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Old   June 30, 2014, 20:10
Question Split Mass Flow Rate in ANSYS CFX
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Ashkan Javadzadegan
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Dear all,
I am modelling blood flow in a bifurcated artery. I know the total inlet mass flow rate and fraction of the flow leaving each outlet. For example inlet mass flow is 0.9 gr/s and 20% of this flow passes through the outlet 1 and 80% leaves through the outlet 2.
For boundary condition, I used mass flow rate at inlet and both outlets; however, while solving the following notice is given for both outlets:

A wall has been placed at portion(s) of an OUTLET |
| boundary condition (at 100% of the faces, 100% of the area) |
| to prevent fluid from flowing into the domain. |
| The boundary condition name is: Outlet 1.

I know in this case I should use opening boundary condition, but the only known parameter at the outlets is mass flow rate fraction.
Please can anyone let me know how I should specify the boundary condition for my problem.

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Old   July 2, 2014, 22:23
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First off, I would try a pressure boundary condition at your inlet. If you are gettng recirculation, extend your outlets further downstream.
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Old   July 9, 2014, 03:08
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You can try opening with reference pressure - if you know pressure on the BCs
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