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-   -   UNSTEDY FLOW OVER A CIRCULAR CYLINDER (http://www.cfd-online.com/Forums/fluent/28193-unstedy-flow-over-circular-cylinder.html)

sanjib das sharma February 2, 2001 08:30

UNSTEDY FLOW OVER A CIRCULAR CYLINDER
 
Hi,I am stuck with a pretty easy problem!.I can't solve viscous flow over a circular cylinder..I'm not getting the Karman vortices,and vortex shedding....also the solution in the turbulence regime is not at all correct....any suggestions?????? Thanks to all who answers, Sanjib.

kenn February 6, 2001 02:27

Re: UNSTEDY FLOW OVER A CIRCULAR CYLINDER
 
what method are you using????

kenn February 6, 2001 02:28

Re: UNSTEDY FLOW OVER A CIRCULAR CYLINDER
 
sorry, I didn't notice this is Fluent section.

John C. Chien February 11, 2001 13:19

Re: UNSTEDY FLOW OVER A CIRCULAR CYLINDER
 
(1). If you don't know how to solve the problem, then you need to take a CFD course first and find out whether it is possible to solve the problem or not. (2). If the turbulence model is not giving you the correct answer, you need to do some research in turbulence modeling and find out whether you need to improve the model or not. (3). If you are using a commercial code, then you should get a sample case from the vendor first before you attempt to solve your problem. Ask the support engineer to show you how to solve your problem, otherwise, try some other codes or write your own.

Chetan Kadakia March 16, 2001 02:22

Re: UNSTEDY FLOW OVER A CIRCULAR CYLINDER
 
Does your solution converge? What are your boundary conditions? Which turbulence model did you choose?

sanjib das sharma March 16, 2001 02:49

Re: UNSTEDY FLOW OVER A CIRCULAR CYLINDER
 
Hi Chetan,

yes,the solution converged.the boundary conditions were,velocity inlet,pressure outlet,symmetry,and wall at the cylinder surface.the turbulence model is k-e. did you get the results?please inform if you did so.

Sanjib.


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