I am running the showcases of cylinder in 2D flow with the velocity BC around inlet, up and down; and outflow (zero-gradient of all velocity components) BC at the outlet.
As all these boxes are bounce-back, namely, they will reflect the pressure wave all the time, which would bring unsteadiness and collapse the program at high Re.
So I am asking whether there is any method or function to apply non-reflecting boundary condition on the outlet?
Really hope to hear from you. Any information is appreciated.