when i find below iteration:

"reversed flow in 1 face on pressure-outlet 9"

what does it mean?

i cannot find answer on fluent documentation

there is some people discuss this question widely in the site refer to their answers.

It means that the pressure calculated at a cell inside the domain has a static pressure below that defined at the boundary so that flow is trying to come into the domain at the outlet resulting in reverse or back flow. Check all bc's, move outlet boundary further away and check grid. This may not be unreasonable for the boundary conditions you have applied. The boundary conditions themselves may be unreasonable.

however i find this "error" in the grid indipendence analysis of my problem. In other words i find this problem only for particular grid dimensions...what do you think about this phenomenon??

Hi there...

I am not sure but may this link help you somehow...! I am also dealing with "reversed flow" cases...! May be..we will be helpful to each other...if possible ..keep in touch...!

---sushii.

http://www.cfd-online.com/Forum/fluent.cgi?read=53320