[ICEM] How to mesh sharp corners in ICEM CFD

abhilasht · September 12, 2018, 13:43

I`m trying to mesh the geometry attached using quad-hex cells. I`m facing problem at sharp corners and hence mesh is showing a quality of 0.01. Please give a look and suggest how to improve quality in this.

Gert-Jan · September 13, 2018, 05:29

What do I see in the picture? I see geometry lines, and blocking lines? What is which?

abhilasht · September 18, 2018, 03:41

Dear Gert-Jan,

I`m attaching .Zip file with all details. I`m unable to get good quality mesh using quad-hex cells. Can you help me with this.

bluebase · September 18, 2018, 05:27

Hi Abhi,

have a look into the sticky post of this subforum (again). There you'll find an awesome guide called: Simon’s tips and trick on ICEM CFD
On slide 97 and 98 you'll find a similar problem solved with different methods.

The problem is, plain hexa is not suited for such corners. Try to understand why the quality criterion returns 0.01? Also check against skewness, and determinant, try to understand what these quantities mean. By then, you'll understand why a rectangle squeezed to almost a line will result in bad quality criterion.

Best regards,
Sebastian

abhilasht · September 20, 2018, 01:30

Dear Sebastian,

I tried that option but quality is not going beyond 0.04.

Best Regards,
Abhi

abhilasht · October 7, 2018, 08:08

Dear Sebastian,

Thanks for help. Got the quality to 0.22.

Best Regards,

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September 13, 2018, 05:29		#2
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,827 Rep Power: 27	What do I see in the picture? I see geometry lines, and blocking lines? What is which?

September 18, 2018, 05:27		#4
bluebase Senior Member Sebastian Engel Join Date: Jun 2011 Location: Germany Posts: 566 Rep Power: 20	Hi Abhi, have a look into the sticky post of this subforum (again). There you'll find an awesome guide called: Simon’s tips and trick on ICEM CFD On slide 97 and 98 you'll find a similar problem solved with different methods. The problem is, plain hexa is not suited for such corners. Try to understand why the quality criterion returns 0.01? Also check against skewness, and determinant, try to understand what these quantities mean. By then, you'll understand why a rectangle squeezed to almost a line will result in bad quality criterion. Best regards, Sebastian

September 20, 2018, 01:30		#5
abhilasht New Member Abhi Join Date: Jan 2018 Posts: 27 Rep Power: 8	Dear Sebastian, I tried that option but quality is not going beyond 0.04. Best Regards, Abhi

October 7, 2018, 08:08		#6
abhilasht New Member Abhi Join Date: Jan 2018 Posts: 27 Rep Power: 8	Dear Sebastian, Thanks for help. Got the quality to 0.22. Best Regards,