Vortex flow

tadevilas · January 1, 2019, 22:32

Hello sir,
I'm trying to do the simulation for vortex flow with trapezoidal bluff body. I do same as the tutorial provided for the Cylindrical bluff body but I'm not able to see the formation of vortices.
Geometry details (2D): D=25mm, d(width)=7mm, velocity=1mps, strouhal number=0.30

Hamidzoka · January 1, 2019, 23:53

Hi;
If your run case is steady vortex flow can not be resolved.
Detecting the vortex behind the bodies needs unsteady CFD simulation.

regards

tadevilas · January 2, 2019, 07:22

Yes sir. I tried for unsteady also. But no get results..

AliE · January 4, 2019, 15:01

It is not easy to guess an answer without details, but usually the vortex are not detected for two main reasons:
- your mesh is not resolved enough, as already suggested
- your turbulence model is badly set or you are not using it at all ( and your mesh is not fine enough for a dns)
A picture of yoir doman and the Re number you are using might help.

tadevilas · January 12, 2019, 06:15

Thanks sir. I have done with fine mesh. But same not able to see the vortices.

Sir can you give your email.
I'll send you a case and data file.
Can you please see it

January 1, 2019, 22:32	Vortex flow	#1
tadevilas New Member Vilas Join Date: Oct 2018 Location: Pune maharashtra,india Posts: 13 Rep Power: 7	Hello sir, I'm trying to do the simulation for vortex flow with trapezoidal bluff body. I do same as the tutorial provided for the Cylindrical bluff body but I'm not able to see the formation of vortices. Geometry details (2D): D=25mm, d(width)=7mm, velocity=1mps, strouhal number=0.30

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January 1, 2019, 23:53		#2
Hamidzoka Senior Member Hamid Zoka Join Date: Nov 2009 Posts: 282 Rep Power: 18	Hi; If your run case is steady vortex flow can not be resolved. Detecting the vortex behind the bodies needs unsteady CFD simulation. regards

January 2, 2019, 07:22		#3
tadevilas New Member Vilas Join Date: Oct 2018 Location: Pune maharashtra,india Posts: 13 Rep Power: 7	Yes sir. I tried for unsteady also. But no get results..

January 4, 2019, 15:01		#4
AliE Senior Member Join Date: Dec 2017 Posts: 153 Rep Power: 8	It is not easy to guess an answer without details, but usually the vortex are not detected for two main reasons: - your mesh is not resolved enough, as already suggested - your turbulence model is badly set or you are not using it at all ( and your mesh is not fine enough for a dns) A picture of yoir doman and the Re number you are using might help.

January 12, 2019, 06:15		#5
tadevilas New Member Vilas Join Date: Oct 2018 Location: Pune maharashtra,india Posts: 13 Rep Power: 7	Thanks sir. I have done with fine mesh. But same not able to see the vortices. Sir can you give your email. I'll send you a case and data file. Can you please see it