Vortex flow

tadevilas · January 1, 2019, 23:32

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 2, 2019, 00:53

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, 08:22

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

AliE · January 4, 2019, 16:01

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, 07:15

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, 23:32	Vortex flow	#1
tadevilas New Member Vilas Join Date: Oct 2018 Location: Pune maharashtra,india Posts: 13 Rep Power: 8	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

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Issues on the simulation of high-speed compressible flow within turbomachinery	dowlee	OpenFOAM Running, Solving & CFD	11	August 6, 2021 07:40
Flow meter Design	CD adapco Group Marketing	Siemens	3	June 21, 2011 09:33
Vortex Mehtod : Internal flow	MC Ryu	Main CFD Forum	6	June 22, 2005 23:07
Inviscid Drag at subsonic, subcritical Mach #	Axel Rohde	Main CFD Forum	1	November 19, 2001 13:19
computation about flow around a yawed cone	Tylor Xie	Main CFD Forum	0	June 9, 1999 08:33

January 2, 2019, 00:53		#2
Hamidzoka Senior Member Hamid Zoka Join Date: Nov 2009 Posts: 293 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, 08:22		#3
tadevilas New Member Vilas Join Date: Oct 2018 Location: Pune maharashtra,india Posts: 13 Rep Power: 8	Yes sir. I tried for unsteady also. But no get results..

January 4, 2019, 16:01		#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, 07:15		#5
tadevilas New Member Vilas Join Date: Oct 2018 Location: Pune maharashtra,india Posts: 13 Rep Power: 8	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