[famon]

Hi all,

I modeled straight vertical pipe, when I mesh it with boundary layer (including inflation), the quality of inlet is bad, (as seen in 1st picture, but out let quality is good as seen in 2nd picture)
1-How can I fix it?
2-How can I increase number of elements in core?
3-How can I make it structural (hexahedron in surface area?), it all is pyramid and wedge.

[Gweher]

Please use the search toolbar available, there are tons of topics for Hexa mesh of a 3D pipe geometry (I've explained the step-by-step procedure in this topic)

[famon]

Thanks for link dear friend ;-)

[Gweher]

You're welcome. Well for the sake of clarity, I'll answer the questions, hoping it will help other as well.

Originally Posted by famon

1-How can I fix it?

In order to use a "mapped face meshing" method, you need to have 4 "corners", in a pipe configuration the inflation layers will work for the outer part but you still need to deal with the singularity at the "center" of the geometry. One easy way to overcome this issue is to create an O-grid that "splits" the geometry into 5 sub-domains. Each sub-domain has now 4 "corners" allowing the "mapped face meshing" method to "work" (see picture below).

ElbowPipe90.jpg

Originally Posted by famon

2-How can I increase number of elements in core?

You can either use the sizing tool, rmb on Mesh> insert> sizing. Then specify number of elements. Or you can play with meshing parameters under the Sizing tab in the mesh outline tree (Use advanced size functions).

Originally Posted by famon

3-How can I make it structural (hexahedron in surface area?), it all is pyramid and wedge.

See answer 1

[famon]

Originally Posted by Gweher

You're welcome. Well for the sake of clarity, I'll answer the questions, hoping it will help other as well.



In order to use a "mapped face meshing" method, you need to have 4 "corners", in a pipe configuration the inflation layers will work for the outer part but you still need to deal with the singularity at the "center" of the geometry. One easy way to overcome this issue is to create an O-grid that "splits" the geometry into 5 sub-domains. Each sub-domain has now 4 "corners" allowing the "mapped face meshing" method to "work" (see picture below).

Attachment 34786



You can either use the sizing tool, rmb on Mesh> insert> sizing. Then specify number of elements. Or you can play with meshing parameters under the Sizing tab in the mesh outline tree (Use advanced size functions).



See answer 1

Gweher Thanks for the guides, its really unique to slice the model, The meshes are high quality and I can manage more,

[Gweher]

This approach is specific to Ansys Meshing, as the user has less control, you need to help the software by slicing the model into sub-domains. Whereas with ICEM, for instance, you can create an O-grid in just 2 steps without needing to slice you model.

[Tanjina]

Hello,

What will be the best method for meshing a circular round pipe surrounded by porous zone? I am making half geometry using boundary condition. I tried "curvature" and "curvature and proximity".....using curvature I can't get small mesh near pipe and using "curvature and proximity" I get very small discharge through pipe which is not realistic.... any help will be appreciated. I can post photo if that is helpful.

Thanks
Tanjina

[Tanjina]

Here is the geometry.