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FLUENT 3d flow around a circular cylinder Re=100,000 |
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December 26, 2017, 09:03 |
FLUENT 3d flow around a circular cylinder Re=100,000
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#1 |
New Member
Jennifer Von
Join Date: Jun 2017
Posts: 9
Rep Power: 8 |
Hi everyone,
I'm running a 3D cylinder simulation in FLUENT with a Re of 100,000. I've used a Transition SST model with a time-step size of 5e-04 and 200,000 time steps. Pressure and velocity coupled scheme is PISO. y plus <1 ,so does that mean mesh is ok? I'm trying to obtain the drag coefficient from this simulation The results I've obtained shows an oscillatory motion, with the Cd value hitting a peak of 1.1 midway before falling back to 0.7 at the end of the 200,000 time steps. I used k-e model/SST but the results are not good. Can anyone tell me why has this occurred? What do I need to do for the Cd values to be stablised? Thanks! Regards, Jennifer |
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December 26, 2017, 13:02 |
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#2 |
Member
Leonardo
Join Date: Nov 2017
Posts: 37
Rep Power: 8 |
Hello Jennifer, could you post the Cd Report Plot? I am doing something similar for a 2D cylinder, by now I did for Re 10, 40, 100 and 200... and I am getting good results. I will model turbulence following this paper:
https://www.researchgate.net/publica...and_Validation I am still novice in CFD, but looks like 200,000 time steps is too much... following the paper I showed you I think 5000 would be enough. Also, what is your convergence criteria for each time step? I am keeping it in 10e-06 for unsteady, and setting a high number of max. iterations per time step, so it doesnt stop before. |
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December 26, 2017, 20:29 |
Thank you for your reply.
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#3 | |
New Member
Jennifer Von
Join Date: Jun 2017
Posts: 9
Rep Power: 8 |
Quote:
https://pan.baidu.com/s/1jHNYtkq |
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