rhoCentralFoam

robdeb · December 5, 2012, 04:27

Hi everybody!

I'm trying to simulate a subsonic flow in a nozzle.
I've tried to do this with rhoCentralFoam but the simulation didn't give good results. I don't know if it comes from my BC's or if rhoCentralFoam can't deal with subsonic flow.

I've attached my 0 folder to show you my BC's.

Thank you for your help.

treima · December 5, 2012, 10:03

Hello,

what do you mean when you say "no good results"? Don´t they reach a steady state or anything else?

regards
treima

robdeb · December 5, 2012, 10:22

After one iteration, I've got a Mach number of 0.43 but I know after analytical calculations that my maximum Mach number has to be more or less 0.1 at steady state.

Thank you!

mturcios777 · December 5, 2012, 13:38

Your case looks like its adapted from a 2D case. If this is what you want, then the frontAndBack boundaries should be of tpe "empty" for all your variables; in some of them they are "empty", in some they are "zeroGradient".

treima · December 5, 2012, 14:18

For a Mach number about 0.1, is it really necessary to use a compressible solver?

robdeb · December 6, 2012, 05:46

Quote:

Originally Posted by treima

For a Mach number about 0.1, is it really necessary to use a compressible solver?

Yes, you're right. But what I would like to do is to test different solvers for different flows. I've already tested sonicFoam for a large range of Mach Number (subsonic to supersonic flows). It works good. And now I would like to test with rhoCentralFoam and compare the results.

robdeb · December 6, 2012, 05:49

Quote:

Originally Posted by mturcios777

Your case looks like its adapted from a 2D case. If this is what you want, then the frontAndBack boundaries should be of tpe "empty" for all your variables; in some of them they are "empty", in some they are "zeroGradient".

Yes, it's adapted from a 2D case. I'll test your boundaries and see what it gives.

Thank you for your advise.

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December 5, 2012, 10:03		#2
treima Member Join Date: Mar 2012 Location: Munich, Germany Posts: 67 Rep Power: 14	Hello, what do you mean when you say "no good results"? Don´t they reach a steady state or anything else? regards treima

December 5, 2012, 10:22		#3
robdeb New Member Robin Debroux Join Date: Oct 2012 Posts: 22 Rep Power: 14	After one iteration, I've got a Mach number of 0.43 but I know after analytical calculations that my maximum Mach number has to be more or less 0.1 at steady state. Thank you!

December 5, 2012, 13:38		#4
mturcios777 Senior Member Marco A. Turcios Join Date: Mar 2009 Location: Vancouver, BC, Canada Posts: 740 Rep Power: 28	Your case looks like its adapted from a 2D case. If this is what you want, then the frontAndBack boundaries should be of tpe "empty" for all your variables; in some of them they are "empty", in some they are "zeroGradient".

December 5, 2012, 14:18		#5
treima Member Join Date: Mar 2012 Location: Munich, Germany Posts: 67 Rep Power: 14	For a Mach number about 0.1, is it really necessary to use a compressible solver?