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Project D8


High resolution parallel simulation of variably saturated flow with adaptive mesh refinement

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Research Area:
Hydrology; high-performance computing


project d8

The amount of subsurface flow data that is obtained from measurements is growing exceedingly fast; in fact, several novel ways of measuring such data are contributed by the TR32 collaborative project. This opens the opportunity of developing highly resolved computational models of subsurface flow and to validate them with experimental data. In practice however, assuming a uniform computational mesh at the sub-meter or even centimeter scale, computation tends to become prohibitively slow since each doubling of resolution in space-time necessarily incurs at least a 16x increase in computational cost. One possible remedy is to increase resolution only where needed by way of adaptive mesh refinement (AMR).

The ParFlow code is parallelized, but currently restricted to using a uniform mesh. Due to the irregular data dependencies and communication patterns that are induced by AMR, its efficient integration is a challenging task. While a development of suitable AMR techniques from scratch would exceed the scope of a single project, there exists a collection of scalable algorithms for parallel mesh generation and modification, namely the freely available p4est software, which divides the mesh effectively using tree-based concepts (see picture). The central objective of this research project is thus to integrate ParFlow with p4est, and to add AMR capabilities to the finite element discretization and numerical solvers.

To enable finely discretized parameter and flow fields, a strong focus must be placed on parallel scalability of both algorithms and implementation. This applies to both the adaptive discretization and the design of multilevel preconditioners.


Cooperation partner:
n/a

3 Member(s):

Carsten Burstedde

Prof. Dr.
Carsten Burstedde
Principal Investigator
in D8

University of Bonn
Institute for Numerical Simulation

Wegelerstr. 6
53115 Bonn
Germany

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+49 (0)228 73 3165
+49 (0)228 73 7527
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burstedde@ins.uni-bonn.de

 

 

Stefan Kollet

Prof. Dr.
Stefan Kollet
Principal Investigator
in D7, D8, Z4

University of Bonn
Meteorological Institute

Auf dem Hügel 20
53121 Bonn
Germany

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+49 (0)228 73 5195
+49 (0)228 73 5188
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stefan.kollet@uni-bonn.de

 

 

Jose A. Fonseca

M.Sc.
Jose A. Fonseca
Ph.D. Student
in D8

University of Bonn
Institute for Numerical Simulation

Wegelerstr. 6
53115 Bonn
Germany

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+49 (0)228 73 60458
+49 (0)228 73 7527
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fonseca@ins.uni-bonn.de

 

 


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