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-   -   How to see lauch of swirls inside a turbulent flow (http://www.cfd-online.com/Forums/fluent/43100-how-see-lauch-swirls-inside-turbulent-flow.html)

Greg December 12, 2006 05:02

How to see lauch of swirls inside a turbulent flow
 
Hello everybody,

I would like to compute the torque on a flap but there are strong oscillations in the total moment reported by Fluent. I guess that there are some unsteady phenomenas convected, such as lauch of swirls around the flap that could probably explain these oscillations but i need to proove it by a transcient calculation. The problem is that it seems difficult to have and idea of a time and spatial scale of swirls to refine the grid around the flap and to define an appropriate time step. I use a K-w SST Rans model and i first try to see these unsteady phenomenas with a 2D simulation.

So my question is : how to define an appropriate time step and a correct spatial discretization in order to see swirls lauch around the flap ?

Thanks a lot for your explanations and advices, Regards Greg



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