dynamicMotionSolverFvMeshAMI with 6DoF motion

benchwell · March 4, 2022, 07:28

Dear Foamers,

in the past, I have successfully set up the sixDoFRigidBodyMotion solver with AMI patches to separate a rotating cell region from a static surrounding.

Now I wanted to make use of the improved numerics implemented in dynamicMotionSolverFvMeshAMI. Now when I use sixDoFRigidBodyMotion as motionSolver, nothing happens.

I traced this to this particular change:

dynamicMotionSolverFvMesh.C

Code:

fvMesh::movePoints(motionPtr_->newPoints());

dynamicMotionSolverFvMeshAMI.C

Code:

pointField newPoints(motionPtr_->curPoints());

if(changeRequired
{
    [...]
    polyTopo.movePoints(newPoints); 
}
else
{
    fvMesh::movePoints(newPoints);
}

Why would the field be called newPoints if it uses the current points? Is this meant to be that way or faulty? When I change the call to

dynamicMotionSolverFvMeshAMI.C

Code:

pointField newPoints(motionPtr_->newPoints());

It does use the sixDoFRigidBodyMotion as intended.

Maybe someone can elaborate on the improved numerics, too, as I don't really understand, what's happening there.

Kind regards,
Felix

quarkz · August 18, 2023, 04:23

Hi benchwell,

Did you manage to find your ans? I wonder if the reason the sixDOF did not work is because the new AMI with topological changes is not absorbed into the standard dynamicMotionSolverFvMesh model?

Btw, you mentioned that you change the dynamicMotionSolverFvMeshAMI.C.

So did you create a new dynamicMotionSolverFvMeshAMI model and re-compile it?

And the sixDOF worked w/o any problem after that?

Thanks.

March 4, 2022, 07:28	dynamicMotionSolverFvMeshAMI with 6DoF motion	#1
benchwell New Member Felix Weiler Join Date: Nov 2016 Location: Bremen Posts: 22 Rep Power: 9	Dear Foamers, in the past, I have successfully set up the sixDoFRigidBodyMotion solver with AMI patches to separate a rotating cell region from a static surrounding. Now I wanted to make use of the improved numerics implemented in dynamicMotionSolverFvMeshAMI. Now when I use sixDoFRigidBodyMotion as motionSolver, nothing happens. I traced this to this particular change: dynamicMotionSolverFvMesh.C Code: fvMesh::movePoints(motionPtr_->newPoints()); dynamicMotionSolverFvMeshAMI.C Code: pointField newPoints(motionPtr_->curPoints()); if(changeRequired { [...] polyTopo.movePoints(newPoints); } else { fvMesh::movePoints(newPoints); } Why would the field be called newPoints if it uses the current points? Is this meant to be that way or faulty? When I change the call to dynamicMotionSolverFvMeshAMI.C Code: pointField newPoints(motionPtr_->newPoints()); It does use the sixDoFRigidBodyMotion as intended. Maybe someone can elaborate on the improved numerics, too, as I don't really understand, what's happening there. Kind regards, Felix Last edited by benchwell; March 4, 2022 at 07:29. Reason: Added file names for clarity

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August 18, 2023, 04:23		#2
quarkz Senior Member TWB Join Date: Mar 2009 Posts: 414 Rep Power: 19	Hi benchwell, Did you manage to find your ans? I wonder if the reason the sixDOF did not work is because the new AMI with topological changes is not absorbed into the standard dynamicMotionSolverFvMesh model? Btw, you mentioned that you change the dynamicMotionSolverFvMeshAMI.C. So did you create a new dynamicMotionSolverFvMeshAMI model and re-compile it? And the sixDOF worked w/o any problem after that? Thanks.