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How to export/save the thermal expansion

Posted 7 dic 2009, 06:33 GMT-5 2 Replies

Simon True
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Hi,
I am doing the thermal stress analysis of a glass mirror. How do I extract the deformation (or the displacement) values at each grid point after analysis? Basically I am interested to know the change in radius of curvature of the mirror before and after the thermal expansion.

Thanks,
Sim
2 Replies Last Post 20 gen 2010, 22:11 GMT-5
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Hello Simon True

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Moritz Naumann
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Posted: 1 decade ago 20 gen 2010, 04:41 GMT-5
Hello Simon,

actually I am also building a model of a glass mirror. I want to investigate the thermal influence to the surface deformation of the mirror and I also need to export the deformation in the end.

Did you already succeed in exporting the data? Under File->Export->Postprocessing Data I can Export Coordinates, but I don´t know how to export the coordinates of exactly the surface or subdomain I am interested in!

Regards,
Moritz
Hello Simon, actually I am also building a model of a glass mirror. I want to investigate the thermal influence to the surface deformation of the mirror and I also need to export the deformation in the end. Did you already succeed in exporting the data? Under File->Export->Postprocessing Data I can Export Coordinates, but I don´t know how to export the coordinates of exactly the surface or subdomain I am interested in! Regards, Moritz
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 20 gen 2010, 22:11 GMT-5
Hi
You can export the deformations into matlab, one way is to take a look on the discussion thread "" this is for eigenmodes but the deformations ramin deformations:)

Matlab script for effective modal mass extraction

You have also some clues in the "Model Exchange" (and a few discussions threads, serach for Zernike) where I have dumped a very preliminary Zernike analysis of a deformed surface, that I use for mirror gravity and thermal deformation analysis. It is rather straightforward, but length to extend to further zernike elements. Pls note that there is a normalisation issue to consider depending on which optical software you are comparing your results with. And that the Zernike are correctly normalised only for circular, non hollow, shapes.

There are quite some info in the threads, try the "search" it can extract several nice suggestions

Good luck
Ivar
Hi You can export the deformations into matlab, one way is to take a look on the discussion thread "" this is for eigenmodes but the deformations ramin deformations:) Matlab script for effective modal mass extraction You have also some clues in the "Model Exchange" (and a few discussions threads, serach for Zernike) where I have dumped a very preliminary Zernike analysis of a deformed surface, that I use for mirror gravity and thermal deformation analysis. It is rather straightforward, but length to extend to further zernike elements. Pls note that there is a normalisation issue to consider depending on which optical software you are comparing your results with. And that the Zernike are correctly normalised only for circular, non hollow, shapes. There are quite some info in the threads, try the "search" it can extract several nice suggestions Good luck Ivar

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