Combining/connecting two different meshes ?

Mesh1

Hello Community, 

I have two separate meshes generated from two different geometries.  Geometry 1 is original design, Geometry 2 is slightly modified.  I imported geometry 2 and re-meshed the re-designed section.  How to stitch the two meshes together  along the edge  (green / brown)  ?

 

Thank you. 

Mesh 1 

 

Adriano A. Koga

if it is not a problem to you, you could use a tied/freeze/glue contact to couple these parts, independent on your node connection. It would be easier than reconnecting node-to-node. There might be some discontinuities and peak stresses, but it dependes on your interest.

If you really need to reconnect node to node, then you will need to delete your mesh, and make sure your initial geometry has shared surfaces to guaranteee a proper connection when the mesh is generated.

Mesh1

Thank you Adriano. Very helpful. 

 Here is my process the old mesh created with original geometry. When geometry changed, I imported new geometry and then deleted old mesh in re-designed area. Next I re-meshed. 

Can you tell me what is meant by geometry has shared surfaces ?  Does this  mean that on the geometry I can select  any surfaces , or do I need to do something different ? 

Adriano A. Koga

Mesh1 said:

Thank you Adriano. Very helpful. 

 Here is my process the old mesh created with original geometry. When geometry changed, I imported new geometry and then deleted old mesh in re-designed area. Next I re-meshed. 

Can you tell me what is meant by geometry has shared surfaces ?  Does this  mean that on the geometry I can select  any surfaces , or do I need to do something different ? 

as an example, if you have a solid in HW and you use the cut/trim operation in this solid, it will break the solid in 2 pieces but keeping a shared surface between them, meaning that they are now 2 different solids, but connected through this shared common surface.

When you generate your mesh, shell or solid, this common surface will have also common nodes.

This is covered in a couple tutorials for generating hex-mesh, for example, in the HM tutorials.

 

so, in order to get a 100% connected mesh, you would need to have these new solids to be connected to the former ones, by having shared surfaces.

 

If you don't want to have trouble creating these, a workaround, fairly used, is to force them to be connected by using TIE/FREEZE/GLUED contact, depending on your solver.

Mesh1

Hi Adriano, 

I am not sure if this would be a contact. Here is my awful art work to illustrate what I am trying to do conceptually.  Would the two meshes be contact ? 

Adriano A. Koga

Mesh1 said:

Hi Adriano, 

I am not sure if this would be a contact. Here is my awful art work to illustrate what I am trying to do conceptually.  Would the two meshes be contact ? 

if you're not that interest in the interface of the red and green part, i would go for contacts. Now if you are really interested in this particular region, make sure you remesh your model, and be sure that your geometries are connected, or create first a shell mesh, connecting your new part, and later on, generate your tetra mesh.

SimLab could do this easily too, if you are familiar with it.