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一种基于尺度分解的湍流计算新方法

发表时间:2022-12-29  浏览量:835  下载量:73
全部作者: 谭善文,何海宾,师波
作者单位: 西华大学流体及动力机械教育部重点实验室;西华大学建筑与土木工程学院;成都中图制冷工程设备有限责任公司
摘 要: 基于湍流的多尺度、不同尺度流动相似性的特点,本文提出了一种求解不可压缩牛顿流体湍流问题的尺度分解方法。把求解的问题在空间上分解为包含平均量的大尺度和脉动量的小尺度两部分,在大尺度上建立平均量的流动控制方程,脉动量对平均量的影响以等效涡的形式进行量化;进一步把等效涡分解为对平均量的对流影响和耗散影响两部分,表示为平均量的函数,建立相应的修正项,保证了大尺度上控制方程的封闭;通过圆柱绕流问题的数值仿真,获得了从低到高雷诺数(Re)的流动特性。本方法建立了一种通用的湍流计算模型,具有一定的工程应用价值。
关 键 词: 流体力学;湍流计算;尺度分解;圆柱绕流
Title: A new turbulence model based on scale decomposition
Author: TAN Shanwen, HE Haibin, SHI Bo
Organization: Key Laboratory of Fluid and Power Machinery, Ministry of Education; School of Architecture and Civil Engineering, Xihua University; Chengdu Zhongtu Refrigeration Engineering Equipment Co., Ltd.
Abstract: Based on the characteristics of the multi-scale and similarity at different scales of turbulence flow, this paper proposes a scale decomposition method for solving the turbulence problem of incompressible Newtonian fluid. The problem to be solved is decomposed into two-level scales in solving space, the large-scale one represents mean flow and the small-scale one represents the turbulent fluctuations. The problem is solved in large-scale level by the flow control equations and the effect of the turbulent fluctuations to the mean flow is evaluated approximately by using equivalent vortex. Furthermore, the equivalent vortex is decomposed into two parts including convective effect and diffusion effect on average flow, which is expressed as a function of mean folw. The corresponding amendments have been established. There ensures the closure of the equations in large scale. Flow around cylinder is numerically investigated and able to obtain flow behavior from low to high Reynolds (Re) numbers. A universal turbulence closure model was established in this study, which is worthy of engineering application.
Key words: fluid mechanics; turbulence calculation; scale decomposition; flow around cylinder
发表期数: 2022年12月第4期
引用格式: 谭善文,何海宾,师波. 一种基于尺度分解的湍流计算新方法[J]. 中国科技论文在线精品论文,2022,15(4):488-499.
 
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