Regensburg 2007 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 42: Materials design II

MM 42.2: Talk

Friday, March 30, 2007, 12:45–13:00, H16

Parallel algorithms for microstructure simulations with fluid flow — •Michael Selzer and Britta Nestler — Institute for Computational Engineering, Karlsruhe University of Applied Sciences, Karlsruhe, Germany

Fluid flow has an important effect on the formation of microstructures and on the properties of materials. Our numerical method for solving the Navier-Stokes equations coupled with the microstructure model is based on a finite difference method on a staggered grid including a successive overrelaxation iteration for the pressure update. Simulations modelling the ripening process of a fine distribution of liquid droplets embedded in a fluid medium have demonstrated the necessity of developing parallel and optimized algorithms for solving the set of nonlinear partial differential equations in order to reduce computing times. The parallelization is realized by a domain decomposition using the message passing interface (MPI) library for data exchanging between computing nodes. To homogenize the load distribution, a dynamic redistribution of the domain decomposition is implemented. We apply the parallel simulator to microstructure formation processes with fluid flow and systematically analyze the computational performance depending on the configuration setup and on the optimization methods.