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Taras

Surface mesh and nodes association

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Hi there!

Would someone please explain me one thing?

I have a complex solid model. I split it on parts. Each of parts have own plane of symmetry. So I split each one to mesh just half (quarter).

Then after surface mesh of half (quarter) I reflect 2d mesh to opposite part and associate nodes to it. After I try to mesh faces of the connected parts. But time to time mesher not "feels" associated nodes. Often it not "feels" associated nodes for edges with T-connections (works for only 2 surfaces of 3).

It makes me crazy...

 

Thnx in advance for answer.

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Thanks Rahul.

All solids are connected well by Boolean operations and have "yellow" surfaces inside. All T-connection edges are "yellow" too.

Trouble with mesh looks like that:

 

 

nodes_assotiation.png

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Hi,

Whenever you use Reflect option for reflecting element then element will not be connected at that junction and for solid components it will give T connection.

Always use these option for equivalencing node .( Free edges for 2D or Faces for 3D )

 

Regards

Rahul R

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After mesh reflection I associate new nodes with solid. And it seems to be OK.

But what's problem with original one? Look picture.

I make reflect for 2 3d meshes. For smaller one all right but for another one mesh connection fails.

What a difference?

 

nodes_assotiation2.png

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Mesh connectivity don't happens automatically in the case of reflect command. Such regions you can attain mesh connectivity using Automesh with remesh option for 2d elements.If possible share your model file with below ftp link.

https://ftam1.altair.com/filedrop/rahul.rajan@altair.com

 

Regards

Rahul R

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Can someone give recommendations for match meshing of T-connected surfaces?

I wanna mesh parted solid:

- solid parts connected by Boolean (common surf is yellow);

- 1st part 3d meshed

- faces extracted to the common surf

- nodes associated to the common surf

- when I try to mesh surf of the 2nd body mesh not feels nodes on the edge of the common surf

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Rahul, thanks a lot for your answers.

Obviously I'm doing something wrong.

I have sent you example model.

I hope you'll explain what I'm doing wrong.

Thank you again.

mesh_fail2.png

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So I have found some solution of the problem.

 

If we want got matched meshes of two bodies if one of them with boundary layers we have to:

 

- merge the bodies (no common surfs: no yellow surf or edges, only green one)

- extract  faces from the 1st body

- copy elements from meshed surf to the surf of the 2nd body

- associate nodes of copied elements to the surf

- mesh rest of the surfs of the 2nd body

- use copied elements as "fixed w/o BL" for CFD tetra.

 

Regards.

Hyperman likes this

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Hi @Taras,

 

I am stuck on the same kind of issue as you were. Could you explain to me some steps ? :

 - how do you merge two bodies ? I tried assemblies but it did not work out

 - how do you extract the surfaces of one body ? 

 - by copying the elements do you mean project or really copying ? 

 - how do you associate nodes to a surface ? 

 

Thanks in advance,

Alice

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