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Problems with geometry quality
Posted Aug 28, 2019, 4:14 p.m. EDT Geometry, Mesh Version 5.2a 4 Replies
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Hello. First of all i am fairly new comsol user. Currently i am studying heating of fused silica fibers (https://en.wikipedia.org/wiki/Optical_fiber) for purposes of laser applications. Typical optical fiber is very thin cylinder (diameter is 125 um) with big length (1 m and much more). So this is the place where the problem appears. I draw a fiber with lenght of 1.5 mm and diameter of 125 um and comsol manage it very good (see two files "Length_1500um_General View.jpg" and "Length_1500um_Transverse View.jpg"). But fiber with length of 1 m looks very low poly and modeling heating in such geometry is worthless ("Length_1m_General View.jpg" and "Length_1m_Transverse View.jpg"). Is there any mean to make comsol maintain quality in this situation?
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This is a rendering effect due to the high aspect ratio, and it has been discussed before in this Discussion Forum, see e.g. https://www.comsol.com/forum/thread/77211/object-shape-changing-due-to-high-aspect-ratio?last=2015-05-19T18:02:19Z .
The cross section of your geometric object is still a circle even if it does not look that way on screen. This will become obvious when you mesh one of the end surfaces of your fiber.
Best regards,
Jeff
-------------------Jeff Hiller
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This is a rendering effect due to the high aspect ratio, and it has been discussed before in this Discussion Forum, see e.g. https://www.comsol.com/forum/thread/77211/object-shape-changing-due-to-high-aspect-ratio?last=2015-05-19T18:02:19Z .
The cross section of your geometric object is still a circle even if it does not look that way on screen. This will become obvious when you mesh one of the end surfaces of your fiber.
Best regards,
Jeff
Thank you. I will look through your link.
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Here is a better link on the same topic: https://www.comsol.com/forum/thread/36108/geometry-of-a-cylinder?last=2013-07-04T06:45:03Z
Jeff
-------------------Jeff Hiller
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In topic (https://www.comsol.com/forum/thread/77211/object-shape-changing-due-to-high-aspect-ratio?last=2015-05-19T18:02:19Z ) Daniel Connelly suggest to use scaling rules to extend solution to longer lengths but i do not know how to do it. How to apply these rules in comsol?