arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2002.00236math.NAcs.NA
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梯度流的广义标量辅助变量法(G-SAV)

The generalized scalar auxiliary variable approach (G-SAV) for gradient flows

Qing Cheng

摘要:

本文建立了梯度流数值计算的能量稳定格式的一般框架,并发展了三种广义标量辅助变量方法(G-SAV)。基于G-SAV方法的数值格式与原始SAV格式\cite{SXY19,cheng2018multiple}对梯度流同样有效,即,在每一时间步只需要求解常系数的线性方程,可以无条件能量稳定。但G-SAV方法取消了辅助变量只能是平方根函数的定义限制。辅助变量的定义形式适用于G-SAV方法的任何可逆函数。通过对相场模型的数值计算,验证了G-SAV数值格式的有效性和准确性。

英文摘要:

We establish a general framework for developing, efficient energy stable numerical schemes for gradient flows and develop three classes of generalized scalar auxiliary variable approaches (G-SAV). Numerical schemes based on the G-SAV approaches are as efficient as the original SAV schemes \cite{SXY19,cheng2018multiple} for gradient flows, i.e., only require solving linear equations with constant coefficients at each time step, can be unconditionally energy stable. But G-SAV approaches remove the definition restriction that auxiliary variables can only be square root function. The definition form of auxiliary variable is applicable to any reversible function for G-SAV approaches . Ample numerical results for phase field models are presented to validate the effectiveness and accuracy of the proposed G-SAV numerical schemes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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