Dependence of mesh on contacts and joints

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  • Last Post 30 January 2020
Rjimenez posted this 12 March 2019

I have a general question on mesh dependency that I have not been able to answer through documentation.

I have noticed that sometimes when modifying a contact or a joint in Mechanical, the mesh generated for the corresponding parts is erased and a new mesh is needed. I am attributing this to a underlying dependency of mesh automatic controls on this, nevertheless I would like to find some documentation on this.

Has anyone experienced this too?

 

Cheers

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peteroznewman posted this 12 March 2019

What kind of modification are you making on a joint?  

When modifying contact properties, such as type of contact, I have not seen any remesh required.

Can you show an example of a change in contact or joint that causes a remesh?

whiew posted this 30 January 2020

Sorry for hijacking the topic. I am happy to create a new topic if deemed necessary. Please advise.

I recently changed jobs and on the new work PC (running ANSYS 2019 R3), I have encountered the same phenomenon. This was not occurring in my previous workplace's PC (running ANSYS 2019 as well). I don't recall encountering this issue previously; having used multiple different work PC for ANSYS and multiple versions.

Admittedly, I am currently dealing a lot more with surface models at this workplace instead of solids, hence, having to set up contacts a bit more diligently (nothing complicated; only selecting top/bottom shell face, turning on shell thickness effect, adding offset (no ramping) for frictionless contacts).

Whenever I add a new contact (example selecting 2 faces and adding a manual contact), the mesh requires remeshing. Here I was thinking, it might be because I am dealing with surface models. Could it be something to do with the default setup of mesh, etc.?

I can provide screenshots of the settings if required.

TIA.

peteroznewman posted this 30 January 2020

The best practice is to mesh last, after all the contacts are defined.

ANSYS Mechanical keeps track of when the mesh becomes invalid. Adding or modifying contacts can change a valid mesh to invalid and require a remesh.

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