An algebraic variational multiscale-multigrid method for large-eddy simulation: generalized-α time integration, Fourier analysis and application to turbulent flow past a square-section cylinder

An algebraic variational multiscale-multigrid method for large-eddy simulation: generalized-α time integration, Fourier analysis and application to turbulent flow past a square-section cylinder
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用于大涡模拟的代数变分多尺度多重网格方法:广义α时间积分、傅立叶分析及其在流经方形截面圆柱体的湍流中的应用

DOI:
10.1007/s00466-010-0541-x
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发表时间:
2011
影响因子:
4.1
通讯作者:
Wall W.A.
Wall W.A.
中科院分区:
工程技术2区
文献类型:
--
作者:
Gravemeier V;Kronbichler M;Gee M.W;Wall W.A.

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本文从三个方面研究了最近提出的代数变分多尺度多重网格方法在湍流大涡模拟中的应用。首先,将该方法转化为二阶精度的广义α时间推进格式。其次,傅立叶分析的简化模型的问题进行评估的整体性能的方法上的尺度分离的影响。分析表明,投影算子实现的尺度分离提供了非常接近理想的小尺度子网格粘性的建模效果,也就是说,它保留了低频率,与非投影尺度分离相反。第三,将代数变分多尺度多重网格方法应用于方形截面圆柱的湍流流动。用该方法获得的计算结果一方面揭示了在相当粗略的离散化下已经实现的对于该具有挑战性的测试用例的良好精度,另一方面揭示了上级的计算效率,例如,与传统的动态Smagorinsky建模方法相比。
This article studies three aspects of the recently proposed algebraic variational multiscale-multigrid method for large-eddy simulation of turbulent flow. First, the method is integrated into a second-order-accurate generalized-α time-stepping scheme. Second, a Fourier analysis of a simplified model problem is performed to assess the impact of scale separation on the overall performance of the method. The analysis reveals that scale separation implemented by projective operators provides modeling effects very close to an ideal small-scale subgrid viscosity, that is, it preserves low frequencies, in contrast to non-projective scale separations. Third, the algebraic variational multiscale-multigrid method is applied to turbulent flow past a square-section cylinder. The computational results obtained with the method reveal, on the one hand, the good accuracy achievable for this challenging test case already at a rather coarse discretization and, on the other hand, the superior computing efficiency, e.g., compared to a traditional dynamic Smagorinsky modeling approach.
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