CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLUENT

Incompressible Ideal Gaz in a closed system - Help

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   July 31, 2008, 07:53
Default Incompressible Ideal Gaz in a closed system - Help
  #1
JB
Guest
 
Posts: n/a
Hey everyone,

Can you think of any example where it can be relevant to use the Incompressible Ideal Gaz density formulation together with a closed system, and run a transient simulation where you heat up the system?

I'm just curious (I've tried it, it doesn't crash, but my results do not make any sense: some mass seem to disapear from my closed system, and ALL my particles are moving towards the cold reagion, i.e. no recirculation... what's happening??)

Thanks a lot for your insight. /JB
  Reply With Quote

Old   July 31, 2008, 14:56
Default Re: Incompressible Ideal Gaz in a closed system -
  #2
Emmanuel Resch
Guest
 
Posts: n/a
prob something to do with the boundaries... how do you have them set?
  Reply With Quote

Old   August 1, 2008, 04:16
Default Re: Incompressible Ideal Gaz in a closed system -
  #3
JB
Guest
 
Posts: n/a
my test case is very simple: it's a square (2d model). 3 walls out of 4 are adiabatic. the 4th wall has a fixed temperature. I initialize the solution with an homogemeous lower temperature, and then run a transient analysis.

The tank heats up, but the velocity results do not make any sense to me.

Again, maybe it's just dumb to use IIG density formulation in a closed tank. But once again, I'd like to understand what's happening... do I need to go through a 500 page book for that, or do you guys have an OK simple explanation for me?

Thanks /JB
  Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Incompressible Ideal gas law Leverkin FLUENT 5 March 5, 2009 17:41
Ideal system configuration for fluent hari FLUENT 0 November 8, 2007 00:17
Combustion in a closed System Martin Castillo FLUENT 3 June 20, 2007 21:38
difference between ideal gas and incompressible? Ric Main CFD Forum 1 March 24, 2007 13:07
closed system calculation Neil MacLeod Main CFD Forum 1 May 13, 1999 15:47


All times are GMT -4. The time now is 11:04.