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Numerical Analyzing for Influence of Different Cases of Upstream Flow Velocity on Turbulent Backflow Above the Top of the Cube

MI Hai-rong, GAO Ye   

  1. College of Civil Engineering, Harbin Engineering University, Harbin 150001,China
  • Received:2007-03-01 Revised:1900-01-01 Online:2007-07-26 Published:2007-07-26
  • Contact: MI Hai-rong

Abstract: Different cases of upstream flow were investigated and the occurring conditions of separation, separation degree, and attachment in the frontal face of the cube were analyzed. Based on the comparison of the experimental data, occurring conditions of backflow and attachment, which were analyzed using standard k-ε model, the attachment length ZR are directly related with the upstream flow velocity u, the equation is u= y1/m.When m is decreases, the ZR increases. When m is larger than 7, there is a strong separation above the top of the cube, but no attachment, ZR is over 1.0.

Key words: turbulent, upstream flow velocity, separation, attachment

CLC Number: 

  • TV131.2
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