Interface instability under forced displacements

Reference:

De Masi, A., Dirr, N. and Presutti, E., 2006. Interface instability under forced displacements. Annales Henri Poincare, 7 (3), pp. 471-511.

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Abstract

By applying linear response theory and the Onsager principle, the power (per unit area) needed to make a planar interface move with velocity V is found to be equal to V-2/ mu, mu a mobility coefficient. To verify such a law, we study a one dimensional model where the interface is the stationary solution of a non local evolution equation, called an instanton. We then assign a penalty functional to orbits which deviate from solutions of the evolution equation and study the optimal way to displace the instanton. We find that the minimal penalty has the expression V-2/ mu only when V is small enough. Past a critical speed, there appear nucleations of the other phase ahead of the front, their number and location are identified in terms of the imposed speed.

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