I have simulated a simple channel with LBM.
At the bottom of the channel, I applied the No-Slip B.C., i.e. bounce-back.
As far as I know, at this boundary, the velocity is zero. But the vectors show that it is NOT.
How do you explain this?
What do you mean with "bounce-back"? It does not sound like a no-slip boundary condition (which would set the velocity of the fluid to the velocity of the wall). So either your wall is moving or you are not applying your boundary condition (all components of the velocity vector to zero) correctly.
Is your code cell centered or vertex centered? If the velocities you are plotting correspond to those at the center of the first row of cells above the wall then they do not need to be zero, velocities are only zero at the wall (at the bottom boundary of those cells). Did you check if your velocity field is divergence-free?
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