Boundary condition clarification
 

Dear friends

I have some questions.

I am doing transient coronary flow analysis.I set stress free boundary condition.
During the analysis, I see the following statement. after some time did n't see the warning.

A wall has been placed at portion(s) of an OUTLET |
| boundary condition (at 2.3% of the faces, 3.4% of the area) |
| to prevent fluid from flowing into the domain. |
| The boundary condition name is: out. |
| The fluid name is: Fluid 1. |
| If this situation persists, consider switching |
| to an Opening type boundary condition instead.

My questions are
Is there any back flow in the coronary artery in a human blood circulatory system?

if you people are saying yes, shall I set opening type boundary condition at the outlet ?

what is the best outlet condition in the coronary flow analysis?

Please refer the following attachment.Is it convergent solution?

Thank you for your valuable advice
Reagrds
Govind

Please help me .is the solution converged solution or not?
I have given here user points and mass momentum

Thank you

Regards
Govind