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arXiv 2009.09353math.NAcs.NA
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Cahn-Hilliard-Navier-Stokes两相不可压流模型的全解耦MSAV格式

On fully decoupled MSAV schemes for the Cahn-Hilliard-Navier-Stokes model of Two-Phase Incompressible Flows

Xiaoli Li, Jie Shen

摘要:

基于梯度方程的多标量辅助变量方法和Navier-斯托克斯方程的旋转压力修正,构造了Cahn-Hilliard-Navier-Stokes方程的一阶和二阶时间离散格式.这些格式是线性的,完全解耦的,无条件能量稳定的,并且在每个时间步只需要求解一系列常系数的椭圆型方程。我们进行了严格的误差分析的一阶计划,建立最佳的收敛速度的所有相关功能在不同的规范。我们还提供了数值实验来验证我们的理论结果。

英文摘要:

We construct first- and second-order time discretization schemes for the Cahn-Hilliard-Navier-Stokes system based on the multiple scalar auxiliary variables approach (MSAV) approach for gradient systems and (rotational) pressure-correction for Navier-Stokes equations. These schemes are linear, fully decoupled, unconditionally energy stable, and only require solving a sequence of elliptic equations with constant coefficients at each time step. We carry out a rigorous error analysis for the first-order scheme, establishing optimal convergence rate for all relevant functions in different norms. We also provide numerical experiments to verify our theoretical results.

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