{"id":292154,"date":"2023-07-09T08:14:12","date_gmt":"2023-07-09T08:14:12","guid":{"rendered":"\/forum\/forums\/topic\/why-fde-eigen-mode-solver-is-giving-different-solution-than-comsol-fem-solver\/"},"modified":"2023-07-09T08:14:12","modified_gmt":"2023-07-09T08:14:12","slug":"why-fde-eigen-mode-solver-is-giving-different-solution-than-comsol-fem-solver","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/why-fde-eigen-mode-solver-is-giving-different-solution-than-comsol-fem-solver\/","title":{"rendered":"Why FDE Eigen mode solver is giving different solution than Comsol FEM solver?"},"content":{"rendered":"<p>Please see the below screen shot which has two different results solved from two different eigen mode solvers<\/p>\n<ol>\n<li>FEM solver in comsol<\/li>\n<li>FDE eigen mode solver in Lumerical<\/li>\n<\/ol>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/07\/09-07-2023-1688890276-Ansys_ques.PNG\" alt=\"\"><\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/07\/09-07-2023-1688890291-Ansys_ques1.PNG\" alt=\"\"><\/p>\n<p>&nbsp;<\/p>\n<p>The results from the Comsol FEM are promising with the our physics and the mathematical modeling. But when we go for the same study in Lumerical FDE eigen mode solver, we see completely different results. Why the results are differemt ? Please kindly suggest and give your inputs on this.<\/p>\n<p>The FEM comsol results are based on 2D axi-symmetric structure using weak-form PDE where as the Lumerical structure is 3D.<\/p>\n<p>The mesh size in comsol is 5 nm and the mesh size in Lumerical is 1 pm. The boundary conditions used in comsol are PML and where as in Lumerical I tried with Metal and PML both.<\/p>\n","protected":false},"template":"","class_list":["post-292154","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["260593","2592"],"_bbp_author_ip":["23.217.200.71"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["1671"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["292154"],"_bbp_forum_id":["27833"],"_bbp_engagement":["2592","260593"],"_bbp_voice_count":["2"],"_bbp_reply_count":["17"],"_bbp_last_reply_id":["295811"],"_bbp_last_active_id":["295811"],"_bbp_last_active_time":["2023-08-01 06:11:20"]},"test":"schejarlasmail-iitm-ac-in"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/292154","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/292154\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=292154"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}