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Preprint 41-2014

Anisotropy in wavelet based phase field models

Source file is available as :   Portable Document Format (PDF)

Author(s) : Maciek Korzec , Andreas Münch , Endre Süli , Barbara Wagner

Preprint series of the Institute of Mathematics, Technische Universität Berlin
Preprint 41-2014

MSC 2000

34E13 Multiple scale methods
74N20 Dynamics of phase boundaries

Abstract :
Anisotropy is an essential feature of phase-field models, in particular when describing the evolution of microstructures in solids. The symmetries of the crystalline phases are reflected in the interfacial energy by introducing corresponding directional dependencies in the gradient energy coefficients, which multiply the highest order derivative in the phase-field model. This paper instead considers an alternative approach, where the anisotropic gradient energy terms are replaced by a wavelet analogue that is intrinsically anisotropic and linear. In our studies we focus on the classical coupled temperature - Ginzburg-Landau type phase-field model for dendritic growth. For the resulting derivative-free wavelet analogue existence, uniqueness and continuous dependence on initial data for weak solutions is proved. The ability to capture dendritic growth similar to the results obtained from classical models is investigated numerically.

Keywords : Phase-field model, wavelets, sharp-interface model, free boundaries

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