faceAreaWeightAMI_3D_octree. Where is it?

be_inspired · February 28, 2024, 08:50

Hi all,

Looking how to resolve a problem where checkMesh states that AMI Weights are ok ( higher than 0.9) but the simulation fails saying that there is a face without target, I found this article from ESI.

https://www.esi-group.com/sites/defa...e_Abstract.pdf

"Based on these successful preliminary tests, the new implicit AMI framework has been integrated into the development branch aiming for release in v2112. Further tests with the full car model are currently being performed and will be presented at the conference".

I have tried to use it but it seems v2212 does not have this development and neither develop branch. Any idea?

Tobi · March 24, 2024, 03:38

CheckMesh is not reliable here. If you check the mesh after mesh generation, you check the AMI interface at this specific mesh position.

If you turn the mesh during time, the AMI interface and it's single faces will get new neighbour faces and we need to recalculate the weights each time step. Depending on your Center and rotation axis, it might happen that the rotation is not smooth and faces cannot find neighbours. The min Weight goes to zero and this is prohibited.

Therefore, one can use ACMI or the new feature called "low weight correction". Using the latter one, the weights can go to zero even with AMI.

One can test the rotation in prior using "moveDynamicMesh".

February 28, 2024, 08:50	faceAreaWeightAMI_3D_octree. Where is it?	#1
be_inspired Senior Member M. Montero Join Date: Mar 2009 Location: Madrid Posts: 153 Rep Power: 17	Hi all, Looking how to resolve a problem where checkMesh states that AMI Weights are ok ( higher than 0.9) but the simulation fails saying that there is a face without target, I found this article from ESI. https://www.esi-group.com/sites/defa...e_Abstract.pdf "Based on these successful preliminary tests, the new implicit AMI framework has been integrated into the development branch aiming for release in v2112. Further tests with the full car model are currently being performed and will be presented at the conference". I have tried to use it but it seems v2212 does not have this development and neither develop branch. Any idea?

March 24, 2024, 03:38		#2
Tobi Super Moderator Tobias Holzmann Join Date: Oct 2010 Location: Tussenhausen Posts: 2,708 Blog Entries: 6 Rep Power: 51	CheckMesh is not reliable here. If you check the mesh after mesh generation, you check the AMI interface at this specific mesh position. If you turn the mesh during time, the AMI interface and it's single faces will get new neighbour faces and we need to recalculate the weights each time step. Depending on your Center and rotation axis, it might happen that the rotation is not smooth and faces cannot find neighbours. The min Weight goes to zero and this is prohibited. Therefore, one can use ACMI or the new feature called "low weight correction". Using the latter one, the weights can go to zero even with AMI. One can test the rotation in prior using "moveDynamicMesh". __________________ Keep foaming, Tobias Holzmann