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SYMS: Symposium Modern developments in multiphysics materials simulations

SYMS 3: Modern developments in multiphysics materials simulations III

SYMS 3.10: Vortrag

Freitag, 29. Februar 2008, 12:30–12:45, A 053

A Lattice-Boltzmann Model to simulate the growth of three dimensional microstructures under the influence of fluid flow — •Marcus Jainta, Michael Selzer, and Britta Nestler — Institute of Computational Engineering, Karlsruhe University of Applied Sciences

The effect of fluid flow on crystal growth structures is a phenomenon with particular relevance in three dimensions where solute is transported in the spatial domain and around the growing crystals. From experiments, it is well known that fluid flow dramatically alters the solidification structure during a casting process. The presence of flow admits the possibility of instabilities due to the flow itself, in addition to the well known morphological instabilities found in crystal growth. Hence, flow has an important influence on the process conditions and on the resulting material properties during the solidification from a melt. A Lattice-Boltzmann model for fluid flow is formulated and coupled with a phase-field model for multicomponent and multiphase material systems. The influence of convection on the growth process is modelled by introducing an advective term in the concentration diffusion equations. The model can be applied to multiple liquid phases with different viscosities. We discuss the numerical method and apply the parallel solver to investigate the effect of a flow field on the evolution of dendritic and eutectic solidification microstructures in two and three dimensions.