{"id":295683,"date":"2023-07-31T14:54:27","date_gmt":"2023-07-31T14:54:27","guid":{"rendered":"\/forum\/forums\/reply\/295683\/"},"modified":"2023-07-31T14:54:27","modified_gmt":"2023-07-31T14:54:27","slug":"295683","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/295683\/","title":{"rendered":"Reply To: Why FDE Eigen mode solver is giving different solution than Comsol FEM solver?"},"content":{"rendered":"<p>&lt;p&gt;FDE solves mode profiles of an infinite waveguide, which is on a cross section.&lt;\/p&gt;&lt;p&gt;Yours is a cavity, as I pointed out previously it is similar to WGM. Thus you need to excite the cavity and pick up the correct modes. Maybe the 3rd party can solve cavity modes. But FDE is only from waveguide cross section, not for cavity. Only 3DFDTD can simulate 3D cavity. Please refer WGM examples online.&lt;\/p&gt;&lt;p&gt;FDE calculates the modes at any cross section you specified. It assumes 3rd dimension is infinite.&lt;\/p&gt;&lt;p&gt;I hope this clarifies.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-295683","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=\"FDE solves mode profiles of an infinite waveguide, which is on a cross section.Yours is a cavity, as I pointed out previously it is similar to WGM. Thus you need to excite the cavity and pick up the correct modes. Maybe the 3rd party can solve cavity modes. But FDE is only from waveguide cross\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/295683\/\" \/>\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=\"FDE solves mode profiles of an infinite waveguide, which is on a cross section.Yours is a cavity, as I pointed out previously it is similar to WGM. Thus you need to excite the cavity and pick up the correct modes. Maybe the 3rd party can solve cavity modes. But FDE is only from waveguide cross\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/295683\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2023-07-31T14:54:27+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2023-07-31T14:54:27+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=\"FDE solves mode profiles of an infinite waveguide, which is on a cross section.Yours is a cavity, as I pointed out previously it is similar to WGM. Thus you need to excite the cavity and pick up the correct modes. Maybe the 3rd party can solve cavity modes. But FDE is only from waveguide cross\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/295683\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/295683\\\/#listItem\",\"name\":\"Reply To: Why FDE Eigen mode solver is giving different solution than Comsol FEM solver?\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/295683\\\/#listItem\",\"position\":2,\"name\":\"Reply To: Why FDE Eigen mode solver is giving different solution than Comsol FEM solver?\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/295683\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/295683\\\/\",\"name\":\"Reply To: Why FDE Eigen mode solver is giving different solution than Comsol FEM solver? | Ansys Learning Forum\",\"description\":\"FDE solves mode profiles of an infinite waveguide, which is on a cross section.Yours is a cavity, as I pointed out previously it is similar to WGM. 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