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首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Subgrid-scale models for large-eddy simulation of rotating turbulent channel flows
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Subgrid-scale models for large-eddy simulation of rotating turbulent channel flows

机译：APS-APS流体动力学分部第70届年会-事件-大网格模拟旋转湍流通道流动的大网格模型

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We aim to design subgrid-scale models for large-eddy simulation of rotating turbulent flows.Rotating turbulent flows form a challenging test case for large-eddy simulation due to the presence of the Coriolis force.The Coriolis force conserves the total kinetic energy while transporting it from small to large scales of motion, leading to the formation of large-scale anisotropic flow structures.The Coriolis force may also cause partial flow laminarization and the occurrence of turbulent bursts.Many subgrid-scale models for large-eddy simulation are, however, primarily designed to parametrize the dissipative nature of turbulent flows, ignoring the specific characteristics of transport processes.We, therefore, propose a new subgrid-scale model that, in addition to the usual dissipative eddy viscosity term, contains a nondissipative nonlinear model term designed to capture transport processes, such as those due to rotation.We show that the addition of this nonlinear model term leads to improved predictions of the energy spectra of rotating homogeneous isotropic turbulence as well as of the Reynolds stress anisotropy in spanwise-rotating plane-channel flows.
机译：我们旨在为旋转涡流的大涡流仿真设计亚网格规模模型。由于存在科里奥利力，旋转湍流形成了大涡流仿真的具有挑战性的测试案例。科里奥利力在运输时节省了总动能从小到大的运动，导致形成大尺度的各向异性流动结构。科里奥利力还可能引起部分流层化和湍流爆发的发生，但是有许多用于大涡模拟的亚网格模型最初设计为参数化湍流的耗散性质，而忽略了运输过程的特定特征，因此，我们提出了一个新的亚网格规模模型，除通常的耗散涡流粘度项外，还包含了一个非耗散非线性模型项捕获运输过程，例如由于旋转引起的过程。我们证明，添加此非线性模型项会导致旋转均质各向同性湍流的能谱以及展宽旋转平面通道流中的雷诺应力各向异性的预测。

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