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A numerical study of flow around an impulsively started circular cylinder by a deterministic vortex method

Published online by Cambridge University Press:  26 April 2006

Chien-Cheng Chang  and
Ruey-Ling Chern
Chien-Cheng Chang
Affiliation:
Institute of Applied Mechanics, College of Engineering, National Taiwan University, Taipei 10764, Taiwan, R.O.C.
Ruey-Ling Chern
Affiliation:
Institute of Applied Mechanics, College of Engineering, National Taiwan University, Taipei 10764, Taiwan, R.O.C.
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Abstract

Impulsively started flow around a circular cylinder at various Reynolds numbers is studied by a deterministic hybrid vortex method. The key feature of the method consists in solving the viscous vorticity equation by interlacing a finite-difference method for diffusion and a vortex-in-cell method for convection. The vorticity is updated along the surface of the cylinder to satisfy the no-slip condition. The present method is basically different from previous applications of vortex methods, which are primarily in the context of random vortex algorithms. The Reynolds numbers of the flows under investigation range from 300 to 106. Numerical results are compared with analytical solutions at small times, and compared with finite-difference solutions and flow visualization results at relatively long times. Satisfactory agreement is found in the evolutions of the separation angles, wake lengths, surface pressure and drag coefficients, streamline patterns, and some velocities on the axis of symmetry behind the circular cylinder. The present hybrid vortex method is highly stable and suffers from little numerical diffusivity, yielding convincing numerical results for unsteady vortical flows at moderately high Reynolds numbers.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 233 , December 1991 , pp. 243 - 263
Copyright
© 1991 Cambridge University Press

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