[windhair]

Hello, all

I want to model a simple flow inside pipe, what I want to specify is the pressure at inlet. But there are some problem I do not really understand.

The pressure is 3 atm
When I set ref.pressure to 1 atm, and relative static pressure to 2 atm, I can get the results, but when I modify the reference pressure to 3 atm, and relative statc pressure to 0 atm, the solve stops in the first iteration, and no result is generated, why?

Thanks all