A New Low Reynolds Stress Transport Model for Heat Transfer and Fluid in Engineering Applications

Rongguang Jia; Bengt Sunden; Mohammad Faghri

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A New Low Reynolds Stress Transport Model for Heat Transfer and Fluid in Engineering Applications

机译：工程应用中传热和流体的新型低雷诺应力传递模型

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A new Reynolds stress transport model (RSTM) aimed for engineering applications is proposed with consideration of near-wall turbulence. This model employs the Speziale, Sarkar, and Gatski (SSG) pressure strain term, the ω equation, and the shear stress transport (SST) model for the shear stresses at the near-wall region (say, y~+ < 30). The models are selected based on the following merits: The SSG RSTM model performs well in the fully turbulent region and does not need the wall normal vectors; the ω equation can be integrated down to the wall without damping functions. The SST model is a proper two-equation model that performs well for flows with adverse pressure gradient, while most two-equation models can have a good prediction of the shear stresses. A function is selected for the blending of the RSTM and SST. Three cases are presented to show the performance of the present model: (ⅰ) fully developed channel flow with Re_τ=395, (ⅱ) backward-facing step with an expansion ratio of 1.2 and Re =5200 base on the step height, and (ⅲ) circular impingement with the nozzle-to-wall distance H=4D and Re =20,000. It is believed that the new model has good applicability for complex flow fields.

机译：考虑到近壁湍流，提出了一种新的针对工程应用的雷诺应力传递模型（RSTM）。该模型采用了Speziale，Sarkar和Gatski（SSG）压力应变项，ω方程，以及针对近壁区域的剪应力（例如y〜+ <30）的剪应力传递（SST）模型。选择这些模型是基于以下优点：SSG RSTM模型在完全湍流区域中表现良好，不需要壁法向矢量； ω方程可以向下积分到墙而无阻尼功能。 SST模型是一个合适的二方程模型，对于具有不利压力梯度的流动表现良好，而大多数二方程模型可以很好地预测剪切应力。选择了用于RSTM和SST混合的功能。提出了三种情况以展示本模型的性能：（ⅰ）Re_τ= 395的充分发展的通道流，（ⅱ）基于步长的膨胀比为1.2和Re = 5200的后向台阶，以及（ ⅲ）圆形冲击，喷嘴到壁的距离H = 4D，Re = 20,000。可以相信，新模型对复杂的流场具有良好的适用性。

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来源
《Journal of Heat Transfer》 |2007年第4期|p.434-440|共7页
作者
Rongguang Jia; Bengt Sunden; Mohammad Faghri;
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作者单位

Fluent Inc., Lebanon, NH;

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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
中图分类热力工程、热机;
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A New Low Reynolds Stress Transport Model for Heat Transfer and Fluid in Engineering Applications

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