[qrie]

Hi,

I am simulating flow through a pipe. In my code, as is usual - I have a factor(ratio of mass in/mass out) multiplying the exit velocity for global mass conservation.

At the inlet I have given a parabolic velocity profile and convective outflow bcs at the outlet. So now when the factor is calculated for the first time step, it becomes infinity(since mass out is zero at the exit boundary) and the whole thing blows up.

How to resolve this?

Thanks,
Qrie