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The solution of the compressible Euler equations at low Mach numbers using a stabilized finite element algorithm

机译:低马赫数可压缩欧拉方程的稳定有限元算法求解

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We present a streamline-upwind/Petrov-Galerkin (SUPG) algorithm for the solution of the compressible Euler equations at low Mach numbers. The Euler equations are written in terms of entropy variables which result in Jacobian matrices which are symmetric. We note that, in the low Mach number limit, the SUPG method with the standard choices for the stabilization matrix fail to provide Adequate stabilization. This results in a degradation of the solution accuracy. We propose a stabilization matrix which incorporates Dimensional-scaling arguments and which exhibits the appropriate behavior for low Mach numbers.
机译:我们提出了一种上风向/ Petrov-Galerkin(SUPG)算法,用于在低马赫数下求解可压缩的Euler方程。欧拉方程是根据熵变量来写的,这导致对称的雅可比矩阵。我们注意到,在较低的马赫数限制下,具有稳定矩阵标准选择的SUPG方法无法提供足够的稳定度。这导致求解精度下降。我们提出了一个稳定矩阵,其中包含了维数比例缩放参数,并且对于低马赫数表现出适当的行为。

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