论文标题
稳定的对流艾伦 - 卡恩方程的指数时间差异方程
Stabilized exponential time differencing schemes for the convective Allen-Cahn equation
论文作者
论文摘要
对流的艾伦-CAHN方程已被广泛用于模拟许多相场模型中的多相流。作为经典艾伦 - 卡恩方程的一种广义形式,对流的艾伦·卡恩方程仍然保留了最大结合原理(MBP),因为方程与方程的时间相关解具有适当的初始和边界条件,并且始终保留了均匀的均匀键。在本文中,我们开发了有效的一阶和二阶指数时间差异(ETD)方案,并结合了线性稳定技术,以在离散设置中无条件地保留MBP。空间离散化是使用对流项的上风差方案和扩散项的中心差方案进行的,并且通过线性凸插值近似迁移率和非线性项。事实证明了对拟议方案的MBP的无条件保存,并提出了它们的收敛分析。还进行了两个维度和三个维度的各种数值实验,以验证理论结果。
The convective Allen-Cahn equation has been widely used to simulate multi-phase flows in many phase-field models. As a generalized form of the classic Allen-Cahn equation, the convective Allen-Cahn equation still preserves the maximum bound principle (MBP) in the sense that the time-dependent solution of the equation with appropriate initial and boundary conditions preserves for all time a uniform pointwise bound in absolute value. In this paper, we develop efficient first- and second-order exponential time differencing (ETD) schemes combined with the linear stabilizing technique to preserve the MBP unconditionally in the discrete setting. The space discretization is done using the upwind difference scheme for the convective term and the central difference scheme for the diffusion term, and both the mobility and nonlinear terms are approximated through the linear convex interpolation. The unconditional preservation of the MBP of the proposed schemes is proven, and their convergence analysis is presented. Various numerical experiments in two and three dimensions are also carried out to verify the theoretical results.