# Lid-Driven-Cavity (thermodyn. equation of state)?

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 March 17, 2014, 10:48 Lid-Driven-Cavity (thermodyn. equation of state)? #1 New Member   Simone Oz Join Date: Mar 2014 Posts: 4 Rep Power: 4 Hi there, I am new here and I have a generall question...actually I have a problem lol I dont need any derivations just the equation for: I need the thermodynamic equation of state for the Lid-Driven-Cavity. thx in advance. God bless you, Lisa-Simone

March 17, 2014, 12:51
#2
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Filippo Maria Denaro
Join Date: Jul 2010
Posts: 2,695
Rep Power: 33
Quote:
 Originally Posted by Simonee Hi there, I am new here and I have a generall question...actually I have a problem lol I dont need any derivations just the equation for: I need the thermodynamic equation of state for the Lid-Driven-Cavity. thx in advance. God bless you, Lisa-Simone

you question is not clear...if you are resolving standard lid-driven cavity for incompressible flows, there is no thermodinamic equation of state.
For incompressible flow, the pressure is not a thermodinamic function

 March 17, 2014, 15:38 #3 New Member   Simone Oz Join Date: Mar 2014 Posts: 4 Rep Power: 4 Thank you for your message. hmm...I don't know. And is there any thermodynamic equation of state for the Lid-Driven-Cavity for a compressible flow? If yes, share this equation please Thx, Simone

 March 17, 2014, 16:02 #4 Senior Member   cfdnewbie Join Date: Mar 2010 Posts: 557 Rep Power: 12 The equation of state for a perfect gas is p=\rho R T, which applies (as the name suggests) to "massless" gas at moderate temperature (no dissociation, chemical reaction) etc. So it all depends on what fluid you want to simulate.... the problem itself (the lid driven cavity) is independent of the EOS, in fact, you could try to solve it for honey, given that you have the correct EOS. In that sense, your question doesn't make much sense to me, as it relates two "independent" fields (the flow problem and the fluid)! Simonee likes this.

 March 18, 2014, 07:34 #5 New Member   Simone Oz Join Date: Mar 2014 Posts: 4 Rep Power: 4 thank you guys, you were right! It was just the equation of state for a perfect gas

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