Nudging strength for passive and active conditions

[feroda]

Just a basic question:
It is recommended to put a stronger nudging on active condition than that on passive.
What's the reason for that?

In condition which the inflow and outflow are equally strong across the open boundary, is the above "law"
still true?

Thanks

! Factor between passive (outflow) and active (inflow) open boundary
conditions. If OBCFAC > 1, nudging on inflow is stronger
than on outflow (recommended).
OBCFAC == 0.0d0 ! nondimensional

[kate]

Yes, it's still true. The idea is that on outflow, the model knows what is flowing out because it came from inside the model domain. On inflow, you are bringing water from outside which the model doesn't know anything about without having the nudging to the boundary value.