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Overset mesh issiue

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Old   July 21, 2017, 13:46
Default Overset mesh issiue
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Antonio Ercoli
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Hi guys , I'm a new member here . I have already seen some thread about the overset mesh, however, I'm not able to solve my problem. I'll explain better. I have to simulate wipers' motion over the windscreen and to do this I used an overset mesh that contains the wipers. The problem is that even if I have made a similar mesh for the background (windscreen) and for the overset boundary, it gives me back the error: "Found 64799 Inactive Faces in Region "Domain". This might be due to too fine or too coarse mesh. Please check cells with Overset Error Status: 30".
There is anyone that can explain to me what problem could it be?
Thank you very much for the help!
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Old   July 22, 2017, 07:51
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Ashok Chaudhari
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This is may be due to boundary of your overset region is close to boundary of background mesh. Try not to move your overset mesh very close to boundary of background mesh. Increase the boundary of background mesh.

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Old   July 23, 2017, 14:15
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Antonio Ercoli
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Thank you for the answer, but I don't understand what do you mean with
Quote:
Increase the boundary of background mesh.
I have made many tests to figure out how to correctly set the overset mesh. In particular, I have tried two different configurations:
1. in the first one I have used an overset that contains only the blade of the wiper;
2. in the second one I have used an overset that contains all the wiper starting from the hinge.
I have set the "Morphing Specification" for the overset to "Displacement", while I impose a "Constraint" for the sliding part of the overset that slides over the windscreen.
Using as "Overset topology" the "Direction" option, none of them was initialized correctly. So I have used an "Automatic" topology option and for the first case, it worked, but not for the second.
Do you have any idea of what problem could it be?
I have added some photos to allow to understand better the problem.

Thank you very much for the help!

[IMG] https://drive.google.com/open?id=0B2...lg4REdYNjNRYkU [/IMG]
[IMG] https://drive.google.com/open?id=0B2...lNVVVhib2o2S2s [/IMG]
[IMG] https://drive.google.com/open?id=0B2...GZHNnpXczZyd0U [/IMG]
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Old   July 25, 2017, 15:46
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Ashok Chaudhari
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Sorry... I did not go such deep into overset mesh.... Increasing boundary means boundary of overset mesh and boundary of background mesh should not be very close. They say that there should be atleast 3 cells between these.

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