[ICEM] Make elements respect/follow curves on surface

Neelay Doshi · January 22, 2020, 05:35

Hi everyone,
I have a simple cuboidal geometry which has 'Y' shaped curves on 4 surfaces (image-1, 2). I wish to create a structured mesh such that it captures the 'Y' shape on the surface. I have tired to creat a simple mesh (image-3) but the elements become extremely skewed.

I even tried to create a degenerate block with its vertices at the 'V' section of 'Y' and then resolve it with a 'y-grid' within but the 2 degenerate blocks being perpendicular to eachother form a prymid at the centre which I don't think can be resolved by structured mesh.

Kindly guide me through the procedure of creating a bettre mesh.

Thank you !

Gert-Jan · January 23, 2020, 04:19

Your Y-geometry has 3 angles of around 120°. You can't do better than that. If you want a more orthogonal mesh, you need to change your geometry.

Neelay Doshi · January 23, 2020, 07:41

Quote:

Originally Posted by Gert-Jan

If you want a more orthogonal mesh, you need to change your geometry.

Thank you for your prompt reply.
I have made a very primitive mesh, I haven't used 0-grid, Y-grid etc in the mesh picture I have posted.

I cannot change the geometry, but could any of the advance meshing techniques mentioned above help capture the geometry?
(as mentioned in the post, I tried using Y-grid but it failed)

Gert-Jan · January 23, 2020, 07:54

In your geometry, the elements can't get skewed more than your geometry.
If you apply a fancy blocking (whish is possible) then on average the skewness will improve, but the nasty angles of 60 in the corners will remain. So this won't help.

What is the goal of your calculation? Is is flow or mechanical?

Neelay Doshi · January 23, 2020, 08:05

Quote:

Originally Posted by Gert-Jan

If you apply a fancy blocking (whish is possible) then on average the skewness will improve, but the nasty angles of 60 in the corners will remain. So this won't help.

Skewness isn't an issue as long as the solver accepts it. If it is possible by some advanced technique then kindly share the meshing technique.

Quote:

Originally Posted by Gert-Jan

Is is flow or mechanical?

It is flow

Gert-Jan · January 23, 2020, 08:30

CFX is happy to handle these elements. No doubt about that.
Fluent probably as well, but it is less forgiven.

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January 23, 2020, 04:19		#2
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,827 Rep Power: 27	Your Y-geometry has 3 angles of around 120°. You can't do better than that. If you want a more orthogonal mesh, you need to change your geometry.

January 23, 2020, 07:54		#4
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,827 Rep Power: 27	In your geometry, the elements can't get skewed more than your geometry. If you apply a fancy blocking (whish is possible) then on average the skewness will improve, but the nasty angles of 60 in the corners will remain. So this won't help. What is the goal of your calculation? Is is flow or mechanical?

January 23, 2020, 08:30		#6
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,827 Rep Power: 27	CFX is happy to handle these elements. No doubt about that. Fluent probably as well, but it is less forgiven.