Inlet but not outlet

mireis · June 10, 2010, 04:41

Hi!

I'm starting with FLUENT. I have a simple model: an enclosure with an inlet and an outlet. I use compressible Xenon as fluid and I would like to find the pressure at the outlet giving some conditions at the inlet. As if I impose in Gambit that the outlet is 'pressure_outlet' FLUENT obliges me to specify a pressure there and as I work with compressible fluids I cannot use the 'outflow' boundary condition... Should I impose that my outlet is an 'interface'? Or... is there any way in FLUENT to modelize this kind of problems entering only the conditions at the inlet? I don't want to impose any condition at the outlet.

Thanks

jans · June 10, 2010, 10:56

Isn't the "pressure drop" the important quantity (especially if your flow is incompressible or almost so)? In that case you can have a velocity inlet and a pressure outlet, and set the pr at the pr outlet to zero (just a reference pr), and after simlulation note the pr at the vel inlet.

Hope that helps

June 10, 2010, 04:41	Inlet but not outlet	#1
mireis New Member Mireia Misisuki Join Date: Apr 2010 Posts: 12 Rep Power: 5	Hi! I'm starting with FLUENT. I have a simple model: an enclosure with an inlet and an outlet. I use compressible Xenon as fluid and I would like to find the pressure at the outlet giving some conditions at the inlet. As if I impose in Gambit that the outlet is 'pressure_outlet' FLUENT obliges me to specify a pressure there and as I work with compressible fluids I cannot use the 'outflow' boundary condition... Should I impose that my outlet is an 'interface'? Or... is there any way in FLUENT to modelize this kind of problems entering only the conditions at the inlet? I don't want to impose any condition at the outlet. Thanks

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
steam flow in a pipe driven by a pressure gradient between inlet and outlet	SalvoCalvo	Main CFD Forum	0	March 11, 2010 06:52
VOF Outlet boundary condition in cfd - ace	JM	Main CFD Forum	0	December 15, 2006 08:07
inlet and outlet boundary condition of pump	Thammasak	CFX	0	February 9, 2004 13:02
Question about inlet and outlet BC	babyface	Main CFD Forum	1	January 15, 2003 09:17
what the result is negatif pressure at inlet	chong chee nan	FLUENT	0	December 29, 2001 05:13

June 10, 2010, 10:56		#2
jans New Member Anirban Jana Join Date: Apr 2010 Location: Pittsburgh, PA, USA Posts: 17 Rep Power: 5	Isn't the "pressure drop" the important quantity (especially if your flow is incompressible or almost so)? In that case you can have a velocity inlet and a pressure outlet, and set the pr at the pr outlet to zero (just a reference pr), and after simlulation note the pr at the vel inlet. Hope that helps