#### Vol. 4, No. 9, 2009

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Remarks on the accuracy of algorithms for motion by mean curvature in bounded domains

### Simon Cox and Gennady Mishuris

Vol. 4 (2009), No. 9, 1555–1572
##### Abstract

Simulations of motion by mean curvature in bounded domains, with applications to bubble motion and grain growth, rely upon boundary conditions that are not necessarily compatible with the equation of motion. Three closed form solutions for the problem exist, governing translation, rotation, and expansion of a single interface, providing the only benchmarks for algorithm verification. We derive new identities for the translation solution. Then we estimate the accuracy of a straightforward algorithm to recover the analytical solution for different values of the velocity $V$ given along the boundary. As expected, for large $V$ the error can reach unacceptable levels especially near the boundary. We discuss factors influencing the accuracy and propose a simple modification of the algorithm which improves the computational accuracy.

##### Keywords
motion by mean curvature, grain growth, foam rheology, algorithms, measures of accuracy