A grid and flow adaptive wall-function method for RANS turbulence modelling
A grid and flow adaptive wall-function method for RANS turbulence modelling
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DOI：
10.1016/j.jcp.2006.05.003
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发表时间：
2006-12
期刊：
影响因子：
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通讯作者：
T. Knopp;T. Alrutz;D. Schwamborn
中科院分区：
文献类型：
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作者：
T. Knopp;T. Alrutz;D. Schwamborn
本文提出了一种用于RANS湍流模拟的网格和流动自适应壁面函数方法。近壁网格自适应技术确保了局部适当的分辨率，这取决于要捕获的近壁流动物理特性和壁函数模型的有效性范围。本文研究了Spalart-Allmaras和SST k-ω湍流模型的近壁RANS解在驻点附近和随后的未充分发展的湍流以及在分离前的逆压梯度区的情况。并与相应的湍流模型的通用壁面函数进行了比较，给出了非平衡流动壁面函数方法设计的建议。非平衡流动区域由基于流动的传感器检测，然后由于壁函数的混合特性而使得近壁网格自适应成为可能。
This paper presents a grid and flow adaptive wall-function method for RANS turbulence modelling with emphasis on aerodynamic flows. A near-wall grid adaptation technique ensures a locally appropriate resolution depending on both the near-wall flow physics to be captured and the range of validity of the wall-function model. The near-wall RANS solutions of the Spalart–Allmaras and SST k–ω turbulence model are investigated near stagnation points and subsequent not yet fully developed turbulent flow, and in regions of adverse pressure gradient before separation. These are compared with the corresponding turbulence model specific universal wall-functions and suggestions for the design of wall-function methods for non-equilibrium flows are given. Regions of non-equilibrium flow are detected by a flow based sensor and near-wall grid adaptation is then made possible due to the hybrid character of the wall-functions.