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首页> 外文会议>ERCOFTAC International Symposium on Engineering Turbulence Modelling and Measurements(ETMM6); 20050523-25; Sardinia(IT) >APPROXIMATE NEAR-WALL TREATMENTS BASED ON ZONAL AND HYBRID RANS-LES METHODS FOR LES AT HIGH REYNOLDS NUMBERS
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APPROXIMATE NEAR-WALL TREATMENTS BASED ON ZONAL AND HYBRID RANS-LES METHODS FOR LES AT HIGH REYNOLDS NUMBERS

机译：基于雷诺数的区域和混合Rans-les方法的近似近壁处理

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摘要

Two strategies, combining a LES scheme with different near-wall RANS approximations, are investigated by reference to simulations for plane channel flow and two separated flows at moderate and high Reynolds numbers, respectively. One strategy is a hybrid modelling scheme, wherein the subgrid-scale model in the outer LES domain is interfaced with a RANS model in a predefined near-wall layer. The other is a zonal method in which a thin-shear-flow RANS solution in the near-wall layer, embedded within the LES domain which covers the entire flow, is used to provide boundary conditions for the LES computation, the two thus being loosely coupled. Both methods allow the thickness of the near-wall RANS layer to be chosen freely. In the hybrid LES-RANS scheme, the near-wall layer is interfaced to the outer LES region, subject to compatibility conditions for velocity and turbulent viscosity imposed across the interface. These conditions are extracted dynamically as the simulation progresses. In the zonal approach, a mixing-layer model provides the eddy-viscosity field in the near-wall layer, while in the hybrid approach, a two-equations (k—ε) model is used.
机译：通过分别参考平面通道流和中，高雷诺数下两个分离流的模拟，研究了将LES方案与不同的近壁RANS近似组合的两种策略。一种策略是混合建模方案，其中外部LES域中的子网格规模模型与预定义的近壁层中的RANS模型对接。另一种是分区方法，其中使用嵌入在覆盖整个流的LES域内的近壁层中的薄剪切流RANS解决方案来为LES计算提供边界条件，因此这两种方法很松散耦合的。两种方法都允许自由选择近壁RANS层的厚度。在混合LES-RANS方案中，近壁层与外部LES区域连接，并受跨该接口施加的速度和湍流粘度的相容性条件的影响。随着仿真的进行，将动态提取这些条件。在分区方法中，混合层模型在近壁层中提供了涡流粘度场，而在混合方法中，则使用了两方程（k-ε）模型。

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