Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Numerical computation of turbulent flow in a square sectioned $180^{\circ}$ bend by low-Reynolds-number second moment turbulence closure

저레이놀즈수 2차 모멘트 난류모형에 의한 정사각단면의 $180^{\circ}$ 곡덕트 난류유동의 수치해석

  • Sin, Jong-Geun (Dept.of Mechanical Engineering, Graduate School of Korea University) ;
  • Choe, Yeong-Don (Dept.of Mechanical Engineering, Korea University)
  • 신종근 (고려대학교 대학원 기계공학과) ;
  • 최영돈 (고려대학교 기계공학과)
  • Published : 1996.08.01
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Abstract

A new low Reynolds number nonlinear second moment turbulence closure was introduced to analyze a square sectioned 180.deg. bend flow. Inclusion of nonlinear return to isotropy term and cubic mean pressure strain term has brought out a marked improvement in the level of agreement with measured velocity profiles. Optimization of present closure was performed by comparison of computed velocity profiles with the experimental ones with variation of nonlinear return to isotropy term and quadratic and cubic pressure-strain model. Progressive vortex breakdown due to the interaction of primary and secondary flows was well captured by using the optimized second moment turbulence closure.

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