pressure boundary condition

hamid1 · May 21, 2012, 06:19

Hi All

Is it possible to set all the boundary conditions, "pressure outlet"?
this is to create a vacuum in a pipe with a stationary fluid inside ..

ravi_cfd · May 21, 2012, 07:11

hi,
without an inlet ..its not possible to define an outlet.

so not possible to define all the boundaries as outlets.

hamid1 · May 21, 2012, 08:37

thanks for reply,
the idea is to apply an aspiration in a domain which is initially still (no fluid movement before applying the aspiration force), and after applying the aspiration force the fluid should move from inlets to the aspiration boundary (aspiration boundary = minus static pressure or minus pressure outlet)
do you think i have to impose inlet pressure at inlets,

p.s. i imposed pressure outlet on every boundary, it actually works but the results is not correct to me ..

May 21, 2012, 06:19	pressure boundary condition	#1
hamid1 Senior Member hamid Join Date: Nov 2010 Posts: 185 Rep Power: 15	Hi All Is it possible to set all the boundary conditions, "pressure outlet"? this is to create a vacuum in a pipe with a stationary fluid inside ..

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May 21, 2012, 07:11		#2
ravi_cfd New Member kumar ravi Join Date: May 2012 Posts: 4 Rep Power: 13	hi, without an inlet ..its not possible to define an outlet. so not possible to define all the boundaries as outlets.

May 21, 2012, 08:37		#3
hamid1 Senior Member hamid Join Date: Nov 2010 Posts: 185 Rep Power: 15	thanks for reply, the idea is to apply an aspiration in a domain which is initially still (no fluid movement before applying the aspiration force), and after applying the aspiration force the fluid should move from inlets to the aspiration boundary (aspiration boundary = minus static pressure or minus pressure outlet) do you think i have to impose inlet pressure at inlets, p.s. i imposed pressure outlet on every boundary, it actually works but the results is not correct to me ..