unsteady external force

colorforadollar · August 13, 2010, 14:39

I'm a long time CFD user but just recently switched over to STAR-CCM+ for this particular project. I need to evaluate it's response to an external force, however, this force is unsteady. I have a discrete time-history or I can parametrize it as a function.

Can STAR-CCM+ handle an unsteady function in the force vector? How do I specify it, I haven't noticed any ability to include UDFs like in CFX or Fluent?

f-w · August 16, 2010, 17:38

Haven't actually done it, but looks like the capability is there. You should be able to reference a user field function in the direction and position fields of the force vector properties.

More on referencing functions:
Using Tools > Using Field Functions > Field Function Programming Reference > Referencing Field Functions

More on getting current time (for your custom field function):
http://www.cfd-online.com/Forums/sta...tion-step.html

August 13, 2010, 14:39	unsteady external force	#1
colorforadollar New Member Tim Join Date: Aug 2010 Posts: 3 Rep Power: 16	I'm a long time CFD user but just recently switched over to STAR-CCM+ for this particular project. I need to evaluate it's response to an external force, however, this force is unsteady. I have a discrete time-history or I can parametrize it as a function. Can STAR-CCM+ handle an unsteady function in the force vector? How do I specify it, I haven't noticed any ability to include UDFs like in CFX or Fluent?

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August 16, 2010, 17:38		#2
f-w Senior Member Join Date: Apr 2009 Posts: 159 Rep Power: 17	Haven't actually done it, but looks like the capability is there. You should be able to reference a user field function in the direction and position fields of the force vector properties. More on referencing functions: Using Tools > Using Field Functions > Field Function Programming Reference > Referencing Field Functions More on getting current time (for your custom field function): http://www.cfd-online.com/Forums/sta...tion-step.html