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Modified Predictor-Corrector WAF Method for the Shallow Water Equations with Source Terms

机译:带有源项的浅水方程的修正的预测校正WAF方法

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摘要

A modified predictor-corrector scheme combining with the depth gradient method (DGM) and the weighted average flux (WAF) method has been presented to solve the one-dimensional shallow water equations with source terms. Approximate solutions in the predictor step are obtained by the DGM with piecewise-linear reconstructions in each cell volume. The source terms can then be calculated directly by these predicted values at the corresponding half-time step. In the corrector step, the TVD version of the WAF method is applied to calculate the numerical fluxes at the same half-time step for each cell face. The accuracy of numerical solutions is shown by applying the method to solve various test cases in both steady and unsteady problems with and without source terms. It shows that the numerical results are in good agreement with the existing analytical solutions as well as experimental data in some test cases.
机译:提出了一种结合深度梯度法(DGM)和加权平均通量(WAF)法的改进的预测校正器方案,以求解带源项的一维浅水方程。通过DGM在每个单元格中使用分段线性重构,获得预测器步骤中的近似解。然后,可以在相应的半时间步长处通过这些预测值直接计算源项。在校正步骤中,将WAF方法的TVD版本应用于每个像元面在相同的半时间步长处计算数值通量。通过应用该方法解决带有或不带有源项的稳态和非稳态问题中的各种测试案例,表明了数值解的准确性。结果表明,数值结果与现有的解析解以及某些测试案例的实验数据吻合良好。

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  • 来源
    《Mathematical Problems in Engineering》 |2011年第2期|p.1-17|共17页
  • 作者

    Montri Maleewong;

  • 作者单位

    Department of Mathematics, Faculty of Sciences, Kasetsart University, Bangkok 10900, Thailand,Centre of Excellence in Mathematics, CHE, Si Ayutthaya Road, Bangkok 10400, Thailand;

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  • 正文语种 eng
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