{"id":292691,"date":"2023-07-12T07:36:20","date_gmt":"2023-07-12T07:36:20","guid":{"rendered":"\/forum\/forums\/reply\/292691\/"},"modified":"2023-07-12T07:36:20","modified_gmt":"2023-07-12T07:36:20","slug":"292691","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/292691\/","title":{"rendered":"Reply To: Why FDE Eigen mode solver is giving different solution than Comsol FEM solver?"},"content":{"rendered":"<p>&lt;p&gt;Sorry, I didn&#8217;t understand the simulation region, you meant for selecting the whole waveguide or only the portion of the region where the circular bulge is there? The FDE selects only the cross sectional region, not the entire 3D geometry.&lt;\/p&gt;&lt;p&gt;Which boundary conditions must be used here ? please suggest metal or PML? How to use the symmetric BCs ?&lt;\/p&gt;&lt;p&gt;Yes, the frequency is same.&lt;\/p&gt;&lt;p&gt;Have a doubt regarding mesh, currently I am using a selective meshing for the circular bulge of the waveguide, Should I use this selective meshing in whole 3D region or until the FDE region is fine ?&lt;\/p&gt;&lt;p&gt;Still no improvements in my results.!&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/07\/12-07-2023-1689147376-mceclip0.png\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-292691","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Sorry, I didn&#039;t understand the simulation region, you meant for selecting the whole waveguide or only the portion of the region where the circular bulge is there? The FDE selects only the cross sectional region, not the entire 3D geometry.Which boundary conditions must be used here ? please suggest metal or PML? How to use\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/292691\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Reply To: Why FDE Eigen mode solver is giving different solution than Comsol FEM solver? | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Sorry, I didn&#039;t understand the simulation region, you meant for selecting the whole waveguide or only the portion of the region where the circular bulge is there? The FDE selects only the cross sectional region, not the entire 3D geometry.Which boundary conditions must be used here ? please suggest metal or PML? How to use\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/292691\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2023\/07\/12-07-2023-1689147376-mceclip0.png\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2023\/07\/12-07-2023-1689147376-mceclip0.png\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2023-07-12T07:36:20+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2023-07-12T07:36:20+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: Why FDE Eigen mode solver is giving different solution than Comsol FEM solver? | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Sorry, I didn&#039;t understand the simulation region, you meant for selecting the whole waveguide or only the portion of the region where the circular bulge is there? The FDE selects only the cross sectional region, not the entire 3D geometry.Which boundary conditions must be used here ? please suggest metal or PML? 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