Large-eddy simulation of MHD turbulent duct flows using a dynamic subgrid-scale model

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

At low magnetic Reynolds number, turbulent duct flows in a uniform magnetic field are examined using large-eddy simulation to reveal a sidewall effect on the skin friction. The duct has a square cross section and entirely insulated walls. The duct flow has two kinds of boundary layers: Hartmann layer and sidewall layer. The Hartmann layer is located on the wall perpendicular to the magnetic field, while the sidewall layer exists on the wall parallel to the magnetic field. As the magnetic field increases in the range of turbulent flows, the Hartmann layer becomes thin because of the "Hartmann flattening" -flattening effect of the flow by the Lorentz force. The sidewall layer, however, becomes thick because of the turbulence suppression until the laminarization takes place. When the Reynolds number Re based on the hydraulic diameter, molecular viscosity, and bulk velocity is 5300, the Hartmann and sidewall layers are laminarized at the same Hartmann number that is proportional to the magnetic field. When the Hartmann layer is laminarized at Re = 29000, the sidewall layer remains turbulence. This allows the skin friction to become maximum. When the sidewall layer is laminarized, the flow totally becomes laminar and the skin friction becomes minimum.

本文言語English
ホスト出版物のタイトルCollection of Technical Papers - 38th AIAA Plasmadynamics and Lasers Conference
出版社American Institute of Aeronautics and Astronautics Inc.
ページ688-704
ページ数17
ISBN(印刷版)1563479001, 9781563479007
DOI
出版ステータスPublished - 2007
イベント38th AIAA Plasmadynamics and Lasers Conference - Miami, FL, United States
継続期間: 2007 6月 252007 6月 28

出版物シリーズ

名前Collection of Technical Papers - 38th AIAA Plasmadynamics and Lasers Conference
2

Other

Other38th AIAA Plasmadynamics and Lasers Conference
国/地域United States
CityMiami, FL
Period07/6/2507/6/28

ASJC Scopus subject areas

  • 電子工学および電気工学
  • 凝縮系物理学

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