Chang, Chien-ChengChien-ChengChangRUEY-LIN CHERN2009-01-212018-06-292009-01-212018-06-29199100221120http://ntur.lib.ntu.edu.tw//handle/246246/107121https://www.scopus.com/inward/record.uri?eid=2-s2.0-0026368986&doi=10.1017%2fS0022112091000472&partnerID=40&md5=3f196ef920e26079a2ce48a31303c29cImpulsively 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. © 1991, Cambridge University Press. All rights reserved.application/pdf1814013 bytesapplication/pdfen-USFlow of Fluids--Vortex Flow; Fluid Dynamics; Mathematical Techniques--Finite Difference Method; Deterministic Vortex Methods; Impulsively Started Flows; Flow of Fluidsjournal article10.1017/S00221120910004722-s2.0-0026368986http://ntur.lib.ntu.edu.tw/bitstream/246246/107121/1/02.pdf