def METHOD_NAME(self, velocity):
    """Place boundaries *not* exactly on a LB node."""
    wall_shape1 = espressomd.shapes.Wall(
        normal=[1, 0, 0], dist=AGRID)
    wall_shape2 = espressomd.shapes.Wall(
        normal=[-1, 0, 0], dist=-(BOX_L - AGRID))
    self.lbf.add_boundary_from_shape(wall_shape1)
    self.lbf.add_boundary_from_shape(wall_shape2, velocity)