提示
一种基于尺度分解的湍流计算新方法
首发时间：2022-06-20
摘要：基于湍流的多尺度、不同尺度流动相似性的特点,提出了一种新的求解不可压缩湍流问题的尺度分解方法. 把需要求解的问题分解为较大的计算尺度和近似评估的小尺度两部分,在计算尺度上建立平均量的流动控制方程,对小尺度上的脉动影响以等效的方式叠加到计算尺度方程中；通过进一步对小尺度上的脉动影响分解为对平均量的对流影响和耗散影响两部分,建立了相应的修正项,保证了计算尺度上的流动控制方程是封闭的；通过圆柱绕流问题的验证,本方法能够对不同雷诺数的流动建立统一的方法,获得从低到高雷诺数流动的特性. 本方法具有一定的通用性.
关键词：
for information in english, please click here
a new turbulence model basing on scale decomposition
abstract：based on the characteristics of the multi-scale and self-similarity at different scales of turbulence flow , there proposes a scale decomposition method for solving the incompressible turbulence problem. the solving domain is decompose into two levels including one large-scale component and some small-scale components, the large-scale one represents mean flow and the small-scale ones represent 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; moreover, the effect is decompose into two parts including convective effect and diffusion effect, the net effect of two parts are parameterized by using mean flow properties, add the net effect of two parts into the flow control equations and ensure the closures of the equations. in the study, flow around cylinders were numerically investigated and this model is able to establish a unified method for flows simulation from low to high reynolds numbers.
keywords：
基金：
论文图表：
引用
导出参考文献
no.****
动态公开评议
共计0人参与
勘误表
一种基于尺度分解的湍流计算新方法
评论
全部评论