Meshing

Altair Forum User

Hello Everyone

 

I have a buit weird geometry which I need to mesh. For that I used normal 'size and bias' method and then tried to clean up till quality index of 30. I have couple of questions.

1.) Could you please check my 2D mesh and tell me if it looks okay or not.

2.) Secondly, how do I make a 3D mesh now out of this surfaces.

 

Thanks in advance

 

Altair Forum User

Hi Novak,

 

may i know the purpose of 3D mesh?

 

Thank you

Altair Forum User

The container is a 3D object, so I need it to be a solid. I am trying to mesh it with tetramesh, but it doesn't seem to mesh all the solids.

 

Thanks

 

Altair Forum User

The model is not enclosed. Hence, you are not able to perform 3D mesh. I suggest you to go with 2D mesh only, its better.

 

Thank you.

Altair Forum User

But I can't. The model is solid, it needs to be 3D meshed. Could you please tell me how to enclose the volume.

Thanks

 

Altair Forum User

Delete your 2d mesh. And try volume tetra mesh.

 

Thank you

Altair Forum User

well I m suppose to first to the 2D meshing and then use that mesh to create a 3D. I am not suppose to use volume tetra directly. Also, the meshing with volume tetra won't be as good as tetramesh.

 

Altair Forum User

first please check your geometry and make sure there are no free edges and no missing surfaces (fill the missing gaps).

 

Thank you.

Altair Forum User

I have sent you a file by email. I did remeshing with size and bias panel. I checked for free edges and there are none. However, when I try to do tetramesh, 3D meshing is not performed.

Please have a look

 

Thanks

 

Altair Forum User

Now tetramesh seems to work actually, but could you please check how can I make it look bit better.

 

Thanks

 

Altair Forum User

I think your mesh looks perfect. You can go ahead with this.

 

Thank you

Altair Forum User

Okay! Thanks for your help

I have another very similar model in which as I try to tetramesh, there are some error elements. When I try to toggle them, lots of free edges come out. Could you please have a look at the model and tell me the solution. Really getting stuck at it.

 

Thanks

 

Altair Forum User

Hi,

 

I don't see any point for 3D mesh for this component. This is a plastic component. You need to extract mid surface, clean-up the geometry and mesh with shell elements.

 

Thank you

Altair Forum User

Hi

 

Well I see your point but the task is to do the 3D mesh. I don't really have the option which you are talking about. Could you please tell me how to perform 3D mesh

 

Thanks

 

Altair Forum User

Please reply. It is bit urgent

 

Thanks

 

Altair Forum User

Hi Novak

 

The component thickness is very less, ribs thickness is around 1.5mm. So, it is not possible to allocate 3D elements. You need go with 2D mesh only.

 

Thank You

Altair Forum User

@Novak

 

There are self-intersection points which makes meshing with 3D difficult. Refine the geometry and use a very small element size or extract the mid-surface and 2D mesh it... Up to you... 

Altair Forum User

Hi @Novak

 

 

As said it is always better to extract mid surface and use 2D elements for modeling for such components.  If at all you need to 3D mesh it make-sure you have a completely closed volume of mesh.

 

One other way is 2D mesh the component with Shrink wrap which makes the component closed for tetra meshing. But this may not capture the component properly. 

Altair Forum User

Apart from that, I see a lot of intersections in geometry which may not help with 3D meshing. 

Altair Forum User

Is there no quick way to get rid of those interesections?

 

Altair Forum User

For CAD there is no option to get rid of intersections in HM.

 

Try with a professional CAD tool.