[ashtonJ]

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.

Thanks
AshtonJ

[evcelica]

First off, I would try a pressure boundary condition at your inlet. If you are gettng recirculation, extend your outlets further downstream.

[Martin_Sz]

You can try opening with reference pressure - if you know pressure on the BCs