Improving aspect ratio

Altair Forum User

Hi,

 

What is the procedure to improve aspect ratio after identing elements which are highlighted, please?

 

 

<?xml version="1.0" encoding="UTF-8"?>

Altair Forum User

You can modify element size in this area to reduct the aspect ratio, so a local remesh is needed.

On your screenshot, the aspect threshold is only 3.0 which is not so bad for me.

Practically, I can accept max aspect ratio about 5.0 for Samcef, Nastran, LS-Dyna solvers.

Altair Forum User

Thanks. WQould you use tetraremish>retrieve but then I don't see an option to adapat element size?

Altair Forum User

Altair Forum User said:

Thanks. WQould you use tetraremish>retrieve but then I don't see an option to adapat element size?

 

Your mesh is tet solid mesh? If yes, so you have to remesh firstly surface.

Altair Forum User

So after I find the error elements...I should rmesh only the surface elements  first and then the 3D mesh will update automatically?

 

I did that but I still get other bad elements. Is there a way to make sure that the output mesh turns out ok?

Altair Forum User

What's your quality criterion? Aspect ratio < 3 ?

Could you share the model HM?

Altair Forum User

https://www.dropbox.com/s/ecw4vxujr3dddfz/cart.hm?dl=0

 

This is only one part. I have many similar geometries to mesh.

 

Yep aspect ratio less than 3

 

Thanks a lot

Altair Forum User

Altair Forum User said:

https://www.dropbox.com/s/ecw4vxujr3dddfz/cart.hm?dl=0

 

This is only one part. I have many similar geometries to mesh.

 

Yep aspect ratio less than 3

 

Thanks a lot

 

Here's my test. From your solid, I extract the surfaces and I work on them.

 

For internal edges, you can disable some of them to reduct meshing constraint.

I come to mesh with about 0,195% aspect ratio > 3 (solid mesh). That's  completely small. See my attached files.

 

HTH,

<?xml version="1.0" encoding="UTF-8"?>

Unable to find an attachment - read this blog

Altair Forum User

Thanks. This mesh works well in msc marc.

Your technique works well for getting a good quality mesh.

Would you wind explaining how you got the surfaces from the original part please?

 

I need to do this with all my parts.

 

Thanks

Altair Forum User

Altair Forum User said:

Thanks. This mesh works well in msc marc.

Your technique works well for getting a good quality mesh.

Would you wind explaining how you got the surfaces from the original part please?

 

I need to do this with all my parts.

 

Thanks

 

Here're steps to follow:

• Show your solid part

Create a new component (it's current component)

Geometry => Organize => Surface : select all surface of your part => 'copy' (dest component = your new comp)