Karman vortex street ???

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 May 5, 2005, 07:29 Karman vortex street ??? #1 anisa Guest   Posts: n/a Hello everyone, I am calculating a flow above cylinder(diameter=2m) by laminar stream at Re=140. The inlet boundary is 8 diameters from cylinder, the outlet boundary is 20 diameters from cylinder. On inlet boundary I put a perturbation on speed Ux=U0+E*f(y) (where U0-the velocity at infinity, E~0.01*U0, f(y)=sin(2*PI*w*y/H), w~20,30, H-distance from bottom to up boundary of field). But I can get a Karman Vortex street, although an unsymmetric structures is arised. What I must to do to get a Karman vortex street? Thanks a lot for attention.

 May 5, 2005, 13:04 Re: Karman vortex street ??? #2 pUl| Guest   Posts: n/a You might want to refer to Fluents' latest Newsletter (Spring 2005). They have an article on how the new LES model gives enhanced results (comparable to DNS) for flow past a cylinder. PS: Needless to say their match with experiments is always perfect. It's like every simulation they do, they get it right