unsteady external force

colorforadollar · August 13, 2010, 13:39

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, 16:38

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, 13:39	unsteady external force	#1
colorforadollar New Member Tim Join Date: Aug 2010 Posts: 3 Rep Power: 15	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?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
CGNS Compiling	Diego	Main CFD Forum	17	December 21, 2014 01:40
External force and moment	Longines	STAR-CCM+	1	June 30, 2010 08:00
Force report every iteration in unsteady flow calculation	Friso Landstra	FLUENT	0	October 23, 2009 07:13
Monitor Force in Unsteady Flow	Sham	FLUENT	1	August 4, 2007 05:39
Monitoring Force (Unsteady)	Emmanuel	FLUENT	0	July 9, 2007 18:42

August 16, 2010, 16:38		#2
f-w Senior Member Join Date: Apr 2009 Posts: 154 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