LES Study on High Reynolds Turbulent Drag-Reducing Flow of Viscoelastic Fluids Based on Multiple Relaxation Times Constitutive Model and Mixed Subgrid-Scale Model

被引：0

作者：

Li, Jingfa ^{[1
,2
]}

Yu, Bo ^{[1
]}

Zhang, Xinyu ^{[3
]}

Sun, Shuyu ^{[2
]}

Sun, Dongliang ^{[1
]}

Zhang, Tao ^{[2
]}

机构：

[1] Beijing Inst Petrochem Technol, Sch Mech Engn, Beijing Key Lab Pipeline Crit Technol & Equipment, Beijing 102617, Peoples R China

[2] King Abdullah Univ Sci & Technol, Div Phys Sci & Engn, Computat Transport Phenomena Lab, Thuwal 239556900, Saudi Arabia

[3] Sinopec Int Petr Explorat & Prod Corp, Beijing 100029, Peoples R China

来源：

COMPUTATIONAL SCIENCE - ICCS 2018, PT III | 2018年 / 10862卷

基金：

中国国家自然科学基金;

关键词：

Large-eddy simulation; Turbulent drag-reducing flow; Viscoelastic fluid; Constitutive model; Subgrid-scale model; REDUCTION;

D O I：

10.1007/978-3-319-93713-7_14

中图分类号：

TP301 [理论、方法];

学科分类号：

081202 ;

摘要：

Due to complicated theological behaviors and elastic effect of viscoelastic fluids, only a handful of literatures reporting the large-eddy simulation (LES) studies on turbulent drag-reduction (DR) mechanism of viscoelastic fluids. In addition, these few studies are limited within the low Reynolds number situations. In this paper, LES approach is applied to further study the flow characteristics and DR mechanism of high Reynolds viscoelastic turbulent drag-reducing flow. To improve the accuracy of LES, an N-parallel I-ENE-P constitutive model based on multiple relaxation times and an improved mixed subgrid-scale (SGS) model are both utilized. DR rate and velocity fluctuations under different calculation parameters are analyzed. Contributions of different shear stresses on frictional resistance coefficient, and turbulent coherent structures which are closely related to turbulent burst events are investigated in details to further reveal the DR mechanism of high Reynolds viscoelastic turbulent drag-reducing flow. Especially, the different phenomena and results between high Reynolds and low Reynolds turbulent flows are addressed. This study is expected to provide a beneficial guidance to the engineering application of turbulent DR technology.

引用

页码：174 / 188

页数：15

共 16 条

[1]

BIRD RB, 1980, J NON-NEWTON FLUID, V7, P213, DOI 10.1016/0377-0257(80)85007-5

[2] A SIMPLE CONSTITUTIVE EQUATION FOR POLYMER FLUIDS BASED ON THE CONCEPT OF DEFORMATION-DEPENDENT TENSORIAL MOBILITY [J].