Fluid Entering My Floating Structure

[AvatarS02]

I have a floating‐structure model with a face‐type fill mode that I use on a piston wave-maker model. But during the simulation, water enters the cavity of my structure as shown in the image.

What might be causing this? Thank you.

[imestevez]

There are not enough boundary particles to resolve the dynamic boundary conditions or the fluid-structure interaction. Please follow the examples in the DualSPHysics package to see how to set up your case