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Numerical simulation of shear effect on vortex shedding behind a square cylinder
Author(s) -
Hwang Robert R.,
Sue Y. C.
Publication year - 1997
Publication title -
international journal for numerical methods in fluids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 112
eISSN - 1097-0363
pISSN - 0271-2091
DOI - 10.1002/(sici)1097-0363(19971230)25:12<1409::aid-fld622>3.0.co;2-n
Subject(s) - strouhal number , vortex shedding , mechanics , reynolds number , drag , physics , drag coefficient , shear flow , lift (data mining) , vortex , classical mechanics , cylinder , lift coefficient , mathematics , turbulence , geometry , computer science , data mining
This paper is concerned with the numerical simulation of the flow structure around a square cylinder in a uniform shear flow. The calculations were conducted by solving the unsteady 2D Navier–Stokes equations with a finite difference method. The effect of the shear parameter K of the approaching flow on the vortex‐shedding Strouhal number and the force coefficients acting on the square cylinder is investigated in the range K =0·0–0·25 at various Reynolds numbers from 500 to 1500. The computational results are compared with some existing experimental data and previous studies. The effect of shear rate on the Strouhal number and the force acting on the cylinder has a tendency to reduce the oscillation. The Strouhal number, mean drag and amplitude of the fluctuating force tend to decrease as the shear rate increases, but show no significant change at low shear rate. Increasing the Reynolds number decreases the Strouhal number and increases the force acting on the cylinder. At high shear rate the shedding frequencies of the fluctuating drag and lift coefficients are identical. © 1997 John Wiley & Sons, Ltd.