i want to compute pressure drop in a channel with obstacles. as i know, in palabos we can not define out flow B.C like CFD software (Fluent,OpenFoam,…)

I want to compute velocity (pressure) at out let, only mass balance is considered in the simulation.

can i use Zou/He BC (createZouHeBoundaryConditionXD) for this?

While I haven’t touched LB for a number of months, I think I know how to help you.

So long as you define the inflow condition and leave the outflow boundary as periodic the pressure drop will establish itself and come to a steady state.

I am simulating flow in a chamber. i am using Guo’s non-equilibrium extrapolation scheme. I know inlet velocity and at outlet pressure is 1 atm.my Re=200.I have written my inlet BC as
rho[NY-1][i] = rho[NY-2][i];
u_x[NY-1][i] = 0.0;
u_y[NY-1][i] = U = 0.05;
and out flow BC as follows.
rho[NY-1][i] = rho[NY-2][i];
u_x[NY-1][i] = u_x[NY-2][i];
u_y[NY-1][i] = u_y[NY-2][i];
My density is decreasing for every iteration. what went wrong with my code?. i have doubt regarding implementation of BC.
Please help.