A DDES model with a Smagorinsky-type eddy viscosity formulation and log-layer mismatch correction

K.R. Reddy; J. A. Ryon; P.A. Durbin

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A DDES model with a Smagorinsky-type eddy viscosity formulation and log-layer mismatch correction

机译：具有Smagorinsky型涡流粘度公式和对数层失配校正的DDES模型

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The current work develops a variant of delayed detached eddy simulation (DDES) that could be characterized as limiting the production term. Previous formulations have been based on limiting the dissipation rate (Spalart et al., 2006). A clipped length scale is applied directly to the eddy viscosity, yielding a Smagorinsky-like formulation when the model is on the eddy simulation branch. That clipped eddy viscosity limits the production rate. The length scale is modified in order to account for the log-layer mismatch (a well-known issue with DDES), without using additional blending functions. Another view of our approach is that the subgrid eddy-viscosity is represented by a mixing length formula l~2 ω; in the eddy field ω acts like a filtered rate of strain. Our model is validated for channel flow as well as separated flows (backward-facing step, 2D periodic hills) and illustrated via an air-blast atomizer.

机译：当前的工作开发了一种延迟分离涡模拟（DDES）的变体，其特征在于限制了生产期限。以前的公式是基于限制耗散率的（Spalart等，2006）。修剪后的长度比例直接应用于涡流粘度，当模型位于涡流仿真分支上时，将产生类似于Smagorinsky的公式。降低的涡流粘度限制了生产率。修改长度比例以解决对数层不匹配（DDES的一个众所周知的问题），而无需使用其他混合功能。我们的方法的另一种观点是，亚网格涡流粘度由混合长度公式l〜2ω表示；在涡流场中，ω的作用类似于滤波后的应变率。我们的模型已针对通道流和分离流（向后步骤，2D周期性丘陵）进行了验证，并通过鼓风雾化器进行了说明。

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《International Journal of Heat and Fluid Flow》 |2014年第12期|103-113|共11页
作者
K.R. Reddy; J. A. Ryon; P.A. Durbin;
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作者单位

Iowa State University, 2271 Howe Hall, Room 1200, Ames, IA 50011, USA;

United Technologies Aerospace Systems, Engine Components Division, West Des Moines, IA 50265, USA;

Iowa State University, 2271 Howe Hall, Room 1200, Ames, IA 50011, USA;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
Turbulence Modeling; Hybrid RANS/LES; DDES;

机译：湍流建模;混合RANS / LES;DDES;

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A DDES model with a Smagorinsky-type eddy viscosity formulation and log-layer mismatch correction

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