| Citation: |
Anass Bouchriti, Morgan Pierre, Nour Eddine Alaa. REMARKS ON THE ASYMPTOTIC BEHAVIOR OF SCALAR AUXILIARY VARIABLE (SAV) SCHEMES FOR GRADIENT-LIKE FLOWS[J]. Journal of Applied Analysis & Computation, 2020, 10(5): 2198-2219. doi: 10.11948/20190373
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REMARKS ON THE ASYMPTOTIC BEHAVIOR OF SCALAR AUXILIARY VARIABLE (SAV) SCHEMES FOR GRADIENT-LIKE FLOWS
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Abstract
We introduce a time semi-discretization of a damped wave equation by a SAV scheme with second order accuracy. The energy dissipation law is shown to hold without any restriction on the time step. We prove that any sequence generated by the scheme converges to a steady state (up to a subsequence). We notice that the steady state equation associated to the SAV scheme is a modified version of the steady state equation associated to the damped wave equation. We show that a similar result holds for a SAV fully discrete version of the Cahn-Hilliard equation and we compare numerically the two steady state equations.-
Keywords:
- Gradient flow /
- SAV schemes /
- BDF methods /
- sine-Gordon equation /
- Cahn-Hilliard equation
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References
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Anass Bouchriti, Morgan Pierre, Nour Eddine Alaa. REMARKS ON THE ASYMPTOTIC BEHAVIOR OF SCALAR AUXILIARY VARIABLE (SAV) SCHEMES FOR GRADIENT-LIKE FLOWS[J]. Journal of Applied Analysis & Computation, 2020, 10(5): 2198-2219. doi: 10.11948/20190373
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Figure 1. Convergence of
$ (u_h^{n})_n $ (left) and of the energy$ (E^n)_n $ right). -
Figure 2. Values of
$ |U^{n+1}-U^n|_\infty $ .