Session J24: GSNP Student Presentation Session and Far From Equilibrium Systems

11:15 AM–2:03 PM, Tuesday, March 22, 2005
LACC Room: 411

Sponsoring Unit: GSNP
Chair: Mark Robbins, Johns Hopkins University

Abstract ID: BAPS.2005.MAR.J24.9

Abstract: J24.00009 : Cahn-Hilliard Simulation of Anisotropic Coarsening

12:51 PM–1:03 PM

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  Jaime Wallace
  Benjamin Vollmayr-Lee
    (Bucknell University)

The influence of surface tension anisotropy on the dynamics of coarsening is studied via computer simulations. The Cahn-Hilliard equation in dimension $d=2$ is modified to include an arbitrary surface tension anisotropy. For all cases studied, we find asymptotic late-stage scaling with the growth law $L \sim t^{1/3}$ unchanged. The structure factor $S({\bf k},t)$ is binned into angular wedges, and is found to exhibit scaling collapse distinct for each wedge, indicating that the asymptotic domain structure is indeed anisotropic. The Porod tail is found to be a sensitive diagnostic, allowing for quantitative measurement of the degree of anisotropy in the domain structure.

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