1) near-wall turbulence 近壁湍流1. And statistic characteristic of near-wall turbulence is researched. 在此基础上,采用剪切修正亚格子模型的大涡模拟(LES)的方法,模拟了不同雷诺数下的槽道湍流,研究了近壁湍流的统计性质,进而在壁面加入吹吸,研究了空间周期的湍流场中雷诺应力和速度变形率之间的相位关系...
Using a variety of techniques, including direct tracking of the structures, it is shown that an important characteristic of wall-bounded turbulence is temporally intermittent bursting, which is present at all distances from the wall, and in other shear flows. Its properties and time scales are ...
Near-wall turbulence. 来自 EBSCO 喜欢 0 阅读量: 32 作者:Jiménez,Javier 摘要: The current state of knowledge about the structure of wall-bounded turbulent flows is reviewed, with emphasis on the layers near the wall in which shear is dominant, and particularly on the logarithmic layer. It ...
Data from boundary layer simulations are used to analyze the dependence of the eddy-viscosity damping-function on the Reynolds number and the distance from the wall. The computed budgets are used to test existing near-wall turbulence models of the k-epsilon type. It was found that the ...
(1987): “Near-wall k —ε -Turbulence Modeling,” 6th Symposium on Turbulent Shear Flows, Toulouse, 17–4Mansour, N. N., Kim, J. and Moin, P., "Near-wall k-epsilon Tur- bulence Modeling", In 6th Symposium on Turbulent Shear Flows, pp. 17-4 (1987)....
A novel near-wall LES closure model is developed based on a revised form of the one-dimensional turbulence (ODT) model of Kerstein and is tested by performing LES calculations of turbulent channel flow at Reynolds numbers based on friction velocity ranging from 395 to 10,000. In contrast to ...
In near-wall turbulence modeling it is required to resolve a thin layer nearby the solid boundary, which is characterized by high gradients of the solution. An accurate enough resolution of such a layer can take most computational time. The situation even becomes worse for unsteady problems. To...
Direct numerical simulation of near-wall turbulence: Passive and active control. In this work we analyze high-resolution numerical data bases for a turbulent channel flow with near-wall turbulence control applied at the lower wall. The ... CH Crawford - Princeton University. 被引量: 0发表: ...
New measurements of the streamwise component of the turbulence intensity in a fully developed pipe flow at Reynolds numbers up to 145 000 indicate that the magnitude of the near-wall peak is invariant with Reynolds number in location and magnitude. The results agree with previous pipe flow data ...
(above a critical strength ωyc) is shown to generate new streamwise vortices, which dominate near-wall turbulence phenomena. This new vortex formation mechanism consists of: (i) instability-initiated streak waviness in the horizontal plane, (ii) generation of thin horizontal sheets of streamwise ...