A Quasi-Conservative Discontinuous Galerkin Method for Multi-component Flows Using the Non-oscillatory Kinetic Flux II: ALE Framework

A Quasi-Conservative Discontinuous Galerkin Method for Multi-component Flows Using the Non-oscillatory Kinetic Flux II: ALE Framework
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使用非振荡动能通量 II 的多组分流准保守不连续伽辽金方法:ALE 框架

DOI:
10.1007/s10915-021-01732-4
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发表时间:
2021-12
影响因子:
2.5
通讯作者:
Yibing Chen
Yibing Chen
中科院分区:
数学2区
文献类型:
--
作者:
Dongmi Luo;Shiyi Li;Weizhang Huang;Jianxian Qiu;Yibing Chen

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提出了一种用于可压缩多组分流动数值模拟的高阶拟守恒间断Galerkin方法。该方法的一个显著特点是采用预估-校正策略来定义网格速度。首先根据流速计算拉格朗日网格,然后将其用作移动网格方法(移动网格偏微分方程组或MMPDE方法)中的初始网格,以提高其质量。流体动力学方程在直接任意拉格朗日-欧拉框架下使用DG单元和非振荡运动通量离散,而组分方程采用准保守DG格式离散,以避免材料界面附近的数值振荡。给出了一维和二维算例,验证了该方法的收敛阶和恒压速保持性。它们还表明,将拉格朗日网格与MMPDE移动网格方法相结合,可以很好地将网格点集中在激波区域和材料界面上。
A high-order quasi-conservative discontinuous Galerkin (DG) method is proposed for the numerical simulation of compressible multi-component flows. A distinct feature of the method is a predictor-corrector strategy to define the grid velocity. A Lagrangian mesh is first computed based on the flow velocity and then used as an initial mesh in a moving mesh method (the moving mesh partial differential equation or MMPDE method ) to improve its quality. The fluid dynamic equations are discretized in the direct arbitrary Lagrangian-Eulerian framework using DG elements and the non-oscillatory kinetic flux while the species equation is discretized using a quasi-conservative DG scheme to avoid numerical oscillations near material interfaces. A selection of one- and two-dimensional examples are presented to verify the convergence order and the constant-pressure-velocity preservation property of the method. They also demonstrate that the incorporation of the Lagrangian meshing with the MMPDE moving mesh method works well to concentrate mesh points in regions of shocks and material interfaces.
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