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Convergence problem in RF module

Posted Apr 1, 2013, 7:16 a.m. EDT 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 Jan 20, 2017, 11:44 a.m. EST
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Hello Debadrita Paria

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Shuai Hou
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Posted: 1 decade ago Sep 23, 2014, 11:11 p.m. EDT
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: 8 years ago Jan 20, 2017, 11:10 a.m. EST
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: 8 years ago Jan 20, 2017, 11:44 a.m. EST
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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