Prediction of turbulent flow over rough surfaces using a force field in large eddy simulation
Prediction of turbulent flow over rough surfaces using a force field in large eddy simulation
复制标题
在大涡模拟中使用力场预测粗糙表面上的湍流
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
Ching
中科院分区：
文献类型：
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作者：
J. Cui;V. C. Patel;Ching
描述了一种模拟任意粗糙度表面湍流流动的力场模型。给定的粗糙度被分解为可分辨的和亚网格尺度的粗糙度，概念上类似于大涡模拟(LES)中的流动分解。对于给定的流动和雷诺数，选择笛卡尔网格来满足大涡模拟的要求。该栅格确定正式解析的粗糙度的几何特征。用于表示该解析粗糙度的力场是在大涡模拟求解过程中确定的，不需要任何经验输入。未解决的子网格粗糙度由随机力分布建模，其中指定了阻力系数。通过对具有叠加细粒粗糙度的波纹壁的管道内流动的计算，证明了该方法用于模拟表面粗糙度。
A force field model to simulate turbulent flow over a surface with arbitrary roughness is described. A given roughness is decomposed into resolved and subgrid-scale roughness, conceptually similar to the flow decomposition in large eddy simulation (LES). For a given flow and Reynolds number a Cartesian grid is selected to satisfy LES requirements. This grid determines the geometric features of the roughness that are formally resolved. The force field used to represent this resolved roughness is determined during the LES solution process, without any empirical input. The subgrid roughness that is not resolved is modeled by a random force distribution in which a drag coefficient is specified. Use of this approach to model surface roughness is demonstrated by calculations of the flow in a duct with a wavy wall with superimposed fine-grain roughness