基于标度律的壁湍流运动分解与雷诺数效应  

Scaling-law-based decomposition and Reynolds-number effects of wall-bounded turbulent motions

作　　者：胡锐锋 HU Ruifeng(College of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730000,China;Key Laboratory of Mechanics on Disaster and Environment in Western China,The Ministry of Education of China,Lanzhou University,Lanzhou 730000,China;Center for Particle-Laden Turbulence,Lanzhou University,Lanzhou 730099,China)

机构地区：[1]兰州大学土木工程与力学学院,兰州730000 [2]兰州大学西部灾害与环境力学教育部重点实验室,兰州730000 [3]兰州大学湍流–颗粒研究中心,兰州730099

出　　处：《实验流体力学》2024年第4期29-43,共15页Journal of Experiments in Fluid Mechanics

基　　金：国家自然科学基金项目(11972175,92052202,11490553,11502185)。

摘　　要：壁湍流广泛存在于自然界和工程中,对其深入研究和理解有助于发展新的计算模型和调控手段。湍流具有多尺度性,壁面带来的各向异性使得壁湍流多尺度运动更为复杂。本文探讨和总结了基于标度律的壁湍流运动分解方法:内–外分解方法和外区分解方法,其中内–外分解方法基于内区湍流运动的雷诺数无关性,而外区分解方法基于Townsend的附着涡标度律;讨论了分解后壁湍流运动统计特性的雷诺数效应,给出了内区湍流运动达到雷诺数无关和出现外区湍流运动的2个临界雷诺数。Wall-bounded turbulence widely exists in nature and engineering,the in-depth study and understanding of which can help to develop new computational models and control methodology.Turbulence has multi-scale characteristics,and the anisotropy caused by the wall makes the multi-scale motions of wall turbulence more complex and challenging.This paper discusses and summarizes the scaling-law-based decomposition methods for wall-bounded turbulent motions,including inner-outer decomposition and outer decomposition.The inner-outer decomposition is based on the Reynolds-number independence of the inner turbulent motions,and the outer decomposition is based on the scaling laws of Townsend’s attached eddy hypothesis.Finally,the Reynolds number effect of the statistical characteristics of the wall turbulent motions after decomposition is discussed,and two critical Reynolds numbers are given for the inner turbulent motions to reach Reynolds number independence and for the appearance of the outer turbulent motions.

关 键 词：壁湍流 相干结构 尺度分解 标度律 雷诺数效应 内–外分解 外区分解 

分 类 号：O357.52[理学—流体力学]