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Old   July 16, 2020, 12:38
Default Interface problem
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I am doing a project on developing a Wankel compressor. I have written a UDF code for the eccentric motion of the rotor and another one for the housing to enable the nodes of the housing wall to move in sync with the speed of the rotor apexes.
The geometry was created in solidworks and the ports are circular extrusions that were not merged with the main body so that they can be kept as seperate bodies.
In my mesh I have defined the contact region between the ports and the housing.
When I run the simulation, I get an error saying "negative volume cell volume detected" and "Warning: Failed to correct face handedness ".
When I previewed the mesh motion at the time step it failed, the face of the outlet port that was defined in the contact region with the housing was moving when it should be stationary. I have not given it a mesh motion and am not sure what to do. I have attached a picture link below.

Please advice.
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Old   July 17, 2020, 02:28
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AlexanderZ will become famous soon enoughAlexanderZ will become famous soon enough
why don't you want to make all geometry as one part, without contacts?
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Old   December 30, 2021, 03:31
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Originally Posted by AlexanderZ View Post
why don't you want to make all geometry as one part, without contacts?
This is necessary because the small apex clearances require the fine mesh density, but the rest of the Wankel expander does not. If the entire mesh density were as fine as the apex clearances, the computational time would be unfeasibly large.
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dynamic mesh zones, mesh interface rotating, port flow

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