CFX Boundary Conditions Will Not Decouple

samuelhund · December 11, 2012, 16:41

I'm using Ansys Workbench to design a axial flow pump. I have coupled blade gen to turbogrid to cfx in the workbench. I open the CFX setup cell (which launches CFZ-Pre). When I go to the Default Domain: Default Domain Default where it allows me to change the boundary conditions in the Boundary: Default Domain Default tab. The default value for all boundaries is Wall. I select inflow passage and change that to inlet. However, every thing else likewise becomes an inlet. I've fixed this problem once before, but I cannot remember how. Can any one help?

cdegroot · December 11, 2012, 17:01

You can delete your "Default Domain" boundary condition and start over defining the boundaries you actually want individually.

Alternatively, under "Case Options" -> "General" you can turn off "Automatic Default Domain". Problem is, if you are using Workbench, the mesh is already loaded when Pre is launched. Therefore, I would try opening CFX-Pre separately first and setting this as default for the next time it is launched through Workbench.

I think this will fix the problem you are having. First option is easiest, but second option is useful if you have many similar cases where this could be an issue.

December 11, 2012, 16:41	CFX Boundary Conditions Will Not Decouple	#1
samuelhund New Member Samuel J. Hund Join Date: Dec 2012 Posts: 2 Rep Power: 0	I'm using Ansys Workbench to design a axial flow pump. I have coupled blade gen to turbogrid to cfx in the workbench. I open the CFX setup cell (which launches CFZ-Pre). When I go to the Default Domain: Default Domain Default where it allows me to change the boundary conditions in the Boundary: Default Domain Default tab. The default value for all boundaries is Wall. I select inflow passage and change that to inlet. However, every thing else likewise becomes an inlet. I've fixed this problem once before, but I cannot remember how. Can any one help?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Wind turbine simulation	Saturn	CFX	60	July 17, 2024 06:45
Implementation of boundary conditions for FVM	Tom	Main CFD Forum	7	August 26, 2014 06:58
ribbed channel / simpleFoam / boundary conditions	beeo	OpenFOAM Pre-Processing	20	July 17, 2013 09:39
An error has occurred in cfx5solve:	volo87	CFX	5	June 14, 2013 18:44
Water subcooled boiling	Attesz	CFX	7	January 5, 2013 04:32

December 11, 2012, 17:01		#2
cdegroot Senior Member Chris DeGroot Join Date: Nov 2011 Location: Canada Posts: 414 Rep Power: 18	You can delete your "Default Domain" boundary condition and start over defining the boundaries you actually want individually. Alternatively, under "Case Options" -> "General" you can turn off "Automatic Default Domain". Problem is, if you are using Workbench, the mesh is already loaded when Pre is launched. Therefore, I would try opening CFX-Pre separately first and setting this as default for the next time it is launched through Workbench. I think this will fix the problem you are having. First option is easiest, but second option is useful if you have many similar cases where this could be an issue.