how to set inlet and outlet BC for oscillatory flow around a circular cylinder

November · March 23, 2012, 00:59

Hi all,

I think this must be an easy question for you guys, somehow I got stuck for some time now as a green hand and am searching online for a solution but with no luck up till now...

So, the question is as in the title, could anyone share how you exactly specify the inlet and outlet boundary condition for 0/p and 0/u for an oscillatory flow around a cylinder??
Say for example I have an oscillatory flow with the velocity (ux,0,0), in which ux=U_m*sin(2*pi*f*t).

I have tried oscillatingFixedValue for u and zeroGradient for p at inlet, and zeroGradient for u and 0 for p at outlet but got 0 values at all timesteps...

Any help is appreciated.

charlliemarshalll · June 2, 2020, 06:20

Got the same problem. I used groovyBC for the oscillatory flow, but just can't get the pressure right

Flowkersma · June 2, 2020, 09:08

Hi,
Have a look at my tutorial case.

March 23, 2012, 00:59	how to set inlet and outlet BC for oscillatory flow around a circular cylinder	#1
November New Member Join Date: Mar 2012 Posts: 12 Rep Power: 14	Hi all, I think this must be an easy question for you guys, somehow I got stuck for some time now as a green hand and am searching online for a solution but with no luck up till now... So, the question is as in the title, could anyone share how you exactly specify the inlet and outlet boundary condition for 0/p and 0/u for an oscillatory flow around a cylinder?? Say for example I have an oscillatory flow with the velocity (ux,0,0), in which ux=U_msin(2pift). I have tried oscillatingFixedValue for u and zeroGradient for p at inlet, and zeroGradient for u and 0 for p at outlet but got 0 values at all timesteps... Any help is appreciated. charlliemarshalll likes this.

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June 2, 2020, 06:20		#2
charlliemarshalll New Member Charlie Marshall Join Date: Jan 2020 Posts: 17 Rep Power: 6	Got the same problem. I used groovyBC for the oscillatory flow, but just can't get the pressure right

June 2, 2020, 09:08		#3
Flowkersma Senior Member Mikko Join Date: Jul 2014 Location: The Hague, The Netherlands Posts: 243 Rep Power: 12	Hi, Have a look at my tutorial case.