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Convergence problem in RF module

Posted 2013年4月1日 GMT-4 07:16 Materials, Studies & Solvers Version 5.1 3 Replies

Debadrita Paria
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I am doing some plasmonics simulation using silver nano particles in comsol. For silver particle convergence is either very very slow or there is no convergence in most cases for some specific wavelengths. The same model works fine for gold nano particles. Kindly help.
3 Replies Last Post 2017年1月20日 GMT-5 11:44
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Hello Debadrita Paria

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Shuai Hou
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Posted: 10 years ago 2014年9月23日 GMT-4 23:11
Please try the direct solver instead of the iterative solver. I had exactly the same problem (extremely slow convergence at about 360 nm for a silver nanocrystal), and the direct solver worked perfectly.
Please try the direct solver instead of the iterative solver. I had exactly the same problem (extremely slow convergence at about 360 nm for a silver nanocrystal), and the direct solver worked perfectly.
Seojoo Lee
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Posted: 7 years ago 2017年1月20日 GMT-5 11:10
I was stuck in same problem.
Thanks for your comment. !
I was stuck in same problem. Thanks for your comment. !
Walter Frei COMSOL Employee

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Posted: 7 years ago 2017年1月20日 GMT-5 11:44
Hello All,

Having to use a direct solver is also often a sign that you've undermeshed the problem, especially in the silver material domains.
If you're dealing with a model that has lossy materials, please read:
www.comsol.com/blogs/modeling-of-materials-in-wave-electromagnetics-problems/
www.comsol.com/blogs/simulation-tools-for-solving-wave-electromagnetics-problems/

Meshing more finely may improve solution speed when using the iterative solver (and although a more finely meshed problem will use more memory, the iterative solver uses much less memory that the direct solver, so you generally come out ahead.)

Best Regards,
Hello All, Having to use a direct solver is also often a sign that you've undermeshed the problem, especially in the silver material domains. If you're dealing with a model that has lossy materials, please read: https://www.comsol.com/blogs/modeling-of-materials-in-wave-electromagnetics-problems/ https://www.comsol.com/blogs/simulation-tools-for-solving-wave-electromagnetics-problems/ Meshing more finely may improve solution speed when using the iterative solver (and although a more finely meshed problem will use more memory, the iterative solver uses much less memory that the direct solver, so you generally come out ahead.) Best Regards,

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