Backflow issue

[Wang-Lancelot]

Hi Costa,

I am trying to use SNaC to simulate a high Re cylinder flow.
But when the dimensionless time gets to some value, there is a huge backflow happening from the outlet.
I notice that you have already developed a subroutine "outflow" in bound.f90.

Could you kindly provide some help on how to use it?
I read the paper "Bozonnet et al., JCP 2021". However, I am not so sure how to implement the subroutines "outflow" and "outflow_p", especially "outflow_p" in which how to set the parameter "alpha"?

Thank you.