arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.11649physics.comp-ph
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任意拉格朗日-欧拉方程可压缩流动的重构间断Galerkin方法

Reconstructed discontinuous Galerkin method for compressible flows in arbitrary Lagrangian-Eulerian formulation

Chuanjin Wang, Hong Luo

摘要:

提出了一种基于任意拉格朗日-欧拉(ALE)格式的高精度重构间断Galerkin(rDG)方法,用于求解运动和变形区域上的二维可压缩流动.所使用的泰勒基函数被定义在时间依赖域上,在该时间依赖域上也进行积分和计算。时间积分采用三阶ESDIRK 3格式。通过在高斯求积点修改离散方程右侧的网格速度项,满足几何守恒定律(GCL)。为了避免过度变形和无效元素附近的移动边界,我们使用径向基函数(RBF)插值方法传播的网格运动的边界节点的内部的网格。数值算例验证了所设计的时空精度阶数,并验证了rDG-ALE方法处理动边界问题的能力。

英文摘要:

We present a high-order accurate reconstructed discontinuous Galerkin (rDG) method in arbitrary Lagrangian-Eulerian (ALE) formulation, for solving two-dimensional compressible flows on moving and deforming domains with unstructured curved meshes. The Taylor basis functions in use are defined on the time-dependent domain, on which also the integration and computations are performed. A third order ESDIRK3 scheme is employed for the temporal integration. The Geometric Conservation Law (GCL) is satisfied by modifying the grid velocity terms on the right-hand side of the discretized equations at Gauss quadrature points. To avoid excessive distortion and invalid elements near the moving boundary, we use the radial basis function (RBF) interpolation method for propagating the mesh motion of the boundary nodes to the interior of the mesh. Several numerical examples are performed to verify the designed spatial and temporal orders of accuracy, and to demonstrate the ability of handling moving boundary problems of the rDG-ALE method.

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