Parallel adaptive mesh refinement for large-eddy simulations of turbulent flows
Parallel adaptive mesh refinement for large-eddy simulations of turbulent flows
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DOI：
10.1016/j.compfluid.2014.09.050
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发表时间：
2015-03
影响因子：
2.8
通讯作者：
O. Antepara;O. Lehmkuhl;R. Borrell;J. Chiva;A. Oliva
中科院分区：
文献类型：
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作者：
O. Antepara;O. Lehmkuhl;R. Borrell;J. Chiva;A. Oliva
提出了一种适用于湍流大涡模拟的并行自适应网格加密方法。Navier-Stokes方程的基本离散化是基于有限体积守恒公式，其目的是保持连续微分算子的对称性，并确保动能平衡的稳定性和守恒。保存属性进行了测试，从AMR过程中产生的网格，其中通常包含不同级别的细化区域之间的过渡。我们的AMR方案采用了基于细胞的细化技术，与基于物理的细化标准的基础上变分多尺度（VMS）分解理论。整个AMR过程中，从选择的细胞细化/粗化，直到预处理所产生的网格，已实施的并行代码，其并行性能已被证明在AMD Opteron的超级计算机。最后，我们的方法的鲁棒性和准确性的数值模拟的湍流绕方柱在Re = 22，000和湍流绕两个并排方柱在Re = 21，000。
In this paper a parallel adaptive mesh refinement (AMR) strategy for large eddy simulations (LES) of turbulent flows is presented. The underlying discretization of the Navier–Stokes equations is based on a finite-volume symmetry-preserving formulation, with the aim of preserving the symmetry properties of the continuous differential operators and ensure both, stability and conservation of kinetic-energy balance. The conservation properties are tested for the meshes resulting from the AMR process, which typically contain transitions between zones with different level of refinement. Our AMR scheme applies a cell-based refinement technique, with a physics-based refinement criteria based on the variational multi-scale (VMS) decomposition theory. The overall AMR process, from the selection of the cells to be refined/coarsened till the pre-processing of the resulting mesh, has been implemented in a parallel code, for which the parallel performance has been attested on an AMD Opteron based supercomputer. Finally, the robustness and accuracy of our methodology is shown on the numerical simulation of the turbulent flow around a square cylinder at Re = 22,000 and the turbulent flow around two side-by-side square cylinders at Re = 21,000.