How to disable "Localized Element Sizing"

[Alauddin108]

Hi,
I am a Structural Engineer and trying to use this "TQMesh" library in my applications. In my case, there are sharp corners and I found TQMesh refining the mesh size and number of elements are becoming to big. However, I do not need to refine the mesh size near sharp corners for my particular use. Is it possible to disable "Localized Element Sizing" ? I would appreciate if you can give me some advice about it.

With best regards,

Dr. M Alauddin Biswas
Toronto, Canada.

[FloSewn]

Hi Alauddin,

thank you for your interest in this little project.

Could it be that the edges near those sharp corners are very short? Because the element size is primarily estimated from the length of boundary edges.
A simple way to change this behavior at specific edges, is by adjusting the size and range parameters of the respective vertices at these edges, e.g.:

Vertex& v = domain.add_vertex( x, y, size, range );

where size controls the local element size and range controls the extent around the vertex where this size is applied.
For your problem, it might be helpful to adjust only the range parameter to smaller values.
This can be achieved by setting the size parameter to zero, e.g.:

Vertex& v = domain.add_vertex( x, y, 0.0, range );

Now the element size at edges adjacent to this vertex will still be estimated from their lengths (which supports the meshing process) but the elements nearby are allowed to grow faster.

If this doesn't help and you would like to change the actual calculation of the element size, you can have a look at the file src/algorithm/Domain.h.
In that file, the class SizeFunction and its function evaluate() implements the calculation of the size function.

Best regards,
Flo

[Alauddin108]

Hi FloSewn, Sorry for delay in responding your reply. Thank you for your time in replying my email with very detail and useful information. You said little project but, I found it very useful, unique and powerful library for meshing. If you can implement/add "point" and "line" constraint (like in Triangle library) in your "TQMesh" library then it will be more powerful & useful for general use. I will follow your suggestions to overcome the problems, currently, I am having. I may contact you in the future with more information after trying your suggestions. With best regards, Dr. M Alauddin Biswas Toronto, Canada

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________________________________ From: Florian Setzwein ***@***.***> Sent: Wednesday, April 24, 2024 1:17 AM To: FloSewn/TQMesh ***@***.***> Cc: Alauddin108 ***@***.***>; Author ***@***.***> Subject: Re: [FloSewn/TQMesh] How to disable "Localized Element Sizing" (Discussion #27) Hi Alauddin, thank you for your interest in this little project. Could it be that the edges near those sharp corners are very short? Because the element size is primarily estimated from the length of boundary edges. A simple way to change this behavior at specific edges, is by adjusting the size and range parameters of the respective vertices at these edges, e.g.: Vertex& v = domain.add_vertex( x, y, size, range ); where size controls the local element size and range controls the extent around the vertex where this size is applied. For your problem, it might be helpful to adjust only the range parameter to smaller values. This can be achieved by setting the size parameter to zero, e.g.: Vertex& v = domain.add_vertex( x, y, 0.0, range ); Now the element size at edges adjacent to this vertex will still be estimated from their lengths (which supports the meshing process) but the elements nearby are allowed to grow faster. If this doesn't help and you would like to change the actual calculation of the element size, you can have a look at the file src/algorithm/Domain.h. In that file, the class SizeFunction and its function evaluate() implements the calculation of the size function. Best regards, Flo — Reply to this email directly, view it on GitHub<#27 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/BASZDKHZJJOD7J367U2OPLDY6456LAVCNFSM6AAAAABGRTREHKVHI2DSMVQWIX3LMV43SRDJONRXK43TNFXW4Q3PNVWWK3TUHM4TEMBYGIZTM>. You are receiving this because you authored the thread.

[angelmusonda]

Indeed a feature to define fixed edges inside the domain would be very helpful.