[Vivio]

Hi everyone,

I'm trying to run some overset water entry/slamming cases with overInterDyMFoam and using a simple wedge drop case for validation and testing, using the case files here: as a base.

The background grid is Cartesian and there is a moving foreground mesh with a wedge. The initial mesh setup is shown in the first attached image.



however, after some time, the surface of the wedge starts to deform and it develops a "crinkled" surface. The stage of the simulation where this occurs changes depending on the initial conditions but it appears to happen as the body passes through a horizontal plane in the domain. The surface ends up as shown in the second image.



Obviously this impacts the accuracy of the simulation and destroys any useful results, as the suface of the wedge is not smooth.

Any ideas on what might cause this? The pointDisplacement patch for the wedge surface is defined as

floatingObject
    {
        type            calculated;
        value           uniform (0 0 0);
    }

and the dynamic mesh solver is sixDoFRigidBodyMotion using this patch as the moving body. Other than that I'm not sure how this error can creep in.

Best regards,
Vivio