Dresden 2009 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 12: Poster I

DY 12.5: Poster

Dienstag, 24. März 2009, 14:30–16:30, P1A

Phase field modeling: The interaction of interfaces — •Robert Spatschek1,2, Nan Wang2, and Alain Karma21ICAMS, Ruhr-Universität Bochum — 2Northeastern University Boston

Nowadays, phase field models are an important tool for simulating the dynamics of e.g. solidification processes. Often, these models are used in the sharp or thin interface limit, where all relevant physical length scales are large in comparison to the intrinsic interface thickness, which is then used as a purely numerical parameter that does not influence the results.

In the recent time, pattern formation on the nanoscale has attracted much interest, and there the above scale separation breaks down. Interactions between interfaces are therefore an inevitable and essential new effect, raising the question to which extend they can be modeled by conventional multi-order parameter phase field models in a reliable and well-controlled way. I will demonstrate a theoretical procedure how to analyze these phase field interactions and show the limitations of the conventional models. Also, I will present a new model which overcomes these restrictions; furthermore, the influence of alloying and mechanical stress will be investigated.

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