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Surface-to-Surface Contact VS Mesh Mating Condition - Free Coincident

Gears Valued Contributor Gears Valued Contributor
Gears Valued Contributor

Hello,

 

I am reffering to this Thread.

 

I read the replies concerning the "gluing", but what is the difference between

 

Surface-to-Surface Contact VS Mesh Mating - Free Coincident?

 

Kind regards

12 REPLIES 12

Re: Surface-to-Surface Contact VS Mesh Mating - Free Coincident

Gears Phenom Gears Phenom
Gears Phenom

Check this thread:

https://community.plm.automation.siemens.com/t5/CAE-Simulation-Simcenter-3D-Forum/MMC-and-glue/m-p/5...

Contact can not transfer tenlile loads, only compression. If you use Mesh Mating then two parts of mesh will be bounded together, as glue.

Re: Surface-to-Surface Contact VS Mesh Mating - Free Coincident

Gears Valued Contributor Gears Valued Contributor
Gears Valued Contributor

Thanks for the reply.

 

I am not sure if the linked thread really answers my question, especially because my opening post was already referring to a similar thread regarding gluing which I am not interested in.

 

I am not asking the difference between:

 

Surface-to-Surface Gluing VS Mesh Mating Condition - Glue-Coincident

 

BUT

 

Surface-to-Surface Contact VS Mesh Mating Condition - Free Coincident.

 

Could you explain me the difference here?

Re: Surface-to-Surface Contact VS Mesh Mating - Free Coincident

Gears Phenom Gears Phenom
Gears Phenom

Well, I little bit confuze you. If you use Mesh Mating - Free Coincident then two parts of mesh will have coincident nodes and actualy mesh vill not have conection and can pass through each other. You have to establish contact after mesh mating.

Re: Surface-to-Surface Contact VS Mesh Mating Condition - Free Coincident

Gears Valued Contributor Gears Valued Contributor
Gears Valued Contributor

What is " Mesh Mating Condition - Free Coincident" then good for?

Re: Surface-to-Surface Contact VS Mesh Mating Condition - Free Coincident

Gears Phenom Gears Phenom
Gears Phenom

Create neat conformal mesh for:

- increasing of contact precision especially in press-fit problems;

- creating gaps, springs or other node to node joints;

- using in acoustic problems where air/fluid and steel meshes must be separate;

- translating mesh to third party solver (CFD, heat transfer or electromagnetics) where conformal mesh is required;

- etc...

Re: Surface-to-Surface Contact VS Mesh Mating Condition - Free Coincident

Siemens Phenom Siemens Phenom
Siemens Phenom

Karachun thanks for summing up well the usefulness of mesh mating free coincident.

 

Regards,

Mark

Re: Surface-to-Surface Contact VS Mesh Mating Condition - Free Coincident

Gears Phenom Gears Phenom
Gears Phenom

But actually Nastran/TMG Flow solvers can handle press-fit contact, acoustics and interfaces in CFD with nonconformal mesh with good accuracy.

All depends on level of perfectionism of user.

Re: Surface-to-Surface Contact VS Mesh Mating Condition - Free Coincident

Gears Valued Contributor Gears Valued Contributor
Gears Valued Contributor

Thanks for the replies!

 

How is " Mesh Mating Condition - Free Coincident" good in "increasing of contact precision"?

Re: Surface-to-Surface Contact VS Mesh Mating Condition - Free Coincident

Siemens Phenom Siemens Phenom
Siemens Phenom

Curved surfaces with mismatched meshes will have source and target element faces that intersect each other due to mesh discretization. This leads to initial penetrations and gaps in the contact region. These can be minimized by contact options like node adjustment, initial penetration offsets, etc. but the best scenario is to have matching meshes in the first place.