When running a simulation ( described in my previous posts) with better mesh (366000 nodes) I was recieving message:

****** Notice ****** |

" A wall has been placed at portion(s) of an OUTLET boundary condition (at 17 % of the faces, 16 % of the area) to prevent fluid from flowing into the domain. The boundary condition name is: Outlet. The fluid name is: Air Ideal Gas. If this situation persists, consider switching to an Opening type boundary condition instead."

This message appeared several times again with less persentage numbers.

Can someone explane what does it mean and how important is that for good results.

Thank you

Ted

Hi Ted,

It means just what it says. An outlet can only have flow out of the domain, but the simulation is preducting flow into the domain in a small region of the outlet. This sometimes happens early in a simulation before convergence is reached, and sorts itself out in the final converged solution.

Alternatively, if this is the final converged solution which is giving this message, it (most likely) means your exit boundary condition is too close to the "action". Need to move your exit boundary further downstream, or alternative use an opening boundary rather than an outlet.

Regards, Glenn

Thank you Glen. Ted