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Stability of the semi-implicit method for the Cahn-Hilliard equation with logarithmic potentials

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arxiv 2106.09903 v1 pith:4RFSARIA submitted 2021-06-18 math.NA cs.NAmath.AP

Stability of the semi-implicit method for the Cahn-Hilliard equation with logarithmic potentials

classification math.NA cs.NAmath.AP
keywords semi-implicitcahn-hilliardequationpotentialslogarithmicschemestabilityterm
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We consider the two-dimensional Cahn-Hilliard equation with logarithmic potentials and periodic boundary conditions. We employ the standard semi-implicit numerical scheme which treats the linear fourth-order dissipation term implicitly and the nonlinear term explicitly. Under natural constraints on the time step we prove strict phase separation and energy stability of the semi-implicit scheme. This appears to be the first rigorous result for the semi-implicit discretization of the Cahn-Hilliard equation with singular potentials.

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