Non-Reflecting Boundary Conditions (NRBC)

Palabos General
#1

Hi there,

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.

Cheers,
Eric

#2

I have a colleague who developed a code for non-reflective boundaries in Palabos for his master thesis. He used the ABC (Absorbing Boundary COndition) by Kam, if I’m not mistaken. You can check his work on his github

https://github.com/josepedro/palabos_acoustic/tree/master/src/acoustics

#3

Dear fsantox,

That’s really helpful! Thank you very much!

Cheers,
Eric