What boundary condition should i use?

harshavardhanps3839 · December 10, 2020, 12:20

I am designing low speed open type sub sonic wind tunnel(Mach NO~0.1). I completed my geometry and meshing i got struck at what boundary conditions should i use? Currently I am using Patm(static pressure inlet= atmospheric gauge pressure i.e Patm=0 pa) and mass flow rate boundary condition as outlet. Along with pressure inlet I am giving 0.5% turbulent intensity and 1 cm turbulent length scale. Are these boundary conditions correct?
please help me your help is much appreciated.

duri · December 11, 2020, 07:44

In this case fan is driving the flow. Total pressure at inlet and static pressure at exit would be atmospheric. The fan model has to supply the total pressure jump. Mass flow is controlled by total pressure at exit.

December 10, 2020, 12:20	What boundary condition should i use?	#1
harshavardhanps3839 New Member harshavardhanps Join Date: Dec 2020 Posts: 13 Rep Power: 5	I am designing low speed open type sub sonic wind tunnel(Mach NO~0.1). I completed my geometry and meshing i got struck at what boundary conditions should i use? Currently I am using Patm(static pressure inlet= atmospheric gauge pressure i.e Patm=0 pa) and mass flow rate boundary condition as outlet. Along with pressure inlet I am giving 0.5% turbulent intensity and 1 cm turbulent length scale. Are these boundary conditions correct? please help me your help is much appreciated. Last edited by harshavardhanps3839; December 11, 2020 at 05:59.

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December 11, 2020, 07:44		#2
duri Senior Member duri Join Date: May 2010 Posts: 245 Rep Power: 17	In this case fan is driving the flow. Total pressure at inlet and static pressure at exit would be atmospheric. The fan model has to supply the total pressure jump. Mass flow is controlled by total pressure at exit.