interaction potential with shan-chen mode

Lattice Boltzmann Method LBM: Theory
#1

Dear friends:
we need to caculate the interaction fore as we use the shan-chen mode to simulate the single component multiphase flows. When x+e is outside the fluid domain,then how to determain the interaction potential ? I need your kind help and best regards

Yours

Gongyou Liang

#2

Der Gongyou,

If it’s out of domain you can keep the same interaction potential G but you need specify the densities at those points (it depends either it’s wall or periodic boundary condition). If it’s wall when you will control the contact angle by specifying densities, if it’s periodic BC - you don’t have any special situation.

Hopefully it will help,
Alex

#3

Der Alex:
Thanks for your help and I will have a try.
Best Regards
Gongyou Liang

#4

Der Alex?
If it is a velocity boundary, then how to calculate the interaction potential psi(x+e) ?

Best wishes

Gongyou Liang

#5

Hi Goingyou,

If it’s velocity boundary conditions then you can calculate density and plug it into psi(x+e). However, I don’t know how it would be physical from the perspective of moving contact angles.

Cheers,
Alex