media. Advances in Water Resources, 110. https://doi.org/10.1016/j.advwatres.2017.10.031
    8. Kissinger, A., Noack, V., Knopf, S., Konrad, W., Scheer, D., & Class, H. (2016b). Regional-scale brine migration along vertical pathways due to CO2 injection - Part 2: a simulated case study in the North German Basin. Hydrology and Earth System Sciences (HESS).
    9. Beck, M., Seitz, G., & Class, H. (2016). Volume-Based Modelling of Fault Reactivation in Porous Media Using a Visco-Elastic Proxy Model. Transport in Porous Media.
    10. Kissinger, A., Noack, V., Knopf, S., Konrad, W., Scheer, D., & Class, H. (2016a). Brine migration along vertical pathways due to CO2 injection - a simulated case study in the North German Basin with stakeholder involvement. https://doi.org/10.5194/hess-2016-281
    11. Weishaupt, K., Bordenave, A., Atteia, O., & Class, H. (2016). Numerical Investigation on the Benefits of Preheating for an Increased Thermal Radius of Influence During Steam Injection in Saturated Soil. Transport in Porous Media. https://doi.org/10.1007/s11242-016-0624-z
    12. Hommel, J., Ebigbo, A., Gerlach, R., Cunningham, A. B., Helmig, R., & Class, H. (2016). Finding a balance between accuracy and effort for modeling biomineralization. Energy Procedia, 97. https://doi.org/10.1016/j.egypro.2016.10.028
    13. Scheer, D., Konrad, W., Class, H., Kissinger, A., Knopf, S., & Noack, V. (2016). Regional-scale brine migration along vertical pathways due to CO2 injection - Part 1: the participatory modeling approach. Hydrology and Earth System Sciences (HESS).
    14. Hommel, J., Lauchnor, E., Gerlach, R., Cunningham, A. B., Ebigbo, A., Helmig, R., & Class, H. (2016). Investigating the influence of the initial biomass distribution and injection strategies on biofilm-mediated calcite precipitation in porous media. Transport in Porous Media, 114(2). https://doi.org/10.1007/s11242-015-0617-3
    15. Kleinknecht, S., Class, H., & Braun, J. (2015). Density-driven migration of heavy NAPL vapor in the unsaturated zone. Vadose Zone Journal, 14(8). https://doi.org/10.2136/vzj2014.12.0173
    16. Scheer, D., Konrad, W., Class, H., Kissinger, A., Knopf, S., & Noack, V. (2015). Expert involvement in science development: (re-)evaluation of an early screening tool for carbon storage site characterization. International Journal of Greenhouse Gas Control, 37.
    17. Class, H., Mahl, L., Ahmed, W., Norden, B., Kühn, M., & Kempka, T. (2015). Matching Pressure Measurements and Observed CO2 Arrival Times with Static and Dynamic Modelling at the Ketzin Storage site. Energy Procedia, 76.
    18. Hommel, J., Lauchnor, E., Phillips, A., Gerlach, R., Cunningham, A. B., Helmig, R., … Class, H. (2015). A revised model for microbially induced calcite precipitation: Improvements and new insights based on recent experiments. Water Resources Research, 51(5). https://doi.org/10.1002/2014WR016503
    19. Gerbersdorf, S. U., Cimatoribus, C., Class, H., Engesser, K.-H., Helbich, S., Hollert, H., … Wieprecht, S. (2015). Anthropogenic Trace Compounds (ATCs) in aquatic habitats - Research needs on sources, fate, detection and toxicity to ensure timely elimination strategies and risk management. Environment International, Vol.79.2015. https://doi.org/10.1016/j.envint.2015.03.011
    20. Kissinger, A., Noack, V., Knopf, S., Scheer, D., Konrad, W., & Class, H. (2014). Characterization of reservoir conditions for CO2 storage using a dimensionless Gravitational Number applied to the North German Basin. Sustainable Energy Technologies and Assessments, 7. https://doi.org/10.1016/j.seta.2014.06.003
    21. Schaedle, P., Hubschwerlen, N., & Class, H. (2014). Optimizing the modeling performance for safety assessments of nuclear waste repositories by approximating two-phase flow and transport by single-phase transport simulations. Nuclear Technology, 187.
    22. Helmig, R., Flemisch, B., Wolff, M., Ebigbo, A., & Class, H. (2013). Model coupling for multiphase flow in porous media. Advances in Water Resources, 51. https://doi.org/10.1016/j.advwatres.2012.07.003
    23. Kempka, T., Class, H., Görke, U.-J., Norden, B., Kolditz, O., Kühn, M., … Zehner, B. (2013). A dynamic flow simulation code intercomparison based on the revised static model of the Ketzin pilot site. Energy Procedia, 40.
    24. Oladyshkin, S., Class, H., & Nowak, W. (2013). Bayesian updating via Bootstrap filtering combined with data-driven polynomial chaos expansions: methodology and application to history matching for carbon dioxide storage in geological formations. Computational Geosciences, 17(4). https://doi.org/10.1007/s10596-013-9350-6
    25. Juanes, R., & Class, H. (2013). Special issue on computational methods in geologic CO2 sequestration. Advances in Water Resources, 62. https://doi.org/10.1016/j.advwatres.2013.10.012
    26. Oladyshkin, S., Schröder, P., Class, H., & Nowak, W. (2013). Chaos expansion based Bootstrap filter to calibrate CO2 injection models. Energy Procedia, (40). https://doi.org/10.1016/j.egypro.2013.08.046
    27. Lange, T., Sauter, M., Heitfeld, M., Schetelig, K., Brosig, K., Jahnke, W., … Class, H. (2013). Hydraulic fracturing in unconventional gas reservoirs: risks in the geological system, part 1. Environmental Earth Sciences. https://doi.org/10.1007/s12665-013-2803-3
    28. Kissinger, A., Helmig, R., Ebigbo, A., Class, H., Lange, T., Sauter, M., … Jahnke, W. (2013). Hydraulic fracturing in unconventional gas reservoirs: risks in the geological system, part 2. Environmental Earth Sciences. https://doi.org/10.1007/s12665-013-2578-6
    29. Walter, L., Binning, P. J., & Class, H. (2013). Predicting salt intrusion into freshwater aquifers resulting from CO2 injection - a study on the influence of conservative assumptions. Advances in Water Resources, 62.
    30. Hommel, J., Cunningham, A. B., Helmig, R., Ebigbo, A., & Class, H. (2013). Numerical Investigation of Microbially Induced Calcite Precipitation as a Leakage Mitigation Technology. Energy Procedia, 40,2013. https://doi.org/10.1016/j.egypro.2013.08.045
    31. Bauer, S., Class, H., Ebert, M., Feeser, V., Götze, H., Holzheid, A., … Dahmke, A. (2012). Modeling, parameterization and evaluation of monitoring methods for CO2 storage in deep saline formations: the CO2-MoPa project. Environmental Earth Sciences, 67. https://doi.org/10.1007/s12665-012-1707-y
    32. Walter, L., Binning, P. J., Oladyshkin, S., Flemisch, B., & Class, H. (2012). Brine migration resulting from CO2 injection into saline aquifers - An approach to risk estimation including various levels of uncertainty. International Journal of Greenhouse Gas Control, 9. Retrieved from https://www.sciencedirect.com/science/article/pii/S1750583612001077
    33. Walter, L., Oladyshkin, S., Class, H., Darcis, M., & Helmig, R. (2011). A study on pressure evolution in a sand channel system during CO2 injection. Energy Procedia, 4.
    34. Schäfer, F., Walter, L., Class, H., & Müller, C. (2011). The regional pressure impact of CO2 storage: a showcase study from the North German Basin. Environmental Earth Sciences. https://doi.org/10.1007/s12665-011-1184-8
    35. Neuweiler, I., Papafotiou, A., Class, H., & Helmig, R. (2011). Estimation of effective parameters for a two-phase flow problem in non-Gaussian heterogeneous porous media. Journal of Contaminant Hydrology, 120–121(1). https://doi.org/10.1016/j.jconhyd.2010.08.001
    36. Oladyshkin, S., Class, H., Helmig, R., & Nowak, W. (2011a). A concept for data-driven uncertainty quantification and its application to carbon dioxide storage in geological formations. Advances in Water Resources, 34. https://doi.org/10.1016/j.advwatres.2011.08.005
    37. Darcis, M., Class, H., Flemisch, B., & Helmig, R. (2011). Sequential model coupling for feasibility studies of CO2 storage in deep saline aquifers. Oil & Gas Science and Technology-Revue de l’IFP, 66(1). https://doi.org/10.2516/ogst/2010037
    38. Tatomir, A., Szymkiewicz, A., Class, H., & Helmig, R. (2011). Modeling two phase flow in large scale fractured porous media with an extended multiple interacting continua method. Computer Modeling in Engineering & Sciences.
    39. Oladyshkin, S., Class, H., Helmig, R., & Nowak, W. (2011b). An integrative approach to robust design and probabilistic risk assessment for CO2 storage in geological formations. Computational Geosciences, 15(3). https://doi.org/10.1007/s10596-011-9224-8
    40. Kopp, A., Binning, P. J., Johannsen, K., Helmig, R., & Class, H. (2010). A contribution to risk analysis for leakage through abandoned wells in geological CO2 storage. Advances in Water Resources, 33(8). https://doi.org/10.1016/j.advwatres.2010.05.001
    41. Kempka, T., Kühn, M., Class, H., Frykman, P., Kopp, A., Nielsen, C. M., & Probst, P. (2010). Modelling of CO2 arrival time at Ketzin - Part I. International Journal of Greenhouse Gas Control, 4. https://doi.org/10.1016/j.ijggc.2010.07.005
    42. Ebigbo, A., Helmig, R., Cunningham, A. B., Class, H., & Gerlach, R. (2010). Modelling biofilm growth in the presence of carbon dioxide and water flow in the subsurface. Advances in Water Resources, 33(7). https://doi.org/10.1016/j.advwatres.2010.04.004
    43. Ochs, S. O., Class, H., Färber, A., & Helmig, R. (2010). Methods for predicting the spreading of steam below the water table during subsurface remediation. Water Resources Research, 46. https://doi.org/10.1029/2007WR006401
    44. Class, H., Dahle, H. K., & Helmig, R. (2009). Preface (to the Special Issue). Computational Geosciences, 13. https://doi.org/10.1007/s10596-009-9160-z
    45. Darcis, M., Class, H., & Flemisch, B. (2009). Coupling Models of Different Complexity for the Simulation of CO2 Storage in Saline Aquifers. Energy Procedia, 1. Retrieved from https://www.sciencedirect.com/science/article/pii/S187661020900232X
    46. Kopp, A., Class, H., & Helmig, R. (2009b). Investigations on CO2 storage capacity in saline aquifers - Part 2: Estimation of storage capacity coefficients. International Journal of Greenhouse Gas Control, 3(3). https://doi.org/10.1016/j.ijggc.2008.10.001
    47. Kopp, A., Class, H., & Helmig, R. (2009a). Investigations on CO2 storage capacity in saline aquifers - Part 1: Dimensional analysis of flow processes and reservoir characteristics. International Journal of Greenhouse Gas Control, 3(3). https://doi.org/10.1016/j.ijggc.2008.10.002
    48. Kopp, A., Probst, P., Class, H., Hurter, S., & Helmig, R. (2009). Estimation of CO2 storage capacity coefficients in geologic formations. Energy Procedia, 1(1). https://doi.org/10.1016/j.egypro.2009.02.060
    49. Class, H., Ebigbo, A., Helmig, R., Dahle, H. K., Nordbotten, J. M., Celia, M. A., … Wei, L. (2009). A benchmark study on problems related to CO2 storage in geologic formations: Summary and discussion of the results. Computational Geosciences, 13(4). https://doi.org/10.1007/s10596-009-9146-x
    50. Kopp, A., Ebigbo, A., Bielinski, A., Class, H., & Helmig, R. (2009). Numerical simulation of temperature changes caused by CO2 injection in geological reservoirs. Carbon Dioxide Sequestration in Geological Media - State of the Science, (59).
    51. Freiboth, S., Class, H., Helmig, R., Graf, T., Ehlers, W., Schwarz, V., & Vrettos, C. (2009). A model for multiphase flow and transport in porous media including a phenomenological approach to account for deformation - a model concept and its validation within a code intercomparison study. 13(3). https://doi.org/10.1007/s10596-008-9118-6
    52. Dogan, M. O., Class, H., & Helmig, R. (2009). Different concepts for the coupling of porous-media flow with lower-dimensional pipe flow. Computer Modeling in Engineering & Sciences, 53(3). https://doi.org/10.3970/cmes.2009.053.207
    53. Bielinski, A., Kopp, A., Schütt, H., & Class, H. (2008). Monitoring of CO2 plumes during storage in geological formations using temperature signals: numerical investigation. (2). https://doi.org/10.1016/j.ijggc.2008.02.008
    54. Class, H., Helmig, R., & Neuweiler, I. (2008). Sequential coupling of models for contaminant spreading in the vadose zone. Vadose Zone Journal, 7(2). https://doi.org/10.2136/vzj2007.0056
    55. Ebigbo, A., Class, H., & Helmig, R. (2007). CO2 leakage through an abandoned well: Problem-oriented benchmarks. 11(2). https://doi.org/10.1007/s10596-006-9033-7
    56. Helmig, R., Niessner, J., & Class, H. (2006). Recent advances in finite element methods for multi-phase flow processes in porous media. 20(03_04). https://doi.org/10.1080/00036810600792154
    57. Acosta, M., Merten, C., Eigenberger, G., Class, H., Helmig, R., Thoben, B., & Müller-Steinhagen, H. (2006). Modeling non-isothermal two-phase multicomponent flow in the cathode of PEM fuel cells. (2). https://doi.org/10.1016/j.jpowsour.2005.12.068
    58. Class, H., Bielinski, A., Helmig, R., Kopp, A., & Ebigbo, A. (2006). Numerische Simulation der Speicherung von CO2 in geologischen Formationen. 78(4).
    59. Class, H., & Helmig, R. (2002). Numerical simulation of nonisothermal multiphase multicomponent processes in porous media - 2. Applications for the injection of steam and air. 25(5). https://doi.org/10.1016/S0309-1708(02)00015-5
    60. Class, H., Mahl, L., Ahmed, W., Norden, B., Kühn, M., & Kempka, T. (1963). Matching pressure measurements and observed CO2 arrival times with static and dynamic modelling at the Ketzinstorage site.
  2. book

    1. Helmig, R., & Class, H. (2005). Grundlagen der Hydromechanik. Shaker Verlag.
  3. incollection

    1. Class, H., Kissinger, A., Knopf, S., Konrad, W., Noack, V., & Scheer, D. (2015a). Combined Natural and Social Science Approach for Regional-Scale Characterisation of CO2 Storage Formations and Brine Migration Risks (CO2BRIM). Springer-Verlag.
  4. inproceedings

    1. Hommel, J., Phillips, A., Gerlach, R., Cunningham, A. B., Helmig, R., & Class, H. (2017). Modeling porous medium modification through induced calcite precipitation. 7th GACM Colloquium on Computational Mechanics , 11.10.2017 - 13.10.2017, Stuttgart. Retrieved from https://dx.doi.org/10.18419/opus-9334
    2. Oladyshkin, S., Class, H., Helmig, R., & Nowak, W. (2011c). Data-driven framework for history matching: application to carbon dioxide storage in geological formations. European Geosciences Union (EGU) - General Assembly, 03.04.2011 - 08.04.2011, Vienna, Austria, Vol.13(EGU2011-11).
    3. Oladyshkin, S., Class, H., Helmig, R., & Nowak, W. (2010a). Data-driven robust design and probabilistic risk assessment: application to underground carbon dioxide storage, Abstract H41L-03. AGU Fall Meeting 2010, 13.12.2010 - 17.12.2010, San Francisco, USA.
    4. Oladyshkin, S., Class, H., Helmig, R., & Nowak, W. (2010b). Probabilistic risk assessment for CO2 storage in geological formations: robust design and support for decision making under uncertainty. Geophysical Research Abstracts, Vol.12(EGU2010-3559). E. Schweizerbart’sche Verlagsbuchhandlung.
    5. Oladyshkin, S., Class, H., Hofmann, R., & Nowak, W. (2010). Highly efficient tool for probabilistic risk assessment of CCS joint with injection design. In J. Carrera (Ed.), Computational Methods in Water Resources (CMWR), XVIII International Conference on Water Resources, 21.06.2010 - 24.06.2010, Barcelona, Spain (By J. Carrera). C.F. Müller Verlag.
    6. Helmig, R., Class, H., Darcis, M., Niessner, J., Erbertseder, K., Perfahl, H., & Reuss, M. (2008). Transfer of modeling concepts for flow and transport processes in porous media systems to biological tissues. DFG Expertengespräch Medizintechnik, 06.11.2008 - 07.11.2008, Potsdam.
    7. Helmig, R., Darcis, M., & Class, H. (2008). Transfer of modeling concepts for flow and transport processes in porous media from subsurface systems to biological tissues. ASME International Mechanical Engineering Congress and Exposition, 31.10.2008 - 06.11.2008, Boston, 12(WOS:000265081000004). Thema Umwelt - Praktischer Umweltschutz Schweiz.
    8. Kopp, A., Probst, P., Class, H., Hurter, S., & Helmig, R. (2008). Estimation of CO2 Storage Capacity Coefficients in Geologic Formations. 9th International Conference on Greenhouse Gas Control Technologies (GHGT9), 16.11.2008 - 20.11.2008, Washington DC, USA.
    9. Class, H., Ebigbo, A., & Kopp, A. (2007). Numerical modeling of CO2 storage in geological formations - recent developments and challenges. 1. French-German Symposium on Geological Storage of CO2, 21.06.2007 - 22.06.2007, Potsdam, (ScienceReportNo.9). Retrieved from https://www.iws.uni-stuttgart.de/publikationen/hydrosys/paper/class-d-f-07.pdf
    10. Freiboth, S., Class, H., & Helmig, R. (2007). Numerical Simulation of Multiphase Multicomponent Processes Considering Structural Alterations of Porous Media - a Phenomenological Model. In T. Schanz (Ed.), Theoretical and Numerical Unsaturated Soil Mechanics (By T. Schanz). Springer-Verlag.
    11. Ochs, S. O., Class, H., Helmig, R., & Acosta, M. (2007). Simulation of multiphase multicomponent processes in the diffusion layer of PEM fuel cells. In M. Qintard (Ed.), Eurotherm 81, ALbi, France, 04.06.2007 - 06.06.2007, Albi, France (By M. Qintard).
    12. Ochs, S. O., Class, H., & Helmig, R. (2006). Fortschritte bei der Entwicklung eines prognosefähigen numerischen Modells zur Simulation der Dampfinjektion in die gesättigte Bodenzone. In J. Braun & H.-P. & M. S. Koschitzky (Eds.), VEGAS - Statuskolloquium 2006, 28.09.2006 - 28.09.2006, Stuttgart (By J. Braun & H.-P. & M. S. Koschitzky).
    13. Ebigbo, A., Bielinski, A., Kopp, A., Class, H., & Helmig, R. (2006, June). Numerical Modeling of CO2 Sequestration with MUFTE-UG. Retrieved from http://www.iws.uni-stuttgart.de/publikationen/hydrosys/paper/CMWR2006UniStuttgart.pdf
    14. Helmig, R., Miller, C. T., Jakobs, H., Class, H., Hilpert, M., Kees, C. E., & Niessner, J. (2006). Multiphase Flow and Transport Modeling in Heterogeneous Porous Media. Progress in Industrial Mathematics at ECMI 2004, 21.06.2004 - 25.06.2004, Eindhoven University of Technology. Springer-Verlag.
    15. Greiner, P., Braun, J., Class, H., Koschitzky, H.-P., Schnieders, J., & Stadler, L. (2005). Numerische Modellierung der Mehrphasen-/Mehrkomponenten-Hydraulik bei der Alkoholspülung. In J. Braun & H. P. & M. M. Koschitzky (Eds.), Ressource Untergrund, 10 Jahre VEGAS: Forschung und Technologieentwicklung zum Schutz von Grundwasser und Boden, 28.09.2005 - 29.09.2005, Universität Stuttgart (By J. Braun & H. P. & M. M. Koschitzky).
    16. Ochs, S. O., Class, H., & Färber, A. (2005). Numerische und experimentelle Untersuchung zur Dampfinjektion in die gesättigte Bodenzone. In J. Braun & H. P. & M. M. Koschitzky (Eds.), Ressource Untergrund, 10 Jahre VEGAS: Forschung und Technologieentwicklung zum Schutz von Grundwasser und Boden, 28.09.2005 - 29.09.2005, Universität Stuttgart (By J. Braun & H. P. & M. M. Koschitzky).
    17. Class, H., & Ochs, S. O. (2005). Ein Konzept zur Kopplung numerischer Module für die Simulation von Schadstoffversickerung, -susbreitung und thermischer Sanierung. In J. Braun & H. P. & M. M. Koschitzky (Eds.), Ressource Untergrund, 10 Jahre VEGAS: Forschung und Technologieentwicklung zum Schutz von Grundwasser und Boden, 28.09.2005 - 29.09.2005, Universität Stuttgart (By J. Braun & H. P. & M. M. Koschitzky).
    18. Färber, A., Class, H., Jie, D., Koschitzky, H.-P., Müller, C., Ochs, S. O., … Steidinger, S. (2004). Dampf-Luft-Injektion zur In-situ-Sanierung der gesättigten Bodenzone: Anwendungsmöglichkeiten und Erfahrungen aus einer PCE-Sanierung in Albstadt. In B. Barczewski, H.-P. Koschitzky, & K. & R. W. Weber (Eds.), VEGAS - Statuskolloquium 2004, 05.10.2004, Universität Stuttgart (By B. Barczewski, H.-P. Koschitzky, & K. & R. W. Weber).
    19. Hölzemann, S., Class, H., & Helmig, R. (2004). A New Concept for the Numerical Simulation and Parameter Identification of Multiphase Flow and Transport Processes in Cohesive Soils. In T. Schanz (Ed.), Unsaturated Soils: Numerical and Theoretical Approaches - Proceedings of the International Conference “From Experimental Evidence towards Numerical Modelling of Unsaturated Soils”, 18.09.2003 - 19.09.2003, Bauhaus-Universität Weimar (By T. Schanz). Springer-Verlag.
    20. Bielinski, A., Class, H., & Helmig, R. (2003). Numerische Simulation von CO2-Speicherung im Untergrund. 4. Workshop “Porous Media”, 05.12.2002 - 06.12.2002, Blaubeuren.
    21. Jakobs, H., Bielinski, A., Class, H., & Helmig, R. (2002). Modeling of heterogeneities for twophase flow in the subsurface. International Conference on Multifield Problems, 08.04.2002 - 10.04.2002, Stuttgart, 12(WOS:000189408100035). Springer-Verlag.
    22. Class, H., Bielinski, A., & Helmig, R. (2002). CO2-Injektion in geologische Formationen - numerische Berechnungen und erste Überlegungen für großskalige Experimente in VEGAS. VEGAS Statuskolloquium, 12.10.2001, Universität Stuttgart.
    23. Class, H., Bielinski, A., & Helmig, R. (2001). Numerische Simulation von Mehrphasen-Mehrkomponenten-Systemen: Effiziente Algorithmen, Möglichkeiten und Probleme. VEGAS Statuskolloquium, 12.10.2001, Universität Stuttgart.
    24. Class, H., & Helmig, R. (1999). Numerische Modellierung von thermisch unterstützter Bodenluftabsaugung. VEGAS Statuskolloquium, 12.10.2001, Universität Stuttgart.
  5. mastersthesis

    1. Class, H. (1997). Numerische Untersuchungen zum Gas-Wasser-Verhalten in einem Stollen mit Verschlußbauwerk (Diplomarbeit). Universität Stuttgart, Institut für Wasserbau.
  6. phdthesis

    1. Class, H. (2008). Models for non-isothermal compositional gas-liquid flow and transport in porous media (Habilitationsschrift, Universität Stuttgart, Institut für Wasserbau). Retrieved from https://elib.uni-stuttgart.de/opus/volltexte/2009/3847/pdf/class_habil_version1.1.pdf
    2. Class, H. (2001). Theorie und numerische Modellierung nichtisothermer Mehrphasenprozesse in NAPL-kontaminierten porösen Medien (Promotionsschrift, Universität Stuttgart, Institut für Wasserbau; Vol. 105). Retrieved from https://elib.uni-stuttgart.de/opus/volltexte/2005/2436/pdf/promo_holle.pdf
  7. techreport

    1. Class, H., Kissinger, A., Knopf, S., Konrad, W., Noack, V., & Scheer, D. (2015b). Schlussbericht: Mehrstufige und regionale Charakterisierung potentieller CO2-Speicherformationen unter besonderer Berücksichtigung von Soleaufstiegsrisiken - ein integrierter natur- und sozialwissenschaftlicher Ansatz (Bericht No. 04/15; Vol. LH223).
    2. Zigelli, N., Kissinger, A., & Class, H. (2014). Modeling the migration of fracturing fluids into shallow groundwater systems - literature review and numerical simulations (Bericht No. TB09/2014; Vol. LH222). Retrieved from https://www.iws.uni-stuttgart.de/publikationen/hydrosys/paper/2014/Zigelli_etal_2014.pdf
    3. Darcis, M., Flemisch, B., & Class, H. (2012). CO2-MoPa -- Kopplung von DuMux und OGS zur Verifikation der OGS-Eclipse Kopplung -- Untersuchung von zeitlichen und räumlichen Modellkopplungsstrategien zur Effizienzsteigerung (Bericht No. 10/12; Vol. LH221).
    4. Ebigbo, A., Phillips, A., Gerlach, R., Helmig, R., Cunningham, A. B., Class, H., & Spangler, L. H. (2012). Darcy-scale modeling of microbially induced carbonate mineral precipitation in sand columns. In Water Resources Research (Bericht No. W07519). https://doi.org/10.1029/2011WR011714
    5. Class, H., Brauer, K., Kissinger, A., Walter, L., Darcis, M., & Ebigbo, A. (2011). Beeinträchtigung von Grundwasser durch Speicherung von Gasen im Untergrund (Bericht No. 15/2011; Vol. LH220). Retrieved from https://www.iws.uni-stuttgart.de/publikationen/hydrosys/paper/2012/WB15-2011-LH2-20.pdf
    6. Ebigbo, A., Class, H., & Helmig, R. (2008). Numerische Untersuchung zur CO2 Sequestrierung in geologischen Formationen - problemorientierte Benchmarks (Bericht No. 10_2008; Vol. LH218).
    7. Kopp, A., Class, H., & Helmig, R. (2007). Treibhausgase in der Bodenfalle (Bericht No. 99). Retrieved from UNI-Kurier website: https://www.iws.uni-stuttgart.de/publikationen/hydrosys/paper/Stuttgarter-UniKurier-Nr99-pg54-Juni2007-Treibhausgase_in_der_Bodenfalle.pdf
    8. Dogan, M. O., Class, H., & Helmig, R. (2007). Numerische Modellierung von Mehrphasenströmungs- und Transportprozessen bei der Sequestrierung von CO2 in geologischen Formationen (Bericht No. 09_2007; Vol. LH215). Retrieved from https://www.iws.uni-stuttgart.de/publikationen/hydrosys/paper/co2trap_wissenschaftlicher_bericht.pdf
    9. Helmig, R., Class, H., Ölmann, U., & Niessner, J. (2006). Multiphase Processes in Porous Media. In R. Helmig & B. Mielke, Alexanderand Wohlmuth (Eds.), Multifield Problems in Solid and Fluid Mechanics (Bericht No. 28). Springer-Verlag.
    10. Assteerawatt, A., Bastian, P., Bielinski, A., Breiting, T., Class, H., Ebigbo, A., … Ölmann, U. (2005). MUFTE-UG: Structure, Applications andNumerical Methods [Bericht]. Retrieved from https://www.iws.uni-stuttgart.de/publikationen/hydrosys/paper/IGWMC_newsletter_MUFTE.pdf
    11. Sheta, H., Class, H., & Helmig, R. (1998). Numerische Simulation von isothermen/ nichtisothermen Mehrphasenströmungen unter Berücksichtigung der Veränderung der Fluideigenschaften. In PWAB-Statuskolloquium, 17.03.1998 - 18.03.1998, Karlsruhe [Bericht].

posters

  1. J. Hommel, A. Phillips, R. Gerlach, A. B. Cunningham, R. Helmig, and H. Class, “Modeling field-scale applications of microbially induced calcium carbonate precipitation,” 2nd International Conference on Simulation Technology (SimTech 2018), 26.03.2018 - 28.03.2018, Stuttgart. Mar-2018.
  2. M. Beck and H. Class, “Comparison of sequential and fully-coupled approaches for flow and geomechanics,” European Geosciences Union (EGU) - General Assembly, 08.04.2018 - 13.04.2018, Vienna, Austria. Apr-2018.
  3. J. Hommel, A. Phillips, R. Gerlach, A. B. Cunningham, R. Helmig, and H. Class, “Modeling field-scale applications of microbially induced calcium carbonate precipitation,” Computational Methods in Water Resources (CMWR) XXII, 04.06.2018 - 07.06.2018, St. Malo, Frankreich. Jun-2018.
  4. G. Seitz, R. Helmig, and H. Class, “Numerical Model of a Ca(OH)2 / CaO thermochemical heat storage reactor,” 9th International Conference on Porous Media & Annual Meeting - InterPore 2017, 08.05.2017 - 11.05.2017, Rotterdam, The Netherlands. May-2017.
  5. J. Hommel, A. Ebigbo, R. Gerlach, A. B. Cunningham, R. Helmig, and H. Class, “Finding a balance between accuracy and computational effort for modeling biomineralization,” 1st SRP NUPUS Meeting, 05.10.2016 - 07.10.2016, Mühlhausen im Täle. Oct-2016.
  6. J. Hommel, A. Ebigbo, R. Gerlach, A. B. Cunningham, R. Helmig, and H. Class, “Finding a balance between accuracy and effort for modeling biomineralization,” Gordon Research Seminar on Flow and Transport in Permeable Media, 30.07.2016 - 31.07.2016, Girona, Spanien. Jul-2016.
  7. J. Hommel, A. Ebigbo, R. Gerlach, A. B. Cunningham, R. Helmig, and H. Class, “Finding a balance between accuracy and effort for modeling biomineralization,” Gordon Research Conference on Flow and Transport in Permeable Media, 01.08.2016 - 05.08.2016, Girona, Spanien. Aug-2016.
  8. J. Hommel, A. Ebigbo, R. Gerlach, A. B. Cunningham, R. Helmig, and H. Class, “Finding a balance between accuracy and computational effort for modeling biomineralization,” EGU General Assembly 2016, 18.04.2016 - 22.04.2016, Vienna, Austria. Apr-2016.
  9. J. Hommel, A. Ebigbo, R. Gerlach, A. B. Cunningham, R. Helmig, and H. Class, “Finding a balance between accuracy and effort for modeling biomineralization,” NUPUS annual meeting 2015 , 08.09.2015 - 12.09.2015, Freudenstadt. Sep-2015.
  10. M. Beck, G. Seitz, H. Class, and R. Helmig, “A new phenomenological approach to modelling of shear failure in porous media,” NUPUS annual meeting 2015 , 08.09.2015 - 12.09.2015, Freudenstadt. Sep-2015.
  11. J. Hommel et al., “A revised model for microbially induced calcite precipitation - improvements and insights,” 7th International Conference on Porous Media & Annual Meeting - InterPore 2015, 18.05.2015 - 21.05.2015, Padua, Italy. May-2015.
  12. J. Hommel, E. Lauchnor, A. B. Cunningham, R. Helmig, A. Ebigbo, and H. Class, “Improvements in Modeling Microbially Induced Calcite Precipitation as a Leakage Mitigation Technology,” Gordon Research Seminar on Flow and Transport in Permeable Media 2014, 05.07.2014 - 06.07.2014, Lewiston, Maine, USA. Jul-2014.
  13. M. Beck, M. Darcis, H. Class, and R. Helmig, “Spatial model coupling - an efficient scheme to combine hydraulic and geomechanic simulations,” Gordon Research Conference on Flow and Transport in Permeable Media 2014, 06.07.2014 - 11.07.2014, Lewiston, Maine, USA. Jul-2014.
  14. J. Hommel, E. Lauchnor, A. B. Cunningham, R. Helmig, A. Ebigbo, and H. Class, “Improvements in Modeling Microbially Induced Calcite Precipitation as a Leakage Mitigation Technology,” Gordon Research Conference on Flow and Transport in Permeable Media 2014, 06.07.2014 - 11.07.2014, Lewiston, Maine, USA. Jul-2014.
  15. J. Hommel, E. Lauchnor, A. B. Cunningham, R. Helmig, A. Ebigbo, and H. Class, “Estimation of uncertain parameters to improve modeling of Microbially Induced Calcite Precipitation,” European Geoscience Union General Assembly 2014, 28.04.2014 - 02.05.2014, Vienna, Austria. May-2014.
  16. J. Hommel, A. B. Cunningham, R. Helmig, A. Ebigbo, and H. Class, “Estimation of uncertain parameters of the biomineralization model by inverse modeling,” NUPUS annual meeting 2014, 16.03.2014 - 19.03.2014, Freudenstadt. Mar-2014.
  17. H. Class et al., “Dumux: Dune for Multi-Phase, Component, Scale, Physics, ... Flow and Transport in Porous Media,” NumPor Annual Meeting 2014, 02.03.2014 - 03.03.2014, KAUST, Kingdom of Saudi Arabia. Mar-2014.
  18. S. Kleinknecht, J. Braun, and H. Class, “Migration and Retention of a Heavy NAPL Vapor in the Unsaturated Zone,” 8th NUPUS Meeting. Mar-2014.
  19. S. Oladyshkin, P. Schröder, H. Class, and W. Nowak, “Chaos Expansion Based Bootstrap Filter To Calibrate CO2 Injection,” EGU General Assembly, 07.04.2013 - 11.04.2013, Vienna, Austria, vol. Vol.15. Apr-2013.
  20. J. Hommel, A. B. Cunningham, R. Helmig, A. Ebigbo, and H. Class, “Numerical investigation of microbially induced calcite precipitation as leakage mitigation technology,” NUPUS annual Meeting 17-20 March 2013, 17.03.2013 - 20.03.2013, Freudenstadt. Mar-2013.
  21. J. Hommel, A. B. Cunningham, A. Ebigbo, R. Helmig, and H. Class, “Numerical investigation of microbially induced calcite precipitation as leakage mitigation technology,” NUPUS-Conference, 30.09.2013 - 02.10.2013, Bergen, Norway. Oct-2013.
  22. S. Oladyshkin, H. Class, R. Helmig, and W. Nowak, “Efficient Bayesian updating with particle filters based on polynomial chaos expansion for CO2 storage,” AGU Fall Meeting 2011, 05.12.2011 - 09.12.2011, San Francisco, USA. Dec-2011.
  23. S. Oladyshkin, H. Class, R. Helmig, and W. Nowak, “Modeling of underground carbon dioxide storage: data-driven robust design and probabilistic risk assessment,” SimTech 2011 - International Conference on Simulation Technology 2011, 14.06.2011 - 17.06.2011, Stuttgart. Jun-2011.
  24. L. Walter, H. Class, S. Oladyshkin, B. Flemisch, and R. Helmig, “Influence of Dirichlet boundary conditions on risk assessment for CO2 storage in geological formations,” SimTech 2011 - International Conference on Simulation Technology 2011, 14.06.2011 - 17.06.2011, Stuttgart. Jun-2011.
  25. L. Walter, S. Oladyshkin, H. Class, M. Darcis, and R. Helmig, “A study on pressure evolution in a sand channel system during CO2 injection,” Greenhouse Gas Control Technologies (GHGT10), 19.09.2010 - 23.09.2010, Amsterdam, The Netherlands. Sep-2010.
  26. K. Mosthaf, H. Class, B. Flemisch, R. Helmig, T. Leijnse, and I. Rybak, “Multi-component modeling of porous-media flow coupled with free flow,” European Geosciences Union (EGU) - General Assembly, 20.04.2009 - 24.04.2009, Wien, Österreich. Apr-2009.
  27. M. Darcis, H. Class, and B. Flemisch, “Coupling Models of Different Complexity for the Simulation of CO2 Storage in Saline Aquifers,” 9th International Conference on Greenhouse Gas Control Technologies (GHGT9), 16.11.2008 - 20.11.2008, Washington DC, USA. Dec-2008.
  28. A. Winkler, H. Class, and R. Helmig, “An Efficient Solution Technique for the Numerical Simulation of Thermally Enhanced Soil Vapour Extraction,” International Groundwater Symposium: “Bridging the Gap between Measurement and Modeling in Heterogeneous Media”, 25.03.2002 - 28.03.2002, Berkeley, USA. Mar-2002.

talks

  1. H. Class, L. Walter, M. Darcis, A. Ebigbo, and B. Flemisch, “Simulation-based concepts for the evaluation of risk scenarios associated with geological storage of carbon dioxide,” Kolloquium Wasserwesen, TU Berlin, 05.05.2011, Berlin. May-2011.
  2. H. Class, M. Darcis, L. Walter, and T. Kempka, “Coupling models of different complexity on different spatial and temporal scales for simulating CO2 storage scenarios,” Rencontres Scientifiques, High Performance Computing for CO2 Geological Storage, 14.06.2010 - 16.06.2010, Paris, France. Jun-2010.
  3. H. Class, “Predictive modelling? �On matching arrival times and pressure data in Ketzin,” Norwegian-German workshop on Geological Storage of CO2, 01.06.2010 - 02.06.2010, Potsdam. Jun-2010.
  4. H. Class, M. Darcis, and L. Walter, “Coupled models for approaching the large scales in simulating CO2 storage in geological formations,” International Workshop on Coupled Models in Energy, Hydrological and Climate Research, 08.10.2009 - 09.10.2009, Berlin. Oct-2009.
  5. H. Class et al., “Intercomparison of codes and models - How can we improve reliability and understanding of model predictions for CO2 storage?,” Workshop on Modelling and Risk Assessment of Geological Storage of CO2, 03.08.2009 - 07.08.2009, Longyearbyen, Svalbard. Aug-2009.
  6. H. Class, “Strömungen durch poröse Medien und in komplexen Strukturen - Beispiele und Konzepte zur Kopplung von Modellierungsansätzen.” Jan-2009.
  7. H. Class, A. Ebigbo, A. Kopp, and R. Helmig, “Numerical Investigation of CO2 Sequestration in Geological Formations - Problem-Oriented Benchmarks,” Geotechnologien Statusseminar, 20.10.2008 - 21.10.2008, Stuttgart, Haus der Wirtschaft. Oct-2008.
  8. H. Class, “Numerical Models for Carbon Dioxide Storage in Geological Formations,” Workshop on Numerical Models for Carbon Dioxide Storage in Geological Formations, 02.04.2008 - 04.04.2008, Stuttgart. Apr-2008.
  9. H. Class, A. Ebigbo, R. Helmig, and M. Darcis, “Numerical Investigation of CO2 Sequestration in Geological Formations - Problem-Oriented Benchmarks,” Geotechnologien Statusseminar, 15.11.2007 - 16.11.2007, Hamburg. Nov-2007.
  10. H. Class, A. Kopp, and A. Ebigbo, “Modeling of CO2 storage in geological formations,” IAHR Stuttgart Student Chapter Colloquium 2007, 31.10.2007 - 31.10.2007, Stuttgart. Oct-2007.
  11. H. Class, A. Ebigbo, A. Kopp, and R. Helmig, “Numerical modeling of CO2 storage in geological formations - recent developments and challenges,” 1. French-German Symposium on Geological Storage of CO2, 21.06.2007 - 22.06.2007, Potsdam. Jun-2007.
  12. H. Class, A. Ebigbo, A. Kopp, and R. Helmig, “Reliability of numerical models for simulating CO2 storage in deep geological formations,” Deutsche Geophysikalische Gesellschaft - Jahrestagung, 26.03.2007 - 29.03.2007, Aachen. Mar-2007.
  13. H. Class, “Models for Non-Isothermal Compositional Gas-Liquid Flow and Transport in Porous Media,” Selected Topics and International Network Lectures - Seminar Lehrstuhl für Hydromechanik und Hydrosystemmodellierung, 12.02.2007 - 13.02.2007, Stuttgart. Feb-2007.
  14. H. Class and A. Ebigbo, “Numerical investigation of CO2 sequestration in geological formations - problem-oriented benchmarks,” Geotechnologien Statusseminar, 22.11.2005 - 23.11.2005, Hannover. Nov-2006.
  15. M. Kühn, T. Kempka, and H. Class, “Development and Evaluation of Innovative Strategies for Sequestration and Permanent Immobilisation of CO2 in Geological Formations,” Geotechnologien Statusseminar, 21.11.2006 - 22.11.2006, Freiberg. Nov-2006.
  16. H. Class, A. Bielinski, and S. O. Ochs, “Applications of non-isothermal multiphase multicomponent models for flow and transport in porous media,” Progress in Industrial Mathematics at ECMI 2004, 21.06.2004 - 25.06.2004, Eindhoven University of Technology. Jun-2004.
  17. H. Class and A. Bielinski, “Numerical modeling of nonisothermal multiphase multicomponent processes: General concepts, basic assumptions and some applications,” Workshop on Aquifer Storage of CO2, 06.11.2003 - 07.11.2003, University of Bergen, Norway. Nov-2003.
  18. H. Class and M. Acosta, “Numerical modelling of non-isothermal multiphase multicomponent processes in porous media: 1. General concepts, basic assumptions, and example applications 2. The model concept applied to describe the processes in the cathode diffusion layer of a PEM-fuel cell,” MACSI-Net Working Group 14: “Filtration Problems in porous media and paper manufacturing” (Workshop 2003), 21.11.2003 - 22.11.2003, Universität Stuttgart. Nov-2003.

supervised student assignements

  1. Experimentelle Visualisierung von Konvektion durch in Wasser gelöstes CO2. (2018). Universität Stuttgart.
  2. Steam Assisted Gravity Drainage - Comparison of continuous and cyclic injection on field and laboratory scale. (2015). (Diplomarbeit). Universität Stuttgart, Institut für Wasser- und Umweltsystemmodellierung.
  3. Effects of pH Control Techniques on Transport of Zero-Valent Iron Nanoparticles in an Aquifer. (2012). (Master’s Thesis).
  4. Vereinfachte Methoden zur Flutwellenabschätzung. (2011). (Bachelorarbeit). Universität Stuttgart, Institut für Wasserbau.
  5. Steam Injection Technique for In Situ Remediation of Chlorinated Hydrocarbons from Low Permeable Saturated Zones - Experiment and Numerical Approach. (2011). (Diplomarbeit). Universität Stuttgart, Institut für Wasserbau.
  6. Numerical Investigations of Flow through Fractured Porous Media. (2007). (Masterthesis).
  7. Erarbeitung und Implementierung eines Modellkonzepts zur Simulation von Strömungs- und Transportprozessen im menschlichen Gehirn. (2007). (Diplomarbeit). Universität Stuttgart, Institut für Wasserbau.
  8. Entwicklung und Implementierung eines numerischen Modellkonzepts zur Simulation von Alkoholspülungsprozessen in DNAPL-kontaminierten Grundwasserleitern. (2005). (Diplomarbeit). Stuttgart, Institut für Wasserbau.
  9. Numerical Modeling of Methane Adsorption and Transport Processes in Mined Areas. (2005). (Masterthesis).
  10. Numerische Modellierung von Strömungs- und Transportvorgängen für Mehrphasen-Mehrkomponenten-Systeme in geklüftet porösen Medien. (2001). (Diplomarbeit). Technische Universität Braunschweig, Institut für ComputerAnwendungen im Bauingenieurwesen.
  11. Skalenbetrachtungen zur Modellierung von Salzwasserintrusionsprozessen. (2000). (Studienarbeit). Technische Universität Braunschweig, Institut für ComputerAnwendungen im Bauingenieurwesen.
  12. Unterschiedliche Raumdiskretisierungsansätze zur numerischen Modellierung nichtisothermer Dreiphasen-Dreikomponentenströmungen in porösen Medien. (1999). (Diplomarbeit). Technische Universität Braunschweig, Institut für ComputerAnwendungen im Bauingenieurwesen.
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