Connecting Boundaries

dani2702 · November 14, 2016, 12:10

Hi,

I'm working with a multiphase flow and I encountered a problem.

Let's say a flow from Inlet A flows through a tunnel and exists at Outlet B. Now there is a pipe (C) connected at the top middle of the tunnel with a flow into the tunnel. The flow of C should be the same as at the outlet B. So B and C are kind of like connected.

So my question is, is there a boundary condition for C to connect the velocity (and other parameters like alpha for multiphase flow) to the Inlet-Boundary B?

Thanks for your help!

Saideep · November 14, 2016, 13:57

Hi, it would have been better if you attached a picture of your domain.

From my understanding, I dont see why would you need a boundary at the intersection of B and C. There would be only one outlet and that would be for C pipe.

dani2702 · November 14, 2016, 16:07

So here is a picture of it. Hope this will clear things up!

philippose · November 14, 2016, 17:52

Hi,
A Good Day to you.

In my opinion, this would be a good case to use the groovyBC boundary condition which comes as part of the swak4Foam library.

You can force the inlet flow at C to be equal to the outlet flow at B.

Search for groovyBC coupling on the forum and on Google.

Regards,
Philippose

November 14, 2016, 12:10	Connecting Boundaries	#1
dani2702 New Member Join Date: Sep 2016 Posts: 3 Rep Power: 10	Hi, I'm working with a multiphase flow and I encountered a problem. Let's say a flow from Inlet A flows through a tunnel and exists at Outlet B. Now there is a pipe (C) connected at the top middle of the tunnel with a flow into the tunnel. The flow of C should be the same as at the outlet B. So B and C are kind of like connected. So my question is, is there a boundary condition for C to connect the velocity (and other parameters like alpha for multiphase flow) to the Inlet-Boundary B? Thanks for your help! Last edited by dani2702; November 14, 2016 at 16:08.

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November 14, 2016, 13:57		#2
Saideep Senior Member Saideep Join Date: Apr 2015 Location: INDIA Posts: 203 Rep Power: 12	Hi, it would have been better if you attached a picture of your domain. From my understanding, I dont see why would you need a boundary at the intersection of B and C. There would be only one outlet and that would be for C pipe.

November 14, 2016, 17:52		#4
philippose Senior Member Philippose Rajan Join Date: Mar 2009 Location: Germany Posts: 552 Rep Power: 25	Hi, A Good Day to you. In my opinion, this would be a good case to use the groovyBC boundary condition which comes as part of the swak4Foam library. You can force the inlet flow at C to be equal to the outlet flow at B. Search for groovyBC coupling on the forum and on Google. Regards, Philippose