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Nadja Ray

Research Associate

Announcement of a doctorate positions in RTG IntComSin

Application deadline: December 1st, 2018; further information www.uni-regensburg.de/IntComSin

Research interests

  • Multiscale modeling, upscaling, homogenization
  • Porous media applications including evolving microstructures
  • Soil microaggregates
  • Electrohydrodynamics


  • 2018 - present: Principle investigator DFG RTG 2339 IntComSin - Interfaces, Complex Structures, and Singular Limits in Continuum Mechanics, www.uni-regensburg.de/IntComSin
  • 2016 - 2017: Principle investigator DAAD PPP Norway: Upscaling Evolving Microstructures and its Application
  • 2015 - present: Principle investigator DFG RU 2179: MadSoil – Microaggregates: Formation and turnover of the structural building blocks of soils, PM: Mechanistic Modeling of the Formation and Consolidation of Soil Microaggregates, www.madsoil.uni-jena.de/



Papers and Proceedings

  • A. Rupp, K.-U. Totsche, A. Prechtel, and N.Ray: "Discrete-continuum multiphase model for structure formation in soils including electrostatic effects", accepted in Frontiers in Environmental Sciences, 2018.
  • N. Ray, R. Schulz, A. Rupp, and P. Knabner: "Old and New Approaches Predicting the Diffusion
    in Porous Media", Transport in Porous Media, 2018.
  • K. U. Totsche, W. Amelung, M. H. Gerzabek, G. Guggenberger; E. Klumpp, C. Knief, E. Lehndorff, R. Mikutta, S. Peth, A. Prechtel, N. Ray, I. Kögel-Knabner: "Microaggregates in soils", Journal of Plant Nutrition and Soil Science 181 (1), 2018.
  • N. Ray, A. Rupp, and A. Prechtel: "Discrete-continuum multiscale model for transport, biofilm development and solid restructuring in porous media", Advances in Water Resources 107, 2017.
  • R. Schulz, N. Ray, F. Frank, H. Mahato, and P. Knabner: "Strong sovability up to clogging of an effective diffusion-precipitation model in an evolving porous medium", European Journal of Applied Mathematics 28 (2), 2017.
  • N. Ray, T. Elbinger, and P. Knabner: "Upscaling flow and transport in an evolving porous medium with general interaction potential", SIAM Journal of Applied Mathematics 75 (5), 2015.
  • N. Ray, T. van Noorden, F. Radu, W. Friess, and P. Knabner: "Drug release from collagen matrices including an evolving microstructure", ZAMM—Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik 93 (10-11), 2013.
  • M. Herz, N. Ray, and P. Knabner: "Existence and uniqueness of a global weak solution of a Darcy-Nernst-Planck-Poisson system", GAMM Mitteilungen 35(2), 2012.
  • N. Ray, T. van Noorden, F. Frank, and P. Knabner: "Colloid and Fluid Dynamics in Porous Media including an Evolving Microstructure", Transport in Porous Media 95(3), 2012.
  • N. Ray, A. Muntean,  and P. Knabner: "Rigorous homogenization of a Stokes-Nernst-Planck-Poisson system", Journal of Mathematical Analysis and Applications 390, 2012.
  • F. Frank, N. Ray, and P. Knabner: "Numerical Investigation of a Homogenized Stokes-Nernst-Planck-Poisson Problem", Computation and Visualization 14(8), 2011.
  • N. Ray, F. Radu, and P. Knabner: "Drug release from collagen matrices and transport phenomena in porous media including an evolving microstructure", Proceedings of the 11th International Conference on Mathematical Methods in Science and Engineering, Alicante 26-30 June 2011.


  • N. Ray, J. Oberlander, and P. Knabner: "Numerical investigation of a fully coupled micro-macro model for mineral dissolution and precipitation." Preprint Series Angewandte Mathematik 400, ISSN: 2194-5127, 2018.
  • N. Ray and R. Schulz: "Derivation of an effective dispersion model for electroosmotic flow involving free boundaries in a thin strip", Preprint Series Angewandte Mathematik 398, ISSN: 2194-5127, 2017.
  • N. Ray, R. Schulz, A. Rupp, and P. Knabner:"Past and present approaches to calculate hydrodynamic parameters in evolving porous media", Preprint Series Angewandte Mathematik 395, ISSN: 2194-5127, 2016.


  • Colloid and Fluid Dynamics in Porous Media - Modeling and Analysis, Dissertation thesis, 2013, supervisor: Prof. Dr. P. Knabner
  • Asymptotik eines Phasenfeldmodells für Phasenübergänge mit Konvektion (in German), Diploma thesis, 2008, supervisor: Prof. Dr. C. Eck