中国物理B ›› 2016, Vol. 25 ›› Issue (9): 94701-094701.doi: 10.1088/1674-1056/25/9/094701

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Characteristics and generation of elastic turbulence in a three-dimensional parallel plate channel using direct numerical simulation

Hong-Na Zhang(张红娜), Feng-Chen Li(李凤臣), Xiao-Bin Li(李小斌), Dong-Yang Li(李东阳), Wei-Hua Cai(蔡伟华), Bo Yu(宇波)   

  1. 1. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
    2. Beijing Institute of Petrochemical Technology, Beijing 102617, China
  • 收稿日期:2016-03-18 修回日期:2016-04-19 出版日期:2016-09-05 发布日期:2016-09-05
  • 通讯作者: Xiao-Bin Li, Wei-Hua Cai E-mail:lixb@hit.edu.cn;caiwh@hit.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 51276046 and 51506037), the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (Grant No. 51421063), the China Postdoctoral Science Foundation (Grant No. 2016M591526), the Heilongjiang Postdoctoral Fund, China (Grant No. LBH-Z15063), and the China Postdoctoral International Exchange Program.

Characteristics and generation of elastic turbulence in a three-dimensional parallel plate channel using direct numerical simulation

Hong-Na Zhang(张红娜)1, Feng-Chen Li(李凤臣)1, Xiao-Bin Li(李小斌)1, Dong-Yang Li(李东阳)1, Wei-Hua Cai(蔡伟华)1, Bo Yu(宇波)2   

  1. 1. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
    2. Beijing Institute of Petrochemical Technology, Beijing 102617, China
  • Received:2016-03-18 Revised:2016-04-19 Online:2016-09-05 Published:2016-09-05
  • Contact: Xiao-Bin Li, Wei-Hua Cai E-mail:lixb@hit.edu.cn;caiwh@hit.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 51276046 and 51506037), the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (Grant No. 51421063), the China Postdoctoral Science Foundation (Grant No. 2016M591526), the Heilongjiang Postdoctoral Fund, China (Grant No. LBH-Z15063), and the China Postdoctoral International Exchange Program.

摘要:

Direct numerical simulations (DNSs) of purely elastic turbulence in rectilinear shear flows in a three-dimensional (3D) parallel plate channel were carried out, by which numerical databases were established. Based on the numerical databases, the present paper analyzed the structural and statistical characteristics of the elastic turbulence including flow patterns, the wall effect on the turbulent kinetic energy spectrum, and the local relationship between the flow motion and the microstructures' behavior. Moreover, to address the underlying physical mechanism of elastic turbulence, its generation was presented in terms of the global energy budget. The results showed that the flow structures in elastic turbulence were 3D with spatial scales on the order of the geometrical characteristic length, and vortex tubes were more likely to be embedded in the regions where the polymers were strongly stretched. In addition, the patterns of microstructures' elongation behave like a filament. From the results of the turbulent kinetic energy budget, it was found that the continuous energy releasing from the polymers into the main flow was the main source of the generation and maintenance of the elastic turbulent status.

关键词: elastic turbulence, viscoelastic fluid, direct numerical simulation, rectilinear shear flow

Abstract:

Direct numerical simulations (DNSs) of purely elastic turbulence in rectilinear shear flows in a three-dimensional (3D) parallel plate channel were carried out, by which numerical databases were established. Based on the numerical databases, the present paper analyzed the structural and statistical characteristics of the elastic turbulence including flow patterns, the wall effect on the turbulent kinetic energy spectrum, and the local relationship between the flow motion and the microstructures' behavior. Moreover, to address the underlying physical mechanism of elastic turbulence, its generation was presented in terms of the global energy budget. The results showed that the flow structures in elastic turbulence were 3D with spatial scales on the order of the geometrical characteristic length, and vortex tubes were more likely to be embedded in the regions where the polymers were strongly stretched. In addition, the patterns of microstructures' elongation behave like a filament. From the results of the turbulent kinetic energy budget, it was found that the continuous energy releasing from the polymers into the main flow was the main source of the generation and maintenance of the elastic turbulent status.

Key words: elastic turbulence, viscoelastic fluid, direct numerical simulation, rectilinear shear flow

中图分类号:  (Viscous and viscoelastic instabilities)

  • 47.20.Gv
47.27.ek (Direct numerical simulations) 47.27.Cn (Transition to turbulence)