strange behaviour when comparing SixDoFRigidBodyMotion, RigidBodyDynamics and Overset libraries.

Hi,

While working in new developments I have come up with an expected results when comparing the three main libraries for rigid body motions (SixDoFRigidBodyMotion, RigidBodyDynamics and Overset) with the tutorial provided in the oficial release.

Please, note that I assume that the RigidBodyDynamics gives the correct results, as it has been widely validated.

If I compare (for a sligthly modified version of the tutorial), the results using the SixDoFRigidBodyMotion library (in green), and the RigidBodyDynamics library (in red), I get the same results (as expected).

Then, If I compare (using the same case), the RigidBodyDynamics library (in green) against the Overset library (in red), I get this weird result in the YAW rotation.

If I vary the constraint in the displacement (along axis Z or along axis X), I get the same weird results in the YAW rotation.

Please, can you clarify me if it is working correctly the Overset library?

Regards, Gabi

Hi, could you please share the setup for us to reproduce the issues? Thanks.

Please, find here the numerical setup.

01-case.tar.xz

Gabi

@Sergio - can you take a look?

Hi Gabriel, In the attached case I can only see the interFoam case with sixDoF. Can you provide the test you carried out including post-processing steps to get the plot you attached here?. However I am not surprised that overset has some different results from the single mesh approach. Specially where the pressures needs to be perfectly balanced to maintain a force balance as it seems to be the case here. You might need to change the interpolation and/or the mesh resolution in the overlap region. Thanks Sergio

Dear @barjasg, any update for this ticket (based on @Sergio's question above)?

Thanks.