Turbulent drag reduction by spanwise oscillations of a channel wall with porous layer

被引：6

作者：

Li, Qing-Xiang ^{[1
]}

Pan, Ming ^{[1
]}

Zhou, Quan ^{[1
,2
]}

Dong, Yu-Hong ^{[1
,2
]}

机构：

[1] Shanghai Univ, Shanghai Inst Appl Math & Mech, Shanghai 200072, Peoples R China

[2] Shanghai Key Lab Mech Energy Engn, Shanghai 200072, Peoples R China

来源：

COMPUTERS & FLUIDS | 2019年 / 180卷

基金：

中国国家自然科学基金;

关键词：

Turbulence; Channel flow; Porous medium; Spanwise oscillations; Drag reduction; DIRECT NUMERICAL-SIMULATION; FLUID-FLOW; PERMEABILITY; EQUATION; WAVES; HEAT;

D O I：

10.1016/j.compfluid.2018.12.007

中图分类号：

TP39 [计算机的应用];

学科分类号：

081203 ; 0835 ;

摘要：

Direct numerical simulations (DNS) are carried out for the incompressible viscous turbulent flows over a spanwise-oscillating porous wall to investigate the effects of the oscillating porous wall on turbulence modifications as well as on turbulent drag reduction. The lattice Boltzmann method (LBM) based on D3Q19 model is applied to perform the numerical computation. Different Darcy numbers and porosities of porous medium are considered to pursue a significant drag reduction. An analytical solution to the Stokes second problem with two different kinds of fluid is derived, which predicts that the presence of porous layer will speed up the oscillation of the fluid when the porous medium is embedded in the Stokes layer. The current strategy suggests that comparing with the effects of the oscillating smooth wall, the joint effects of the porous wall and its spanwise oscillation may attain a larger drag reduction. (C) 2018 Elsevier Ltd. All rights reserved.

引用

页码：1 / 10

页数：10

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