[YatengQ]

Dear all,

I'm recently trying to deal with two ellipsoid bodys in pure shear flow. The single ellipsoid body is simulated successfully, but when dealing with multi body there are some problems.

The method I used is
dynamicMesh:dynamicOversetFvMesh;
applicationverPimpleDyMFoam;
solid body motion solver:sixDoFRigidBodyMotion;

According to Multiple Floating Objects with 6DoF in OF 2.3.0

I add following codes in dynamicMeshDict:
solvers
{
ellipsoid1
{
...
}
ellipsoid2
{
...
}
}
There exists two main problems:
1. the pointdisplacement file in the post-processing can only display the ellipsoid1's mesh motion, mesh motion is not included in Pointdisplacement file in time folder. The result I post out here.
2.the Courant number becomes very large from the second time step, which means the simulation is not converged

As Bruno in the Previous link said:"A possible solution for this would be to create a new class that is based on "sixDoFRigidBodyMotionSolver" and that can then handle more than one body."

I guess the problem is the solver itself, So I want to ask if it is possible to creat two dynamicMeshDict for two bodys, then I Initialize two objects from mesh class. The two objects reads the solver coffes in two dynamicMeshDict
files.

First I update the first object's motion , then I used the updated mesh to update another object's motion like this in overPimpleDyMFoam:
...
++runTime;

Info<< "Time = " << runTime.timeName() << nl << endl;

mesh1.update();

mesh2.update();

if (mesh.changing())
...

I'm not sure if it is possible to do that, if can if there is anything aviliable to use as a reference.
Kind Regards,
Q.

[YatengQ]

problem is done, it's not the solver's fault. I made a mistake.