sim.applyForceToWall

Hi Romain,

LsmMpi.applyForceToWall(..) requires the particle-wall interaction group name to be passed as the first argument, rather than the wall name.

For example, suppose you have created a wall called "bottom_wall" this way:

sim.createWall(
  name = "bottom_wall",
  posn = Vec3 (0,0,0),
  normal = Vec3 (0,1,0)
)

then specified an NRotElasticWallPrms interaction group acting between particles and the wall in the following way:

sim.createInteractionGroup (
   NRotElasticWallPrms (
      name = "bottom_wall_IG",
      wallName = "bottom_wall",
      normalK = 10000.0
   )
)

To apply a prescribed force (e.g. Fplate) to this wall, use the following:

sim.applyForceToWall ("bottom_wall_IG", Fplate)

Note that "bottom_wall_IG" is passed as an argument, rather than "bottom_wall".

Cheers,

Dion

P.S. Please note that it is important that the net force acting on a wall is non-zero initially when using applyForceToWall(..). It is usually best to move the walls initially using moveWallBy(..) until the net wall force is non-zero, before commencing to use applyForceToWall(..). In any case, applyForceToWall(..) must always be supplied an interaction group name, rather than a wall name.