gas nozzle in vacuum chamber

paolo.pizzol · January 22, 2016, 09:53

Hi all!

To start off, I'm very new to Openfoam.

My problem: I am trying to simulate a gas (Argon) entering a vacuum chamber (pressure in the mbar range, 1 - 10 mbar) at a certain speed (or mass flow, whichever).

I'm starting with simple geometries (pipe, nozzle on one side, outlet on the opposite side) but so far I've had no luck.

Which solver should I use? Boundary conditions?

Any help is of course appreciated!

Thanks!

Paolo

chirag · January 22, 2016, 12:01

Hi Paolo,
I am also working with similar problem. I could simulate flow in vacuum chamber but I still have some problems.
I have used rhoCentralFoam and pisoCentralFoam.
My simulation used to diverge as numerically pressure used to go below 0 pa. So i limited it to 0.000001 pa in the solver.
In both the cases, I have observed is that I get a strage velocity profile near the shock region. I performed a fluent simulation on same geometry but this problem is not observed.
May be someone can help out.
link for my thread with the files attached in it!
http://www.cfd-online.com/Forums/ope...ntralfoam.html
Thanks!
Chirag

paolo.pizzol · January 22, 2016, 12:06

Thanks Chirag! I'll try the solvers and see how it goes :-)

January 22, 2016, 09:53	gas nozzle in vacuum chamber	#1
paolo.pizzol New Member PaoloP Join Date: Jan 2016 Posts: 5 Rep Power: 10	Hi all! To start off, I'm very new to Openfoam. My problem: I am trying to simulate a gas (Argon) entering a vacuum chamber (pressure in the mbar range, 1 - 10 mbar) at a certain speed (or mass flow, whichever). I'm starting with simple geometries (pipe, nozzle on one side, outlet on the opposite side) but so far I've had no luck. Which solver should I use? Boundary conditions? Any help is of course appreciated! Thanks! Paolo

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January 22, 2016, 12:01		#2
chirag New Member chirag khalde Join Date: Sep 2011 Posts: 22 Rep Power: 15	Hi Paolo, I am also working with similar problem. I could simulate flow in vacuum chamber but I still have some problems. I have used rhoCentralFoam and pisoCentralFoam. My simulation used to diverge as numerically pressure used to go below 0 pa. So i limited it to 0.000001 pa in the solver. In both the cases, I have observed is that I get a strage velocity profile near the shock region. I performed a fluent simulation on same geometry but this problem is not observed. May be someone can help out. link for my thread with the files attached in it! http://www.cfd-online.com/Forums/ope...ntralfoam.html Thanks! Chirag

January 22, 2016, 12:06		#3
paolo.pizzol New Member PaoloP Join Date: Jan 2016 Posts: 5 Rep Power: 10	Thanks Chirag! I'll try the solvers and see how it goes :-)