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# Mesh Problems

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### Mesh Problems

Posted by You Kiashi at September 14. 2017

I made a mesh as the following:

Mesh type : any

Algorithm: Netgen 1D-2D-3D

Hypothesis: Netgen 3D parameters

Agruments as:   Max. Size 2

Min. Size 0.1

Second Order was checked

Local Size  :  on Edge

value: 0.1

Then , This message came out : #100: during conversion to quadratic, some medium modes were not placed on geometry to avoid distroying elements.

But no excalmatory mark in front of mesh in object browers.

regardes

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### Re: Mesh Problems

Posted by You Kiashi at September 14. 2017

another pic

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### Re: Mesh Problems

Posted by SMESH expert at September 14. 2017

Hello,

The message is a warning, not an error. A bug here is that there is "-100:" instead of "Warning:" in the message.

Best regards

Edward

### Re: Mesh Problems

Posted by You Kiashi at September 15. 2017

Previously SMESH expert wrote:

Hello,

The message is a warning, not an error. A bug here is that there is "-100:" instead of "Warning:" in the message.

Best regards

Edward

How should I deal it ?

It appeared all the time

and the following simulation  was not going well neither.

How could I get  correct mushes  without any error or warning

Thank you for the help

Rona

### Re: Mesh Problems

Posted by SMESH expert at September 15. 2017

That warning appears in a situation similar to that show in a figure below. In this picture a geometrical face is shown in cyan. It has a hole which is meshed very coarsely. When making this linear mesh second order, medium nodes of 1d elements dicretizing the hole will be placed on the hole boundary thus making 2D elements adjacent to the hole distorted. A mean to avoid this distorting is that those medium nodes are placed not on the hole boundary but in the middle of 1D element. The warning notifies you about this situation.

To avoid such a problem, the mesh should be refined enough in concave regions.

Best regards

Edward

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