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• W4283803604 abstract "The two-step backward differential formula (BDF2) with unequal time-steps is applied to construct an energy stable convex-splitting scheme for the Cahn–Hilliard model. We focus on the numerical influences of time-step variations by using the recent theoretical framework with the discrete orthogonal convolution kernels. Some novel discrete convolution embedding inequalities with respect to the orthogonal convolution kernels are developed such that a concise $$L^2$$ norm error estimate is established at the first time under an updated step-ratio restriction $$0 <r_k:=tau _k/tau _{k-1}le r_{mathrm {user}}$$ , where $$r_{mathrm {user}}$$ can be chosen by the user such that $$r_{mathrm {user}}<4.864$$ . The stabilized convex-splitting BDF2 scheme is shown to be mesh-robustly convergent in the sense that the convergence constant (prefactor) in the error estimate is independent of the adjoint time-step ratios. The suggested method is proved to preserve a modified energy dissipation law at the discrete levels if $$0<r_kle r_{mathrm {user}}$$ , such that it is mesh-robustly stable in an energy norm. On the basis of ample tests on random time meshes, a useful adaptive time-stepping strategy is applied to efficiently capture the multi-scale behaviors and to accelerate the long-time simulation approaching the steady state." @default.
• W4283803604 created "2022-07-05" @default.
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• W4283803604 date "2022-07-04" @default.
• W4283803604 modified "2023-09-28" @default.
• W4283803604 title "Mesh-Robustness of an Energy Stable BDF2 Scheme with Variable Steps for the Cahn–Hilliard Model" @default.
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• W4283803604 doi "https://doi.org/10.1007/s10915-022-01861-4" @default.
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