Simple question about pressure outlet.

January 7, 2006, 10:10

Hi, all
I'm used to run CFX and new to Fluent. I'm running a test case to simulate a ball moving in free stream :<font color=blue>
A ball(dia=1m) inside a brick (20m x 20m x20m), with
--one face(Xmin) velcity-inlet speed=1 m/s
--opposite face(Xmax) pressure-outlet
then I don't know what the other faces BC should be ? (I've used pressure-outlet/Outlet Vent, but it will always show that reversed flow on these 4 sides and the residule converged curve is not good)</font>

Thanks in advance. K.

January 7, 2006, 10:56

what is ur viscous model,ur problem seems to be a transition case, reversed flow is not an error.

January 7, 2006, 19:50

Thanks for response! What I'm really cared about is the reversed flow warning. Is there a boundary type suitable for openings which allow both IN & OUT in Fluent ?

January 8, 2006, 05:28

"Is there a boundary type suitable for openings which allow both IN & OUT in Fluent ?"

What exactly u want, when u r not sure about your outlet condition, use outflow boundary type in fluent

January 7, 2006, 10:10	Simple question about pressure outlet.	#1
Kiddo Guest Posts: n/a	Hi, all I'm used to run CFX and new to Fluent. I'm running a test case to simulate a ball moving in free stream :<font color=blue> A ball(dia=1m) inside a brick (20m x 20m x20m), with --one face(Xmin) velcity-inlet speed=1 m/s --opposite face(Xmax) pressure-outlet then I don't know what the other faces BC should be ? (I've used pressure-outlet/Outlet Vent, but it will always show that reversed flow on these 4 sides and the residule converged curve is not good)</font> Thanks in advance. K.

January 7, 2006, 10:56	Re: Simple question about pressure outlet.	#2
sharuk Guest Posts: n/a	what is ur viscous model,ur problem seems to be a transition case, reversed flow is not an error.

January 7, 2006, 19:50	Re: Simple question about pressure outlet.	#3
Kiddo Guest Posts: n/a	Thanks for response! What I'm really cared about is the reversed flow warning. Is there a boundary type suitable for openings which allow both IN & OUT in Fluent ?

January 8, 2006, 05:28	Re: Simple question about pressure outlet.	#4
sharuk Guest Posts: n/a	"Is there a boundary type suitable for openings which allow both IN & OUT in Fluent ?" What exactly u want, when u r not sure about your outlet condition, use outflow boundary type in fluent

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