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| Zeit: | Freitag, 11.5.2001, 11:45 Uhr |
| Ort: | Reichenhainer Straße 70, B 202 |
| Vortragender: | Prof. Peter Bastian (Uni Heidelberg) |
| Thema: | Parallel simulation of multiphase flow in porous media |
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The flow of two (or more) immiscible fluids, e.g. water and oil, in a porous medium is described by a set of strongly coupled nonlinear and time-dependent partial differential equations. Porous media in practice contain heterogeneities on many different length scales. The simulation of such flows requires fine meshes in possibly complex geometries, e.g. when fractures are present in the porous medium. We developed a simulator that is able to handle several different models ranging from single phase flow and transport to multiphase/ multicomponent flow with phase exchange. The simulator is based on the general PDE solver toolbox UG (also developed in our group) which provides a flexible unstructured mesh data structure in 2 and 3 space dimensions as well as adaptive local mesh refinement. The multiphase systems are solved fully implicit and fully coupled with a finite volume technique. For the solution of the nonlinear equations Newton-Multigrid methods are employed which have been parallelized in the underlying UG software in an efficient and portable way. Numerical examples will be presented that assess the performance of the method for water-air and water-oil systems including entry pressure effects and fractures as well as speedup results for parallel computations. | |
| Das Seminar wird von Prof. Meyer geleitet. Interessenten sind herzlich eingeladen. | |