pressure transient term?

Romek · April 17, 2011, 22:08

can someone explain the pressure transient term to me (which can be checked when thermal energy model is selected)? or give me a link? i searched for some info but didnt find an explanation. also the ansys documentary which normally has everything i need didnt provide a description.

i am trying to simulate oil flow through bearings. I am using the SST model (ansys cfx 13). But i dont know if i need the pressure transient term or not.

thanks!

siw · April 19, 2011, 13:03

I would also like to know about this term.

Couldn't find any option to check it on/off, though. Where would that be exactly?

Romek · April 19, 2011, 20:55

In CFX-Pre...

Set Analysis Mode to transient.
In the Fluid-Models Tab of a Domain -> Set Heat Transfer to Thermal Energy -> Then it should appear directly under this option.

What's strange is when you turn the pressure transient term on a new box appears where you can turn it on again. Does that make sense?!

Using Ansys 13.0...

Just noticed with pressure transient term on (both options on), my system pressure is almost the same but the temperature-change in the system changes significantly.

ghorrocks · April 19, 2011, 21:14

The pressure transient term of which model?

Romek · April 19, 2011, 21:19

thermal energy heat transfer model

April 17, 2011, 22:08	pressure transient term?	#1
Romek New Member Join Date: Mar 2011 Posts: 13 Rep Power: 15	can someone explain the pressure transient term to me (which can be checked when thermal energy model is selected)? or give me a link? i searched for some info but didnt find an explanation. also the ansys documentary which normally has everything i need didnt provide a description. i am trying to simulate oil flow through bearings. I am using the SST model (ansys cfx 13). But i dont know if i need the pressure transient term or not. thanks!

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April 19, 2011, 13:03		#2
siw Senior Member Stuart Join Date: Jul 2009 Location: Portsmouth, England Posts: 733 Rep Power: 25	I would also like to know about this term. Couldn't find any option to check it on/off, though. Where would that be exactly?

April 19, 2011, 20:55		#3
Romek New Member Join Date: Mar 2011 Posts: 13 Rep Power: 15	In CFX-Pre... Set Analysis Mode to transient. In the Fluid-Models Tab of a Domain -> Set Heat Transfer to Thermal Energy -> Then it should appear directly under this option. What's strange is when you turn the pressure transient term on a new box appears where you can turn it on again. Does that make sense?! Using Ansys 13.0... Just noticed with pressure transient term on (both options on), my system pressure is almost the same but the temperature-change in the system changes significantly.

April 19, 2011, 21:14		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	The pressure transient term of which model?

April 19, 2011, 21:19		#5
Romek New Member Join Date: Mar 2011 Posts: 13 Rep Power: 15	thermal energy heat transfer model