[nettarone]

Hi everyone,
I'm trying to realize an heat exchanger composed of:
1) an external layer of CO2
2) an internal layer of cold air
3) a middle layer of alluminium.

I'm trying to realize the mesh without using inflation ( I prefer to have a better quality mesh) and without the method of the central square.

However I can't understand why I'm not obtaining a perfect mesh on two parts, they have the same dimensions and the same constraints.

I improved a little bit my mesh with a MultiZone method, but I'm still having problems.. I'm attaching some screenshots to allow you to better understand what I'm trying to say.

Ansys gives me the error: "The initializisation of the size functions for the pave mesh method failed. Size controls might be not considered correctly on faces with a pave mesh."

Immagine.jpg
1.jpg
2.jpg

What can I do? Do you have any advice for me?

[Gweher]

Hi Paolo,

There are different things that you can check:

• Check if you dont have split edges in your model > select show close vertices or in Spaceclaim use the "find small edge" tool
• Group all the bodies inside one multibody part
• Make sure you have the same edge sizing on all the parallel edges and do not have "conflicts" between different sizings
• Start meshing the "center" core of the half O-grid (the 4 bodies) by rmb > mesh selected bodies > then mesh the remaining ones

If that doesn't work you should maybe help the mapped mesh by specifying the corner vertices in the method.

Have fun

[nettarone]

Originally Posted by Gweher

Hi Paolo,

There are different things that you can check:

• Check if you dont have split edges in your model > select show close vertices or in Spaceclaim use the "find small edge" tool
• Group all the bodies inside one multibody part
• Make sure you have the same edge sizing on all the parallel edges and do not have "conflicts" between different sizings
• Start meshing the "center" core of the half O-grid (the 4 bodies) by rmb > mesh selected bodies > then mesh the remaining ones

If that doesn't work you should maybe help the mapped mesh by specifying the corner vertices in the method.

Have fun

THANK YOU A LOT!!!!!!!!
This "Group all the bodies inside one multibody part" worked for me! .
Thank you again, really,I appreciate that!

[Robinson Rua]

I have two solid bodies but the nodes of the meshes do not coincide on the contact surface. It is possible to modify the mesh by APDL
so that the nodes match

[siw]

You don't need to use APDL for making a node conformal mesh.

As stated above for solid bodies, at the geometry level (e.g. in SpaceClaim) use Shared Topology and that will put the bodies into a MultiBody part in Ansys Meshing. You might find this over-constrains the mesh generation.

If that is not working for you then you need to upload images to view in your posts.

[Robinson Rua]

Wire.JPG


The wire in the center does not coincide in its mesh with the wires that surround it, while those that surround it do coincide in their mesh, I tried what you recommend and it doesn't work either, any help thank you very much.

[siw]

This appears to be for a FEA simulation of a wire rope. It is a non-linear contact simulation where the wires will separate/splay under load?

Perhaps the circular face mesh is too coarse, so it is having difficulty matching the nodes on the central wire.

Decrease the face element size and sweep it along the wires, then you can control the sweep element size so it is not too small. If you're feeling adventurous, splitting each wire geometry for an O-Grid, where the splits are on the tangent locations might be possible. But that is a geometry operation (e.g. SpaceClaim) and I cannot think of the specific way to do that without trying in SpaceClaim.