grid 8 8 1
cell_dimensions 1 1 1

flow incompressible
xy_boundary free_slip
yz_boundary free_slip
zx_boundary free_slip
viscosity 0.1
gravity 0

initial_particles everywhere random
density 64

initial_velocity zero

u 3 3 0 50
u 3 4 0 -50
v 3 3 0 -50
v 4 3 0 50

