Constrained subgrid-scale stress model for large eddy simulation
Constrained subgrid-scale stress model for large eddy simulation
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DOI：
10.1063/1.2831134
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发表时间：
2008-01
影响因子：
4.6
通讯作者：
Yipeng Shi;Zuoli Xiao;Shiyi Chen
中科院分区：
文献类型：
--
作者：
Yipeng Shi;Zuoli Xiao;Shiyi Chen
在这封信中，我们建议施加物理约束的动态亚网格尺度（SGS）应力模型在大涡模拟的动态过程中，并使用约束变分计算SGS模型系数。对受迫和衰减的各向同性湍流的数值模拟表明，约束动力混合模型能较好地预测能量演化和SGS能量耗散。受约束的SGS模型也显示出与真实的应力的强相关性，并且能够捕获能量后向散射，表现出结合动力学Smagorinsky和混合模型的优点的期望特征。
In this letter, we propose to impose physical constraints in the dynamic procedure of the dynamic subgrid-scale (SGS) stress model in large eddy simulation, and to calculate the SGS model coefficients using a constrained variation. Numerical simulations of forced and decaying isotropic turbulence demonstrate that the constrained dynamic mixed model predicts the energy evolution and the SGS energy dissipation well. The constrained SGS model also shows a strong correlation with the real stress and is able to capture the energy backscatter, manifesting a desirable feature of combining the advantages of dynamics Smagorinsky and mixed models.