{"id":356515,"date":"2024-03-11T22:33:04","date_gmt":"2024-03-11T22:33:04","guid":{"rendered":"\/forum\/forums\/topic\/how-to-set-the-correct-simulation-time-in-3d-fdtd-simulation\/"},"modified":"2024-03-12T00:05:26","modified_gmt":"2024-03-12T00:05:26","slug":"how-to-set-the-correct-simulation-time-in-3d-fdtd-simulation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-set-the-correct-simulation-time-in-3d-fdtd-simulation\/","title":{"rendered":"How to set the correct simulation time in 3D FDTD simulation?"},"content":{"rendered":"<p>Hi everyone<\/p>\n<p>I do 3D FDTD simulations and I have a problem with the simulation time. I don&#8217;t know how to set the correct simulation time. The only information that I found is from the link \/forum\/forums\/topic\/how-to-estimate-the-simulation-time-for-an-fdtd-file\/<\/p>\n<p>In my simulation the source injects the light in a waveguide in the x direction with a total waveguide length of 260um. The refractive index of the material is 2.06 and the speed of light is 3e8. So according to the previous link, the simulation time should be<\/p>\n<p>time = (x_distance <em> n_refrac)\/c = (260e-6 * 2.06)\/3e8 = 178.53 fs<\/em>&nbsp;<\/p>\n<p>To be honest, I put much higher simulation time in my simulation. Actually, I put 2000fs but after my simulation run, I got status 1 which means that the simulation didn&#8217;t reach the autoshutoff level.&nbsp;<\/p>\n<p>Apart from the above site, I found this https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360034382594-Understanding-Mesh-Refinement-and-Conformal-Mesh-in-FDTD<\/p>\n<p>In that site I found that the simulation time for 3D is ~ V(lamda\/dx)^4 which I guess that V is the volume of the FDTD region, lamda is the wavelength and dx is the mesh in x axis. So, in my simulation that formula is equal to ~274869499fs, which I think it is not correct.&nbsp;<\/p>\n<p>Could you help me find the correct simulation time?<\/p>\n<p>Apart from that I also have another question. Just to make it sure. fs means femtosecond, right?<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/03\/11-03-2024-1710198281-Presentation1.png\" alt=\"\"><\/p>\n","protected":false},"template":"","class_list":["post-356515","topic","type-topic","status-closed","hentry","topic-tag-waveguide-2","topic-tag-3DFDTD-1","topic-tag-autoshotoff-2"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi everyoneI do 3D FDTD simulations and I have a problem with the simulation time. I don&#039;t know how to set the correct simulation time. The only information that I found is from the link \/forum\/forums\/topic\/how-to-estimate-the-simulation-time-for-an-fdtd-file\/In my simulation the source injects the light in a waveguide in the x direction with a total waveguide length\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-set-the-correct-simulation-time-in-3d-fdtd-simulation\/\" \/>\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=\"How to set the correct simulation time in 3D FDTD simulation? | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hi everyoneI do 3D FDTD simulations and I have a problem with the simulation time. I don&#039;t know how to set the correct simulation time. The only information that I found is from the link \/forum\/forums\/topic\/how-to-estimate-the-simulation-time-for-an-fdtd-file\/In my simulation the source injects the light in a waveguide in the x direction with a total waveguide length\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-set-the-correct-simulation-time-in-3d-fdtd-simulation\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2024\/03\/11-03-2024-1710198281-Presentation1.png\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2024\/03\/11-03-2024-1710198281-Presentation1.png\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-03-11T22:33:04+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-03-12T00:05:26+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"How to set the correct simulation time in 3D FDTD simulation? | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Hi everyoneI do 3D FDTD simulations and I have a problem with the simulation time. I don&#039;t know how to set the correct simulation time. The only information that I found is from the link \/forum\/forums\/topic\/how-to-estimate-the-simulation-time-for-an-fdtd-file\/In my simulation the source injects the light in a waveguide in the x direction with a total waveguide length\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2024\/03\/11-03-2024-1710198281-Presentation1.png\" \/>\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\\\/topic\\\/how-to-set-the-correct-simulation-time-in-3d-fdtd-simulation\\\/#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\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/3DFDTD-1\\\/#listItem\",\"name\":\"3DFDTD\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/3DFDTD-1\\\/#listItem\",\"position\":3,\"name\":\"3DFDTD\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/3DFDTD-1\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/how-to-set-the-correct-simulation-time-in-3d-fdtd-simulation\\\/#listItem\",\"name\":\"How to set the correct simulation time in 3D FDTD simulation?\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/how-to-set-the-correct-simulation-time-in-3d-fdtd-simulation\\\/#listItem\",\"position\":4,\"name\":\"How to set the correct simulation time in 3D FDTD simulation?\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/3DFDTD-1\\\/#listItem\",\"name\":\"3DFDTD\"}}]},{\"@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\\\/topic\\\/how-to-set-the-correct-simulation-time-in-3d-fdtd-simulation\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/how-to-set-the-correct-simulation-time-in-3d-fdtd-simulation\\\/\",\"name\":\"How to set the correct simulation time in 3D FDTD simulation? | Ansys Learning Forum\",\"description\":\"Hi everyoneI do 3D FDTD simulations and I have a problem with the simulation time. I don't know how to set the correct simulation time. The only information that I found is from the link \\\/forum\\\/forums\\\/topic\\\/how-to-estimate-the-simulation-time-for-an-fdtd-file\\\/In my simulation the source injects the light in a waveguide in the x direction with a total waveguide length\",\"inLanguage\":\"en-US\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/how-to-set-the-correct-simulation-time-in-3d-fdtd-simulation\\\/#breadcrumblist\"},\"datePublished\":\"2024-03-11T22:33:04+00:00\",\"dateModified\":\"2024-03-12T00:05:26+00:00\"},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"inLanguage\":\"en-US\",\"publisher\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\"}}]}\n\t\t<\/script>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"How to set the correct simulation time in 3D FDTD simulation? | Ansys Learning Forum","description":"Hi everyoneI do 3D FDTD simulations and I have a problem with the simulation time. I don't know how to set the correct simulation time. The only information that I found is from the link \/forum\/forums\/topic\/how-to-estimate-the-simulation-time-for-an-fdtd-file\/In my simulation the source injects the light in a waveguide in the x direction with a total waveguide length","canonical_url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-set-the-correct-simulation-time-in-3d-fdtd-simulation\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-set-the-correct-simulation-time-in-3d-fdtd-simulation\/#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\/topics\/#listItem","name":"Topics"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/topics\/#listItem","position":2,"name":"Topics","item":"https:\/\/innovationspace.ansys.com\/forum\/topics\/","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/3DFDTD-1\/#listItem","name":"3DFDTD"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum#listItem","name":"Home"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/3DFDTD-1\/#listItem","position":3,"name":"3DFDTD","item":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/3DFDTD-1\/","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-set-the-correct-simulation-time-in-3d-fdtd-simulation\/#listItem","name":"How to set the correct simulation time in 3D FDTD simulation?"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/topics\/#listItem","name":"Topics"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-set-the-correct-simulation-time-in-3d-fdtd-simulation\/#listItem","position":4,"name":"How to set the correct simulation time in 3D FDTD simulation?","previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/3DFDTD-1\/#listItem","name":"3DFDTD"}}]},{"@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\/topic\/how-to-set-the-correct-simulation-time-in-3d-fdtd-simulation\/#webpage","url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-set-the-correct-simulation-time-in-3d-fdtd-simulation\/","name":"How to set the correct simulation time in 3D FDTD simulation? | Ansys Learning Forum","description":"Hi everyoneI do 3D FDTD simulations and I have a problem with the simulation time. I don't know how to set the correct simulation time. The only information that I found is from the link \/forum\/forums\/topic\/how-to-estimate-the-simulation-time-for-an-fdtd-file\/In my simulation the source injects the light in a waveguide in the x direction with a total waveguide length","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#website"},"breadcrumb":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-set-the-correct-simulation-time-in-3d-fdtd-simulation\/#breadcrumblist"},"datePublished":"2024-03-11T22:33:04+00:00","dateModified":"2024-03-12T00:05:26+00:00"},{"@type":"WebSite","@id":"https:\/\/innovationspace.ansys.com\/forum\/#website","url":"https:\/\/innovationspace.ansys.com\/forum\/","name":"Ansys Learning Forum","description":"Ansys Innovation Space","inLanguage":"en-US","publisher":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#organization"}}]},"og:locale":"en_US","og:site_name":"Ansys Learning Forum | Ansys Innovation Space","og:type":"article","og:title":"How to set the correct simulation time in 3D FDTD simulation? | Ansys Learning Forum","og:description":"Hi everyoneI do 3D FDTD simulations and I have a problem with the simulation time. I don't know how to set the correct simulation time. The only information that I found is from the link \/forum\/forums\/topic\/how-to-estimate-the-simulation-time-for-an-fdtd-file\/In my simulation the source injects the light in a waveguide in the x direction with a total waveguide length","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-set-the-correct-simulation-time-in-3d-fdtd-simulation\/","og:image":"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2024\/03\/11-03-2024-1710198281-Presentation1.png","og:image:secure_url":"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2024\/03\/11-03-2024-1710198281-Presentation1.png","article:published_time":"2024-03-11T22:33:04+00:00","article:modified_time":"2024-03-12T00:05:26+00:00","twitter:card":"summary_large_image","twitter:title":"How to set the correct simulation time in 3D FDTD simulation? | Ansys Learning Forum","twitter:description":"Hi everyoneI do 3D FDTD simulations and I have a problem with the simulation time. I don't know how to set the correct simulation time. The only information that I found is from the link \/forum\/forums\/topic\/how-to-estimate-the-simulation-time-for-an-fdtd-file\/In my simulation the source injects the light in a waveguide in the x direction with a total waveguide length","twitter:image":"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2024\/03\/11-03-2024-1710198281-Presentation1.png"},"aioseo_meta_data":{"post_id":"356515","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"content","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":true,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":"default","schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"limit_modified_date":false,"created":"2024-10-28 16:54:47","updated":"2024-10-28 16:54:47","ai":null,"breadcrumb_settings":null,"seo_analyzer_scan_date":null},"aioseo_breadcrumb":"<div class=\"aioseo-breadcrumbs\"><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\" title=\"Home\">Home<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\/topics\/\" title=\"Topics\">Topics<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/3DFDTD-1\/\" title=\"3DFDTD\">3DFDTD<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tHow to set the correct simulation time in 3D FDTD simulation?\n\t\t<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/innovationspace.ansys.com\/forum"},{"label":"Topics","link":"https:\/\/innovationspace.ansys.com\/forum\/topics\/"},{"label":"3DFDTD","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/3DFDTD-1\/"},{"label":"How to set the correct simulation time in 3D FDTD simulation?","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-set-the-correct-simulation-time-in-3d-fdtd-simulation\/"}],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["188788","33648"],"_bbp_author_ip":["23.52.43.16"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["1011"],"_bbp_topic_status":["unanswered"],"_edit_lock":["1710198247:74286"],"_bbp_topic_id":["356515"],"_bbp_forum_id":["27833"],"_bbp_engagement":["33648","188788"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["1"],"_bbp_last_reply_id":["356521"],"_bbp_last_active_id":["356521"],"_bbp_last_active_time":["2024-03-12 00:03:50"]},"test":"konstalekk"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/356515","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":2,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/356515\/revisions"}],"predecessor-version":[{"id":356519,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/356515\/revisions\/356519"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=356515"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}