Asymptotic analysis of the RS-IMEX scheme for the shallow water equations in one space dimension

Asymptotic analysis of the RS-IMEX scheme for the shallow water equations in one space dimension
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一维浅水方程RS-IMEX格式的渐近分析

DOI:
10.1051/m2an/2019005
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发表时间:
2019
期刊:
ESAIM: Mathematical Modelling and Numerical Analysis
影响因子:
--
通讯作者:
Hamed Zakerzadeh
Hamed Zakerzadeh
中科院分区:
--
文献类型:
--
作者:
Hamed Zakerzadeh

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我们介绍和分析所谓的参考解隐显格式作为一种通量分裂方法的奇异摄动系统的平衡法。RS-IMEX方案的底线是使用通量函数和源项在参考解(通常是渐近极限或平衡解)周围的泰勒展开,以将通量和源分解为刚性和非刚性部分,使得所得IMEX方案是渐近保持(AP)w.r.t.奇异参数趋于零。当奇异参数为Froude数时,我们证明了一维浅水方程格式的渐近一致性、渐近稳定性、可解性和良好平衡性.我们还将研究几个测试案例,以说明计算解决方案的质量,并确认分析。
We introduce and analyse the so-called Reference Solution IMplicit-EXplicit scheme as a flux-splitting method for singularly-perturbed systems of balance laws. RS-IMEX scheme’s bottom-line is to use the Taylor expansion of the flux function and the source term around a reference solution (typically the asymptotic limit or an equilibrium solution) to decompose the flux and the source into stiff and non-stiff parts so that the resulting IMEX scheme is Asymptotic Preserving (AP) w.r.t. the singular parameter tending to zero. We prove the asymptotic consistency, asymptotic stability, solvability and well-balancing of the scheme for the case of the one-dimensional shallow water equations when the singular parameter is the Froude number. We will also study several test cases to illustrate the quality of the computed solutions and to confirm the analysis.
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