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Sharp Interface Limit for the Allen-Cahn Equation with a Contact Angle

Date: Thursday, July 4, 2019 16:00 - 18:00
Speaker: Helmut Abels (Universit├Ąt Regensburg)
Location: Heinzel Seminar Room / Office Bldg West (I21.EG.101)
Series: Mathematics and CS Seminar
Host: Julian Fischer
Contact: WIDDMANN Sandra

We consider the sharp interface limit of the Allen-Cahn equation, when a parameter epsilon > 0 that is proportional to the thickness of the di use interface tends to zero, in a two dimensional bounded domain with Neumann boundary conditions. We prove convergence of the solutions of the Allen-Cahn equation to solutions of the sharp interface limit, which is the mean curvature ow with a 90 degree contact angle, provided the limit problem possesses a smooth solution on a certain time interval. To this end we construct a suitable approximation of the Allen-Cahn equation, using three levels of the terms in the formally matched asymptotic calculations, and estimate the dierence with the aid of a suitable spectral estimates of the linearized Allen-Cahn operator. Moreover, we will discuss recent extensions of this results e.g. to the Navier-Stokes/Allen-Cahn system or the Stokes/Cahn-Hilliard system. This is a joint-work with Maximilian Moser.
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