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首页> 外文期刊>Numerical Heat Transfer, Part B. Fundamentals: An International Journal of Computation and Methodology >BOUNDARY-LAYER EQUATION-BASED WALL MODEL FOR LARGE-EDDY SIMULATION OF TURBULENT FLOWS WITH WALL HEAT TRANSFER
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BOUNDARY-LAYER EQUATION-BASED WALL MODEL FOR LARGE-EDDY SIMULATION OF TURBULENT FLOWS WITH WALL HEAT TRANSFER

机译：基于边界层方程的壁面传热湍流湍流大涡模拟

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摘要

A new thermal boundary-layer model is developed that alleviates the stringent near-wall grid resolution requirement in large-eddy simulations of turbulent flows with wall heat transfer. The model is based on solving the turbulent temperature boundary-layer equation to determine the temperature profile in the near-wall region. The near-wall temperature profile is used to compute the instantaneous wall heat flux, which replaces the temperature (Dirichlet) wall boundary condition specified a priori. This approach is analogous to the wall stress model developed by Balaras et al. [1], in which the instantaneous wall shear stresses replace the no-slip wall boundary conditions. Three benchmark turbulent flows are studied using coarse-grid large-eddy simulations coupled with the new thermal wall model: (1) a fully developed turbulent channel flow with a heated top wall, (2) a backward facing step flow with a heated bottom wall, and (3) an impinging jet on a heated circular plate. Large-eddy simulations are performed using the commercial code CFD-ACE +, with the localized dynamic subgrid kinetic energy model of Kim and Menon [2] providing the subgrid stresses. Turbulence statistics are compared with benchmark data from direct numerical simulations and experiments and also with data from resolved large-eddy simulations (i.e., near-wall y~+≈1). Excellent agreement among the data is obtained.
机译：开发了一种新的热边界层模型，该模型减轻了带有壁传热的湍流大涡模拟中严格的近壁网格分辨率要求。该模型基于求解湍流温度边界层方程来确定近壁区域的温度分布。近壁温度曲线用于计算瞬时壁热通量，该热通量替代了先验指定的温度（Dirichlet）壁边界条件。这种方法类似于Balaras等人开发的墙体应力模型。文献[1]中，瞬时墙剪应力代替了防滑墙的边界条件。使用粗网格大涡模拟和新的热壁模型对三种基准湍流进行了研究：（1）具有加热顶壁的充分发展的湍流通道流;（2）具有加热底壁的后向阶梯流（3）加热的圆形板上的撞击射流。大涡模拟是使用商业代码CFD-ACE +进行的，Kim和Menon [2]的局部动态子网格动能模型提供了子网格应力。将湍流统计数据与直接数值模拟和实验中的基准数据进行比较，并与解析后的大涡流模拟（即近壁y〜+≈1）中的数据进行比较。数据之间获得了极好的一致性。

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