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Drawing a triangular hole in a cuboid

Posted Jul 18, 2019, 8:22 a.m. EDT Structural & Acoustics, Computational Fluid Dynamics (CFD), Geometry 3 Replies

Aashna Raj
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How can I draw a triangular hole in a rectangular channel? I am currently creating a 2D workplane and after drawing the required geometry in 2D, I am using the difference option. But the triangular region is not being selected. If this would have worked, I would have then used the extrude option.

If anyone has idea regarding this, kindly help.

3 Replies Last Post Jul 19, 2019, 8:36 a.m. EDT
Jeff Hiller COMSOL Employee

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Posted: 5 years ago Jul 18, 2019, 4:03 p.m. EDT
Updated: 5 years ago Jul 18, 2019, 3:54 p.m. EDT

Can you upload your mph file?

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Jeff Hiller
Can you upload your mph file?
Aashna Raj
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Posted: 5 years ago Jul 19, 2019, 12:51 a.m. EDT
Updated: 5 years ago Jul 19, 2019, 12:48 a.m. EDT

Yes.

Yes.

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Jeff Hiller COMSOL Employee

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Posted: 5 years ago Jul 19, 2019, 8:36 a.m. EDT
Updated: 5 years ago Jul 19, 2019, 8:27 a.m. EDT

Hi Aashna,

The issue is that before you can subtract a triangle from a rectangle, you need to have a triangle, and in your file there are segments that visually do form a triangle but you have not told the software that you want those three segments turned into a solid triangle. You can do that by converting the three segments into a curve, and then converting the resulting curve into a solid. Then you can select the triangle as the object to subtract from the rectangle.

See the attached file, where I did this for both triangles simulataneously.

Best,

Jeff

PS: If you are starting with COMSOL, I highly recommend binge watching the videos on our Learning Center

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Jeff Hiller
Hi Aashna, The issue is that before you can subtract a triangle from a rectangle, you need to have a triangle, and in your file there are segments that visually do form a triangle but you have not told the software that you want those three segments turned into a solid triangle. You can do that by converting the three segments into a curve, and then converting the resulting curve into a solid. Then you can select the triangle as the object to subtract from the rectangle. See the attached file, where I did this for both triangles simulataneously. Best, Jeff PS: If you are starting with COMSOL, I highly recommend binge watching the videos on our [Learning Center](https://www.comsol.com/learning-center)

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