Fluid Particles Penetrating Piston?
I am doing a 3D simulation, where I am generating 3D waves using a moving piston with regular 2nd order waves, but experiencing that fluid particles for some reason can enter the piston:
Orange is piston, blue is fluid and black is "beach"/floor. Side and top view. Has anyone experienced this before or is there an error when doing it in 3D? I have the simulation in 2D without a problem.