An unconditionally stable hybrid numerical method for the gradient flow for the high-order Modica–Mortola functional
Hyundong Kim , Zhengang Li , Xinpei Wu , Hyunho Shin , Yunjae Nam , Junseok Kim
Electronic Research Archive ›› 2025, Vol. 33 ›› Issue (10) : 6375 -6390.
This paper presents a numerically stable, time-accurate algorithm for simulating the gradient flow associated with the Modica–Mortola functional with a uniformly spaced multi-well potential. The scheme uses operator splitting; the nonlinear component is updated analytically, while the linear part is advanced by a Fourier spectral discretization. The method is unconditionally stable, preserves pointwise boundedness independently of the time step size, and attains spectral accuracy in space and first-order accuracy in time. We provide a theoretical analysis establishing unconditional stability and boundedness, and present comprehensive numerical experiments that demonstrate the accuracy and robustness of the proposed approach.
Modica–Mortola model / high-order multi-well free energy / multi-phase system / Fourier spectral approach / stable scheme
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