Numerical simulation of shear effect on vortex shedding behind a square cylinder

✍ Scribed by Robert R. Hwang; Y. C. Sue

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 231 KB
• Volume: 25
• Category: Article
• ISSN: 0271-2091
• DOI: 10.1002/(sici)1097-0363(19971230)25:12<1409::aid-fld622>3.0.co;2-n

✦ Synopsis

This paper is concerned with the numerical simulation of the ¯ow structure around a square cylinder in a uniform shear ¯ow. The calculations were conducted by solving the unsteady 2D Navier±Stokes equations with a ®nite difference method. The effect of the shear parameter K of the approaching ¯ow on the vortex-shedding Strouhal number and the force coef®cients acting on the square cylinder is investigated in the range K 0Á0±0Á25 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 ¯uctuating force tend to decrease as the shear rate increases, but show no signi®cant 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 ¯uctuating drag and lift coef®cients are identical.