[fsyhl]

Dear all

Now I am learning how to mesh tetra mesh in ICEM.Generally, we use Octree mesh first, delete the volume mesh and then create the Delauney mesh from the remaining (surface) elements after smoothening.

But when I see ICEM's help about smoothing mesh,the note mentioned that smoothing mesh "It is no longer necessary to load a geometry file in order to perform mesh smoothing".So if this sentence means that smoothing mesh is not based on geometric surfaces or I understand it wrongly?



The reason I concern this is that I need to run a fluid-solid thermal coupling simulation and the soild's deformation is my most concern, but the deformation will only be serval microns（may only one to two). So I worry if mesh don't fit the geometry I cannot get accurate results.

So my final questions are:
1.Smoothing mesh is not based on geometric surfaces or I understand it wrongly?
2.Surface mesh meshed by Octree is less fitter that other shell mesh methods or not?
3.The degree that the mesh fit the geom is only determined by mesh methods or we can edit it use ICEM? Whether there are parameters to measure this degree.
4.My worry is necessary or not?

This is my first questions on this forums, very happy to join this community!

Looking forward to answers, thank you!

[Gert-Jan]

1. Smoothing mesh means smoothing mesh, not smoothing geometry.
After Octree meshing, the nodes of the elements are projected on Geometrical Points, Lines and Surfaces. When smoothing the mesh, the nodes might slide over lines and surfaces.
2. ICEM is useful for Bad CAD (with gaps, holes, etc). If you have a good geometry, better use the ANSYS Mesher. This first meshes the surfaces and then the volumes. THe representation of the geometry is generally much better.
3. Using Edit Mesh, you can move the nodes, either manually or automatically. In this way, you can improve the mesh, but it is laborious, and error prone, so be sure to make a lot of backups.
4. That depends. If the flow channel is 10 micron, the 1 or 2 micron seems important. If the channel is 1 meter, I would not worry.

[fsyhl]

Originally Posted by Gert-Jan

1. Smoothing mesh means smoothing mesh, not smoothing geometry.
After Octree meshing, the nodes of the elements are projected on Geometrical Points, Lines and Surfaces. When smoothing the mesh, the nodes might slide over lines and surfaces.
2. ICEM is useful for Bad CAD (with gaps, holes, etc). If you have a good geometry, better use the ANSYS Mesher. This first meshes the surfaces and then the volumes. THe representation of the geometry is generally much better.
3. Using Edit Mesh, you can move the nodes, either manually or automatically. In this way, you can improve the mesh, but it is laborious, and error prone, so be sure to make a lot of backups.
4. That depends. If the flow channel is 10 micron, the 1 or 2 micron seems important. If the channel is 1 meter, I would not worry.

Thank you for your answer!