A piston movement simulation

mohammad · December 29, 2011, 23:23

Hi everybody,
I want to simulate a moving piston with a harmonic motion to pump the air.
In fact the FSI is not my case at all. All I wanna do is to simulate the resulting flow emerging from the piston harmonic movement as realistically as possible.
Is it possible to do such a simulation in CFX? and How should I set the BCs?

Regards

stumpy · January 5, 2012, 10:26

The ball valve tutorial in the CFX doc is a good place to start. This tutorial uses the 6-DOF solver to set the motion of a boundary. In your case you don't need to do that, instead you need to write a CEL expression for the motion and use this to set the motion of the piston boundary.

ghorrocks · January 8, 2012, 20:39

If the piston motion is known then simply do a moving mesh simulation. No need to do FSI or 6DOF.

December 29, 2011, 23:23	A piston movement simulation	#1
mohammad Senior Member mohammad Join Date: Dec 2010 Location: UK Posts: 245 Rep Power: 16	Hi everybody, I want to simulate a moving piston with a harmonic motion to pump the air. In fact the FSI is not my case at all. All I wanna do is to simulate the resulting flow emerging from the piston harmonic movement as realistically as possible. Is it possible to do such a simulation in CFX? and How should I set the BCs? Regards

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January 5, 2012, 10:26		#2
stumpy Senior Member Join Date: Apr 2009 Posts: 531 Rep Power: 21	The ball valve tutorial in the CFX doc is a good place to start. This tutorial uses the 6-DOF solver to set the motion of a boundary. In your case you don't need to do that, instead you need to write a CEL expression for the motion and use this to set the motion of the piston boundary.

January 8, 2012, 20:39		#3
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	If the piston motion is known then simply do a moving mesh simulation. No need to do FSI or 6DOF.