Numerical flux functions for Reynolds‐averaged Navier–Stokes and kω turbulence model computations with a line‐preconditioned p‐multigrid discontinuous Galerkin solver

Numerical flux functions for Reynolds‐averaged Navier–Stokes and kω turbulence model computations with a line‐preconditioned p‐multigrid discontinuous Galerkin solver
复制标题

使用线预处理 pâmultigrid 不连续 Galerkin 求解器进行雷诺平均纳维斯托克斯和 kÏ 湍流模型计算的数值通量函数

DOI:
10.1002/fld.3702
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发表时间:
2013
影响因子:
1.8
通讯作者:
M. Lange-Hegermann
M. Lange-Hegermann
中科院分区:
工程技术4区
文献类型:
--
作者:
M. Wallraff;T. Leicht;M. Lange-Hegermann

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给出了完全耦合的雷诺平均N-S湍流模型方程和K-ω湍流模型方程的拟线性对流通量公式的特征分解。基于这些结果,我们构造了不同的近似黎曼解算器,它们可以用作DG离散化中的数值通量函数。通过数值算例研究了不同策略对解精度的影响。实际计算采用AP-多重网格算法。为此,我们构造了一个具有后向欧拉光滑器的框架,其中线性方程组用一般的预条件Krylov方法来求解。我们给出了无矩阵实现和内存贫乏的行-雅可比预处理器,并比较了一些参数选择的效果。特别是,p-多重网格的效率被发现比其他作者最近的发现可能预期的要低。这可能是由于考虑了湍流的影响。版权所有©2012 John Wiley&Sons,Ltd.
We present an eigen‐decomposition of the quasi‐linear convective flux formulation of the completely coupled Reynolds‐averaged Navier–Stokes andkωturbulence model equations. Based on these results, we formulate different approximate Riemann solvers that can be used as numerical flux functions in a DG discretization. The effect of the different strategies on the solution accuracy is investigated with numerical examples. The actual computations are performed using ap‐multigrid algorithm. To this end, we formulate a framework with a backward‐Euler smoother in which the linear systems are solved with a general preconditioned Krylov method. We present matrix‐free implementations and memory‐lean line‐Jacobi preconditioners and compare the effects of some parameter choices. In particular,p‐multigrid is found to be less efficient than might be expected from recent findings by other authors. This might be due to the consideration of turbulent flow. Copyright © 2012 John Wiley & Sons, Ltd.
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发表时间: 2012
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