Supersonic expansion

aap · June 9, 2005, 06:52

Hi!
I would like to simulate a gas expansion from a capillar of 0.5 mm diametre and at 250 mbar pressure into a tank at lower pressure (approx. 5 mbar). The velocity of the gas at inlet (capillar) is something like 800m/s and the regime is not laminar (Reynold number at the inlet is very high).
Which solver should I use? Is there any similar model in the tutorials?
Thanks a lot
Amalia

aap · June 15, 2005, 06:18

Hi!
Does anyone have experience in modelling supra sonic expansions with Openfoam?
Thanks
Amalia

coastal593 · February 21, 2008, 15:36

Hi Amalia,

did you ever figure this out? I have a similar problem except i only know the pressure at a pinhole into a region of reduced pressure. Let me know. I have my mesh set up and checked, I am just struggling with the BCs in transmissive regions and at the pinhole.

nsp82 · February 22, 2008, 03:29

Use Sonicturb Foam with standard KE turbulence.

Enjoy.

June 9, 2005, 06:52	Hi! I would like to simulate	#1
aap New Member Amalia Apalategui Join Date: Mar 2009 Posts: 13 Rep Power: 17	Hi! I would like to simulate a gas expansion from a capillar of 0.5 mm diametre and at 250 mbar pressure into a tank at lower pressure (approx. 5 mbar). The velocity of the gas at inlet (capillar) is something like 800m/s and the regime is not laminar (Reynold number at the inlet is very high). Which solver should I use? Is there any similar model in the tutorials? Thanks a lot Amalia

June 15, 2005, 06:18	Hi! Does anyone have experien	#2
aap New Member Amalia Apalategui Join Date: Mar 2009 Posts: 13 Rep Power: 17	Hi! Does anyone have experience in modelling supra sonic expansions with Openfoam? Thanks Amalia

February 21, 2008, 15:36	Hi Amalia, did you ever fi	#3
coastal593 Member Anthony Costa Join Date: Mar 2009 Posts: 40 Rep Power: 17	Hi Amalia, did you ever figure this out? I have a similar problem except i only know the pressure at a pinhole into a region of reduced pressure. Let me know. I have my mesh set up and checked, I am just struggling with the BCs in transmissive regions and at the pinhole.

February 22, 2008, 03:29	Use Sonicturb Foam with standa	#4
nsp82 New Member N S Prasad Join Date: Mar 2009 Posts: 15 Rep Power: 17	Use Sonicturb Foam with standard KE turbulence. Enjoy.

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