prescribed rotation restraint

The restraint currently

• does not use time step
• diverges if not underrelaxed

Ideas:

• under relax applied momentum
• do multiple iterations of motion system (nIter)

mentioned in commit fa7aeaf4709f8e96ec7cf5375d74a19148a31d32

Since I have just seen this I'd like to add something, although somewhat unrelated to the issue at hand. A prescribed rotation restraint is something like fixed moment to the 6DoF body. Hence I'd be delighted if a fixed moment and force would be added to the next release. Attached is a quick version of a constantForce restraint. This is e.g useful to add buoyancy effects in incompressible solvers to an object. E.g sedimentation of particles. constantForce.zip

Best regards

By Stephan on 2018-06-14T09:05:11 (imported from GitLab project)

## Reattaching the author to the issue ticket: @Goeke ##

in prescribedRotation (in develop-pre-release) you can see

• how to read a Function1 to get a table
• how to get hold of Time and use e.g. timeValue to index into the table.

mentioned in commit f014a4830cc5787976324f404b58922ab9a1d55f

Sure. Attached is the modified externalForce with Function1 functionality. As far as I can tell, prescribedRotation has only been added to rigidBodyDynamics and not sixDoFRigidBodyMotion. Since similar changes would be needed to get access to the time for the other library I have not included the force for that one. externalForce.zip

I have tested it with the develop-pre-release branch.

By Stephan on 2018-06-23T20:18:59 (imported from GitLab project)

assuming resolved.

please reopen the ticket if the issue persists.

closed