Direct numerical simulation of elastic turbulence and its mixing-enhancement effect in a straight channel flow

In this paper,we present a direct numerical simulation（DNS） of elastic turbulence of viscoelastic fluid at vanishingly low Reynolds number（Re = 1） in a three-dimensional straight channel flow for the first time,using the Giesekus constitutive model for the fluid.In order to generate and maintain the...

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Bibliographic Details
Published inChinese physics B Vol. 22; no. 2; pp. 320 - 327
Main Author 张红娜 李凤臣 曹阳 Kunugi Tomoaki 宇波
Format Journal Article
LanguageEnglish
Published 01.02.2013
Subjects
Computational fluid dynamics
Direct numerical simulation
Fluid flow
Fluids
Mathematical models
Straight channels
Turbulence
Turbulent flow
低雷诺数
本构模型
流体运动
混合增强
湍流
直接数值模拟
通道
黏弹性流体
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Summary:In this paper,we present a direct numerical simulation（DNS） of elastic turbulence of viscoelastic fluid at vanishingly low Reynolds number（Re = 1） in a three-dimensional straight channel flow for the first time,using the Giesekus constitutive model for the fluid.In order to generate and maintain the turbulent fluid motion in the straight channel,a sinusoidal force term is added to the momentum equation,and then the elastic turbulence is numerically realized with an initialized chaotic velocity field and a stretched conformation field.Statistical and structural characteristics of the elastic turbulence therein are analyzed based on the detailed information obtained from the DNS.The fluid mixing enhancement effect of elastic turbulence is also demonstrated for the potential applications of this phenomenon.
Bibliography:Zhang Hong-Na , Li Feng-Chen , Cao Yang , Kunugi Tomoaki , Yu Bo（1） School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China ;2 ） Department of Nuclear Engineering, Kyoto University, Kyoto, 606-8501, Japan ;3） Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, China University of Petroleum-Beijing, Beijing 102249, China
11-5639/O4
elastic turbulence,viscoelastic fluid,direct numerical simulation,mixing enhancement
In this paper,we present a direct numerical simulation（DNS） of elastic turbulence of viscoelastic fluid at vanishingly low Reynolds number（Re = 1） in a three-dimensional straight channel flow for the first time,using the Giesekus constitutive model for the fluid.In order to generate and maintain the turbulent fluid motion in the straight channel,a sinusoidal force term is added to the momentum equation,and then the elastic turbulence is numerically realized with an initialized chaotic velocity field and a stretched conformation field.Statistical and structural characteristics of the elastic turbulence therein are analyzed based on the detailed information obtained from the DNS.The fluid mixing enhancement effect of elastic turbulence is also demonstrated for the potential applications of this phenomenon.
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/22/2/024703