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How to see lauch of swirls inside a turbulent flow |
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December 12, 2006, 05:02 |
How to see lauch of swirls inside a turbulent flow
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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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