CFX Boundary Conditions Will Not Decouple

samuelhund · December 11, 2012, 15:41

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, 16:01

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, 15:41	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?

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December 11, 2012, 16:01		#2
cdegroot Senior Member Chris DeGroot Join Date: Nov 2011 Location: Canada Posts: 414 Rep Power: 17	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.