Setting up Flow around a Wing Simulation help

Atella · January 2, 2010, 08:50

Hi,
I am trying to model the flow around a wing in order to measure the lift and drag forces at different angles of attack.
At present I am using CFX through the ANSYS Workbench application. I am pretty new to all this and I am struggling when it comes to setting the domains.
At present I have modelled my wing in CATIA and modelled a domain around the wing. Once I load this into CFX it recognises this as 2 bodies. I am able to specify the inlet, outlet and walls of the domain and I set the wing as solid but once I have run the simulation the flow doesn’t seem to flow through the domain and around the wing, just straight through with no deviation.
Does anyone know what I could be doing wrong? Do I need to model the domain separately in ANSYS?
Thanks for your help

Baldy · January 3, 2010, 00:05

Get rid of your wing domain. You should only keep the fluid domain.

Set the surface of the wing cutout as a no-slip wall.

Atella · January 3, 2010, 07:47

Thanks for the reply.

When i setup the problem using only one domain i get an error when solving it
stating that "2 isolated fluid regions were found in domain Default Domain"

Would anyone know why this is occuring or how to solve this? I think it is because I have 2 bodies imported, the wing cutout and the windtunnel domain. Would this problem be solved if i just imported the wing geometry and created a domain in the design modeller section of workbench?

If not anyone know how i could get around this?

Thanks for your help!

Baldy · January 3, 2010, 12:51

I always use the Enclosure feature in Workbench to make my fluid domains. Don't forget to suppress your solid bodies before importing them in CFX.

January 2, 2010, 08:50	Setting up Flow around a Wing Simulation help	#1
Atella New Member Join Date: Jan 2010 Posts: 8 Rep Power: 16	Hi, I am trying to model the flow around a wing in order to measure the lift and drag forces at different angles of attack. At present I am using CFX through the ANSYS Workbench application. I am pretty new to all this and I am struggling when it comes to setting the domains. At present I have modelled my wing in CATIA and modelled a domain around the wing. Once I load this into CFX it recognises this as 2 bodies. I am able to specify the inlet, outlet and walls of the domain and I set the wing as solid but once I have run the simulation the flow doesn’t seem to flow through the domain and around the wing, just straight through with no deviation. Does anyone know what I could be doing wrong? Do I need to model the domain separately in ANSYS? Thanks for your help

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January 3, 2010, 00:05		#2
Baldy New Member Join Date: Mar 2009 Posts: 22 Rep Power: 17	Get rid of your wing domain. You should only keep the fluid domain. Set the surface of the wing cutout as a no-slip wall.

January 3, 2010, 07:47		#3
Atella New Member Join Date: Jan 2010 Posts: 8 Rep Power: 16	Thanks for the reply. When i setup the problem using only one domain i get an error when solving it stating that "2 isolated fluid regions were found in domain Default Domain" Would anyone know why this is occuring or how to solve this? I think it is because I have 2 bodies imported, the wing cutout and the windtunnel domain. Would this problem be solved if i just imported the wing geometry and created a domain in the design modeller section of workbench? If not anyone know how i could get around this? Thanks for your help!

January 3, 2010, 12:51		#4
Baldy New Member Join Date: Mar 2009 Posts: 22 Rep Power: 17	I always use the Enclosure feature in Workbench to make my fluid domains. Don't forget to suppress your solid bodies before importing them in CFX.