Scientific Homepage of Dr. Juergen Geiser

Research Interests
Numerical Anlysis. Computational Analysis. Partial Differential Equations. Decomposition and Discretisation Methods for Hyperbolic and Parabolic Equations. Optimisation. Scientific computing. Interface Analysis

Next Conferences

• Sommer School (Numerical Methods for magnetic fusion), Garching, Germany, 8-12 September, 2012.

• NUMDIFF-13, Halle Germany, 10-14 September, 2012.

• 7th M.I.T. Conference on Computational Fluid and Solid Mechanics, June 12 - 14, 2013.

Quick-Links

• Contact Address
• Curriculum Vitae
• Projects
• Publications
• Talks and Presentations
• Organized Minisymposiums
• Teaching Experience
• Books
• Fellowships
• Memberships
• Editor and Referee

Curriculum Vitae

• 1993 - 1999

  Graduate-studies in mathematics and computer science, University Stuttgart, Germany, Master Degree.

• 1999 - 2003

  Post-Graduate-studies in mathematics, University Heidelberg, Germany, PhD Degree.

• 02.2004 - 05.2004

  Visiting Professor, Adjoint work with Prof. Dr. R. Lazorov and Prof. Dr. R. Ewing:
  Discontinuous Galerkin Methods and Approximation Theory, Institute for Scientific Computing, Texas A& M University, College Station, USA.

• 06.2004 - 08.2004

  Research Assistant, Adjoint work with Prof. Dr. G. Wittum and Dr. P. Frolkovic:
  Discretisation methods for Parabolic and Hyperbolic Equations, Interdisciplinary Center for Scientific Computing, University Heidelberg , Germany.

• 08.2004 - 01.2006

  Research Assistant,
  Adjoint work with Prof. Dr. J. Sprekels and Dr. O. Klein :
  Modelling and Simulation of Sublimation Growth of SiC Bulk Single Crystal, WIAS, Weierstrass Institute for Applied Analysis and Stochastics, Berlin, Germany.

• 02.2006 - 01.2007

  Reseacher and Lecturer,
  Adjoint work with Prof. Dr. C.Carstensen and Prof. PhD. A.Griewank:
  Modelling, Simulation and Numerical Analysis of Partial Differential Equations, Humboldt Universitaet zu Berlin, Germany.

• 02.2007 - 12.2007

  Kalkhofen-Rose Fellow,
  Research work for the Book and Thesis:
  Decomposition Methods: Theory and Applications, Fellowship of the Kalkhofen-Rose Foundation, Mainz, Germany.

• 01.2008 - 12.2010

  Reseacher,
  Adjoint work with Prof. Dr. V.Buck, Prof. Dr. A.Heinzelmann, Duisburg (Metal-Bip Project):
  Nano-coated metal for bipolar plates of PEFC: Modelling and Simulation of multi-scale equations, BMBF-Project : Humboldt Universitaet zu Berlin, Germany.

• 01.2011 - 06.2011

  Reseacher,
  Adjoint work with Prof. Dr. V.Buck and Dr. Fenker (Metal-Bip Project):
  Nano-coated metal for bipolar plates of PEFC: Modelling and Simulation of multi-scale equations, Extension of the BMBF-Project : Humboldt Universitaet zu Berlin, Germany. Supported by private funds and industrial funds.

• 09.2011 - 08.2014

  Reseacher,
  Adjoint work with Prof. Ralf Schneider, University of Greifswald:
  Simulation of Ion Thrusters, Coupling Analysis, PIC, Error Estimates, Multiscale Analysis.
  
  
  

Projects

• Plasma processes: Self Consistent Simulations, PIC and MC Simulations, Adaptivity and Parallelisation.
  2011-2014 : Project, Start September 2011, Germany.

  Analysis, Modelling and Simulation of plasma modell and their model equations with Transport, Scattering, Absorption and Electric Field operators.

• Metalbip - Nano implanted, metallic bipolar plates for PEFC
  2007-2010 : Humboldt Univerity of Berlin, Germany.

  Simulation and Modelling of low-temperature low-pressure plasma modell of a CVD (chemical vapor deposition) process. In the last years, due to the research in producing high temperature films by depositing of low pressurs processes have increased. We use a model for low temperature and low pressure plasma, that can be used to implant or deposite thin layers of important materials. The applications are used in the production so called metallic bipolar plates.

• Numerical Simulation and Control of Sublimation Growth of SiC Bulk Single Crystals
  2004-2005 : Weierstrass Institute, Berlin, Germany.

  Simulation and Modelling of Sublimation growth of SiC bulk single crystals via physical vapor transport (PVT), also known as the modified Lely method. Design of solver and discretisation methods for the heat transport euations.

• R3T : Radioactive-Retardation-Reaction-Transport-Program for the Simulation of radioactive waste disposal.
  2000-2003 : University of Heidelberg, Germany.

  Development of a Software-package for a simulation of transport and reaction processes in porous media with an underlying groundwater-flow. The analysing for discretisation-methods for convection-dominant equations and the embedding of analytical methods for the reaction-equation are developped.

• Multi-physical and multi-dimensional computations in transport- and reaction-equations.
  January 2004 - May 2004 : College Station, Texas A & M University, USA

  Application and theoretical results for multiple sources in the transport- and reaction-equations as a model-equation for radioactive waste-disposals. We compare different applications. The theory is an attempt to embed analytical test-functions in the discretisation methods.

Publications

Theses

1. J. Geiser, Discretisation methods for systems of convective-diffusive-dispersive-reactive equations and applications. Doctor Thesis, University Heidelberg, Germany, 2004.
2. J. Geiser, An examination of the ocillation at the sound-board on a cembalo : Reduction into 2 space-dimensions. Diploma thesis, Stuttgart, Germany, 1998.
   
   

Theses in progress

1. J. Geiser, Modelling and Simulation of Engineering Problems: Mathematical Splitting Schemes. Habiltation Thesis, submitted December 2011.
   
   

Articles in Refereed Scientific Journals (Start October 2011)

1. J. Geiser, Iterative Operator Splitting Methods for Solving Time-Dependent Problems. Applied Mathematics Letters, Elsevier, North Holland, accepted October 2011.
   
   
2. J. Geiser and St. Guettel, Coupling methods for Heat-Transfer and Heat-Flow: Operator Splitting and the Parareal Algorithm. Journal of Mathematical Analysis and Applications, Elsevier, North Holland, accepted October 2011 (online available: http://dx.doi.org/10.1016/j.jmaa.2011.10.030) .
   
   
3. J. Geiser, Iterative operator - splitting methods with embedded discretization schemes. Communications in Mathematics and Applications, RGN Publications, Delhi, India, Vol.3, Number 2, 2012.
   
   
4. J. Geiser, Operator Splitting Methods combined with Multi-grid Methods. Journal of Modern Mathematics Frontier (JMMF), The World Academic Publishing, Hong Kong, China, accepted May 2012.
   
   
5. J. Geiser, Splitting Approach to coupled Navier Stokes and Molecular Dynamics Simulation. Journal of Computations and Modelling (JCoMod), Communications in Mathematics and Applications, International Scientific Press, Athens, Greece, accepted May 2012.
   
   

Preprints in Arxiv: http://arxiv.org (Start October 2011)

1. J. Geiser: Multi-product expansion for Nonlinear Differential Equations, arXiv:1110.5449v1 (http://arxiv.org/abs/1110.5449), October 2011.

2. J. Geiser, Julia Duras, Ralf Schneider, Konstantin Matyash, David Tskhakaya and O. Kalentyev: Adaptive Particle in Cell: Balanced Discretization and weighted Shape functions, arXiv:1112.1203 (http://arxiv.org/abs/1112.1203), December 2011.

3. J. Geiser and K.F. Lueskow: Splitting methods for Levitron Problems, arXiv:1201.1736 (http://arxiv.org/abs/1201.1736), January 2012.

4. J. Geiser and Th. Zacher: Multiscale Splitting method for Boltzmann-Poisson Equation: Application for Dynamic of Electrons, arXiv:1201.2522 (http://arxiv.org/abs/1201.2522), January 2012.

5. J. Geiser: Multiscale methods for Levitron Problems: Theory and Applications, arXiv:1201.5169 (http://arxiv.org/abs/1202.5169), February 2012 (submitted to 7th MIT conference 2013).

6. J. Geiser: Embedded Zassenhaus Expansion to Operator Splitting Schemes: Theory and Application in Fluid Dynamics, arXiv:1204.0380 (http://arxiv.org/abs/1204.0380), April 2012 (submitted to a numerical journal).

7. J. Geiser and Th. Zacher: Multiple Iterative Splitting method for Higher order and Integro-differental equations, arXiv:1204.3380 (http://arxiv.org/abs/1204.3380), April 2012.

8. J. Geiser: Simulation of a Heat Transfer in Porous Media, arXiv:1205.2449 (http://arxiv.org/abs/1205.2449), May 2012.