Computation of solidification problems with hydrodynamic convection resolving energetic anisotropies at the microscale quantitatively |
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Authors: | R Siquieri H Emmerich M Jurgk |
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Institution: | 1.Computational Materials Engineering, Center for Computational Engineering Science, Institute of Minerals Engineering, RWTH Aachen University,Aachen,Germany;2.Max-Planck-Institute for Physics of Complex Systems,Dresden,Germany |
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Abstract: | In this work we propose a new numerical approach to solve the solidification of
microstructures from a pure melt including hydrodynamic effects in the molten phase. The model is based on the
classical sharp-interface model, i.e the solid–liquid interface is tracked and
latent heat is released. An enhanced scheme is employed to solve fluid flow in
the melt. The no-slip condition is applied on the interface by enforcing the
velocities in the solid phase to be zero. The morphology evolution of the
solidifying crystal microstructure under the influence of convection is compared
with an existing morphology diagram for pure diffusion controlled growth (see
Brener et al. 1]). The peculiarity of our approach is that it
models the physical anisotropies along the solid–liquid interface with high
accuracy. This allows us to report changes in the
morphology diagram given by Brener et al. 1] due to the influence of
forced flow. Moreover, we present some results on the scaling of the dendritic
tip in such cases. |
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Keywords: | |
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