Mesh conformal

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  • Last Post 22 January 2019
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Muhammed posted this 17 January 2019

Hi everyone.

I'm trying to make a mesh structure for each part in my work. There are implant and cortical bone in the model as you can see from the attached figure. My purpose is to make implant finer mesh and to make cortical bone rougher mesh. However, when I do like that, the nodes don't match.  How can I solve this problem?

Any kinds of help will be appreciated.

Regards,

Muhammed.

 

 

 

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peteroznewman posted this 18 January 2019

The nodes don't have to match. Use bonded contact to connect the faces that touch. You can add a mesh control to the implant body to use smaller elements. You can add a mesh control to have smaller element size on the face of the bone that will be bonded to the implant, and the mesh will grow to a larger size away from the hole.

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Muhammed posted this 18 January 2019

Thank you so much Peter. But I wonder what's the difference btw. conformal and non-conformal mesh. I was doing another work and the nodes didn't match like now. One of the scholar from college said to me make to conformal mesh and I didn't ask the reason for it at that time. I would be very pleased if you explain the reason where we need to make conformal mesh.

Regards,

Muhammed. 

raul.raghav posted this 18 January 2019

In a multi-body part, a conformal mesh ensures that the nodes on both sides of the interface matches. With a non-conformal mesh, the nodes on one side of the interface does not match the nodes on the other side of the interface.

The reason why conformal meshes is preferred over non-conformal meshes: with a conformal mesh there is no (or very little) interpolation at the interface which therefore reduces computational time and ensures higher accuracy of the solution.

Rahul

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Muhammed posted this 18 January 2019

Thank you, Raul. I appreciate your response.

peteroznewman posted this 18 January 2019

Muhammed,

Rahul has given a good explanation of the benefit of a conformal mesh.

If the faces on the two parts are the exact same cylinder, but just have different extents, you can pick the two bodies in the DesignModeler outline and RMB to Form New Part. This puts the two bodies in a Multibody Part and then in the mesher, you will get a conformal mesh. There will only be one set of nodes on the common cylindrical face, and the elements on each side will share them. This is called Shared Topology and means you no longer need Bonded Contact.

This could be a good route, but you will probably end up with a Tet element mesh. If you do a lot of geometry preparation, splitting each body so there is exactly the same face on each part touching, you can apply a Match mesh control and potentially get a Hex element mesh.

Regards,
Peter

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Muhammed posted this 18 January 2019

Thank you so much, Peter. This community is awesome with you!

peteroznewman posted this 21 January 2019

Muhammed,

You are welcome. Next time, click Is Solution on the post that answered your question, which is usually someone other than yourself.

Regards, Peter

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LoGaL posted this 22 January 2019

I would not stick with non conformal mes if you can avoid it.. Where are you generating the part? Design modeler? If yes, open it, select your solids from the menu, right click and then ask for “form new part” Then the mesher will create conformal mesh there

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