Mass Flow Splitting for OpenFoam Outflow Boundary Conditions?

nephina · December 11, 2017, 17:50

Hi all,

I am looking for a solution to a particular problem with multiple outflows, my project is blood vessels that split into multiple outflows. I have flow rates at inlets and outlets. If I directly apply these flowrates, the solution doesnt converge. I resolved this problem in ANSYS Fluent by using the outflow option for my outlet and assigning the outflow percentage from each outlet as is shown in this link:

http://www.afs.enea.it/project/neptunius/docs/fluent/html/ug/node247.htm (under boundary conditions

So, my question is: is there a boundary condition in openfoam5 that will let me split the mass flow? I have not had much luck finding it by going through the boundary condition source code.
Thanks for any help!

franzsch · September 10, 2019, 11:04

Hello nephina,

have you figured out if this is possible in OpenFOAM?

Carlo_P · September 10, 2019, 11:42

You can if you create different patches.
For each patch you can set the massFlow.

WARNING MassFlowRate in Inlet and Outlet is not so stable

December 11, 2017, 17:50	Mass Flow Splitting for OpenFoam Outflow Boundary Conditions?	#1
nephina New Member Alexa Join Date: Dec 2017 Posts: 1 Rep Power: 0	Hi all, I am looking for a solution to a particular problem with multiple outflows, my project is blood vessels that split into multiple outflows. I have flow rates at inlets and outlets. If I directly apply these flowrates, the solution doesnt converge. I resolved this problem in ANSYS Fluent by using the outflow option for my outlet and assigning the outflow percentage from each outlet as is shown in this link: http://www.afs.enea.it/project/neptunius/docs/fluent/html/ug/node247.htm (under boundary conditions So, my question is: is there a boundary condition in openfoam5 that will let me split the mass flow? I have not had much luck finding it by going through the boundary condition source code. Thanks for any help!

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September 10, 2019, 11:04		#2
franzsch New Member Anna Bauer Join Date: Mar 2018 Posts: 2 Rep Power: 0	Hello nephina, have you figured out if this is possible in OpenFOAM?

September 10, 2019, 11:42		#3
Carlo_P Senior Member Carlo_P Join Date: May 2019 Location: Italy Posts: 176 Rep Power: 8	You can if you create different patches. For each patch you can set the massFlow. WARNING MassFlowRate in Inlet and Outlet is not so stable