Hello,

I am new to LAMMPS, but is it possible to create a boundary condition that is like a Couette flow, with a horizontal velocity Vx, but also includes a vertical velocity, which is defined as Vy = (P-Pwall)L/c, where P is the applied pressure in the -ve y direction, Pwall is the pressure of the particles on the wall in the +ve y direction, L is the length of the wall in x direction and c is a damping coefficient? (The attached diagram hopefully describes it better).

In steady state, the vertical velocity should be zero, as the pressures should balance. I ask this because I am trying to test the method in this paper:

https://journals.aps.org/pre/abstract/10.1103/PhysRevE.72.021309

Kind regards,

Andrew