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首页> 外文期刊>International Journal of Heat and Mass Transfer >Partially Averaged Navier Stokes simulation of turbulent heat transfer from a square cylinder
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Partially Averaged Navier Stokes simulation of turbulent heat transfer from a square cylinder

机译：方筒湍流传热的部分平均Navier Stokes模拟

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摘要

A variable resolution modeling approach, namely the Partially-Averaged Navier Stokes (PANS) approach, is used to study heat transfer in a separated turbulent flow field. The simulations are performed to assess the applicability and effectiveness of the PANS approach. Two types of grids are compared: a structured grid with full hexahedral elements with wall functions model (SM-WF) and an unstructured grid with hybrid tetrahedral-prismatic elements with wall resolve model (UM-WR). A heated square cylinder in cross air stream at Re = 2.2 × 10~4 is considered and the simulations are performed using a finite volume based opensource software, OpenFOAM. It is observed that the PANS approach, with both the meshing strategies adopted, is able to predict the unsteady flow behavior around the cylinder and in the wake. But, only the wall resolve case reproduces the thermal and the Nusselt number behaviors around the cylinder as compared to experimental results. Further the wall resolve model is used to study the heat transfer phenomena at different faces of the cylinder over a complete vortex shedding cycle using the phase-averaged analysis of the shedding phenomenon. The turbulent heat fluxes are also studied to understand the effect of turbulence on convection.
机译：可变分辨率建模方法（即部分平均Navier Stokes（PANS）方法）用于研究分离的湍流场中的传热。执行仿真以评估PANS方法的适用性和有效性。比较了两种类型的网格：具有壁函数模型的完整六面体元素的结构化网格（SM-WF）和具有壁分辨模型的混合四面体-棱柱形元素的非结构化网格（UM-WR）。考虑了在Re = 2.2×10〜4的交叉气流中加热的方筒，并使用基于有限体积的开源软件OpenFOAM进行了仿真。可以观察到，采用了两种网格划分策略的PANS方法都能够预测圆柱体周围和尾流中的非稳态流动行为。但是，与实验结果相比，只有墙体分解情况才能再现圆柱体周围的热和Nusselt数行为。此外，使用壁分解模型，通过对脱落现象的相位平均分析，可以研究整个涡旋脱落周期中圆柱体不同面上的传热现象。还研究了湍流热通量，以了解湍流对流的影响。

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