Periodic flow

February 26, 2008, 04:15

Hi, I have an unsteady flow. At the inlet , velcoity U=0.2+0.3*sin(100*t) At outlet : opening type

At some times my inlet would be outlet. How should I choose Boundary condition in this case?

Thanks, ---Selim

February 26, 2008, 06:00

Hi,

If you mean that sometimes the flow goes into the domain and sometimes it goes out - that is fine, an inlet with a prescribed velocity should work here.

Glenn Horrocks

February 26, 2008, 08:48

you can execute it by using inlet boundary, because the 'inlet boundary' does not only means that the fluid flow into the calculating region.

February 26, 2008, 04:15	Periodic flow	#1
selim Guest Posts: n/a	Hi, I have an unsteady flow. At the inlet , velcoity U=0.2+0.3sin(100t) At outlet : opening type At some times my inlet would be outlet. How should I choose Boundary condition in this case? Thanks, ---Selim

February 26, 2008, 06:00	Re: Periodic flow	#2
Glenn Horrocks Guest Posts: n/a	Hi, If you mean that sometimes the flow goes into the domain and sometimes it goes out - that is fine, an inlet with a prescribed velocity should work here. Glenn Horrocks

February 26, 2008, 08:48	Re: Periodic flow	#3
kirby Guest Posts: n/a	you can execute it by using inlet boundary, because the 'inlet boundary' does not only means that the fluid flow into the calculating region.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
mass flow in is not equal to mass flow out	saii	CFX	12	March 19, 2018 06:21
periodic compressible flow	vivian	Main CFD Forum	2	April 25, 2006 06:04
Periodic boundary condition & Unsteady flow	Somchai	FLUENT	2	March 28, 2006 09:51
specifying the flow direction in periodic boundary	joanna	FLUENT	2	February 27, 2006 22:09
Can 'shock waves' occur in viscous fluid flows?	diaw	Main CFD Forum	104	February 16, 2006 06:44