Relative pressure in compressible flow

dotapro · June 18, 2015, 23:08

Let say the domain reference pressure is 1 atm (atmospheric pressure). May I know the input value of relative pressure if I change the flow from subsonic to supersonic (k-epsilon model)? Is it equals to 0 Pa or pressure of that particular equipment during release?

ghorrocks · June 19, 2015, 05:36

It depends on the flow configuration, so your question is unanswerable. It sounds like you need to do some reading about compressible flow as your question is probably a standard compressible flow equation.

Also the reference pressure is used to reduce numerical round off errors in the simulation. It tells you nothing about the flow conditions.

June 18, 2015, 23:08	Relative pressure in compressible flow	#1
dotapro Member Join Date: Oct 2013 Location: Malaysia Posts: 39 Rep Power: 12	Let say the domain reference pressure is 1 atm (atmospheric pressure). May I know the input value of relative pressure if I change the flow from subsonic to supersonic (k-epsilon model)? Is it equals to 0 Pa or pressure of that particular equipment during release?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Compressible Flow Pressure Outlet Back Flow	okstatecheme	OpenFOAM Running, Solving & CFD	1	March 21, 2018 08:11
Inlet and Outlet Pressure condition for Compressible Flow in FLUENT	rsdsaurav	FLUENT	1	May 17, 2015 14:19
Pressure contours in two compressible phase flow	Hershey	Fluent Multiphase	1	June 6, 2014 07:41
Compressible, turbulent flow in a pressure tube	Mario	FLUENT	2	August 9, 2005 01:47
what the result is negatif pressure at inlet	chong chee nan	FLUENT	0	December 29, 2001 05:13

June 19, 2015, 05:36		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	It depends on the flow configuration, so your question is unanswerable. It sounds like you need to do some reading about compressible flow as your question is probably a standard compressible flow equation. Also the reference pressure is used to reduce numerical round off errors in the simulation. It tells you nothing about the flow conditions.