{"id":369213,"date":"2024-05-30T11:38:16","date_gmt":"2024-05-30T11:38:16","guid":{"rendered":"\/forum\/forums\/reply\/369213\/"},"modified":"2024-05-30T11:39:29","modified_gmt":"2024-05-30T11:39:29","slug":"369213","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/369213\/","title":{"rendered":"Reply To: MODE: Strange mode result from FDE solver"},"content":{"rendered":"<p>&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p class=&#8221;&rdquo;MsoNormal&rdquo;&#8221;&gt;Hello Amrita,&lt;br&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;EN-US&rdquo;&#8221;&gt;thank you for this suggestion. I tried it and unfortunately this strange behaviour occurs also for large simulation spans randomly, i.e. sometimes I get a physical result sometimes not. Independent of the parameter settings. &lt;\/span&gt;&lt;br&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;EN-US&rdquo;&#8221;&gt;For instance, here I used a quite large solver area with yspan = 9.6 microns and zspan = 4.8 microns for a (bent) waveguide of width = 800nm, height = 600nm and bent radius of 100 micron. The default mesh has a max. stepsize of 20nm. Around the waveguide I used an override mesh with a max. step size of 5nm.&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;&rdquo;MsoNormal&rdquo;&#8221;&gt;<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/30-05-2024-1717068856-result_largerSimulationSpan.PNG\" alt=\"\" width=\"1204\" height=\"577\" \/>&lt;\/p&gt;&lt;p class=&#8221;&rdquo;MsoNormal&rdquo;&#8221;&gt;&lt;span lang=&#8221;&rdquo;EN-US&rdquo;&#8221;&gt;Without changing anything &ndash; just re-running the exact same simulation as above &ndash; I can also obtain this (correct) result:&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;&rdquo;MsoNormal&rdquo;&#8221;&gt;<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/30-05-2024-1717068906-result_largerSimulationSpan_correct.PNG\" alt=\"\" width=\"1205\" height=\"578\" \/>&lt;br&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;EN-US&rdquo;&#8221;&gt;So, doing a parameter sweep is possible, but not helpful as these unphysical results happen randomly and are just outliers of an otherwise converging curve.&lt;\/span&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;EN-US&rdquo;&#8221;&gt;I am running this simulation on a computational server of my university.&nbsp;&lt;\/span&gt;&lt;span lang=&#8221;&rdquo;EN-US&rdquo;&#8221;&gt;I was wondering if this behaviour could be caused by the computational resource&lt;\/span&gt;&lt;span lang=&#8221;&rdquo;EN-US&rdquo;&#8221;&gt; management of Lumerical and the server.&nbsp;&lt;\/span&gt;&lt;br&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;EN-US&rdquo;&#8221;&gt;Best regards,&lt;\/span&gt;&lt;br&gt;&lt;span lang=&#8221;&rdquo;EN-US&rdquo;&#8221;&gt;Henrick&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-369213","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=\"Hello Amrita,thank you for this suggestion. I tried it and unfortunately this strange behaviour occurs also for large simulation spans randomly, i.e. sometimes I get a physical result sometimes not. Independent of the parameter settings. For instance, here I used a quite large solver area with yspan = 9.6 microns and zspan\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/369213\/\" \/>\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: MODE: Strange mode result from FDE solver | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hello Amrita,thank you for this suggestion. I tried it and unfortunately this strange behaviour occurs also for large simulation spans randomly, i.e. sometimes I get a physical result sometimes not. Independent of the parameter settings. For instance, here I used a quite large solver area with yspan = 9.6 microns and zspan\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/369213\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/30-05-2024-1717068856-result_largerSimulationSpan.PNG\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/30-05-2024-1717068856-result_largerSimulationSpan.PNG\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-05-30T11:38:16+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-05-30T11:39:29+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: MODE: Strange mode result from FDE solver | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Hello Amrita,thank you for this suggestion. I tried it and unfortunately this strange behaviour occurs also for large simulation spans randomly, i.e. sometimes I get a physical result sometimes not. Independent of the parameter settings. For instance, here I used a quite large solver area with yspan = 9.6 microns and zspan\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/30-05-2024-1717068856-result_largerSimulationSpan.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\\\/reply\\\/369213\\\/#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\\\/369213\\\/#listItem\",\"name\":\"Reply To: MODE: Strange mode result from FDE solver\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/369213\\\/#listItem\",\"position\":2,\"name\":\"Reply To: MODE: Strange mode result from FDE 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\\\/369213\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/369213\\\/\",\"name\":\"Reply To: MODE: Strange mode result from FDE solver | Ansys Learning Forum\",\"description\":\"Hello Amrita,thank you for this suggestion. I tried it and unfortunately this strange behaviour occurs also for large simulation spans randomly, i.e. sometimes I get a physical result sometimes not. Independent of the parameter settings. For instance, here I used a quite large solver area with yspan = 9.6 microns and zspan\",\"inLanguage\":\"en-US\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/369213\\\/#breadcrumblist\"},\"datePublished\":\"2024-05-30T11:38:16+00:00\",\"dateModified\":\"2024-05-30T11:39:29+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":"Reply To: MODE: Strange mode result from FDE solver | Ansys Learning Forum","description":"Hello Amrita,thank you for this suggestion. I tried it and unfortunately this strange behaviour occurs also for large simulation spans randomly, i.e. sometimes I get a physical result sometimes not. Independent of the parameter settings. For instance, here I used a quite large solver area with yspan = 9.6 microns and zspan","canonical_url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/369213\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/369213\/#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\/369213\/#listItem","name":"Reply To: MODE: Strange mode result from FDE solver"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/369213\/#listItem","position":2,"name":"Reply To: MODE: Strange mode result from FDE 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\/369213\/#webpage","url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/369213\/","name":"Reply To: MODE: Strange mode result from FDE solver | Ansys Learning Forum","description":"Hello Amrita,thank you for this suggestion. I tried it and unfortunately this strange behaviour occurs also for large simulation spans randomly, i.e. sometimes I get a physical result sometimes not. Independent of the parameter settings. For instance, here I used a quite large solver area with yspan = 9.6 microns and zspan","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#website"},"breadcrumb":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/369213\/#breadcrumblist"},"datePublished":"2024-05-30T11:38:16+00:00","dateModified":"2024-05-30T11:39:29+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":"Reply To: MODE: Strange mode result from FDE solver | Ansys Learning Forum","og:description":"Hello Amrita,thank you for this suggestion. I tried it and unfortunately this strange behaviour occurs also for large simulation spans randomly, i.e. sometimes I get a physical result sometimes not. Independent of the parameter settings. For instance, here I used a quite large solver area with yspan = 9.6 microns and zspan","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/369213\/","og:image":"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/30-05-2024-1717068856-result_largerSimulationSpan.PNG","og:image:secure_url":"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/30-05-2024-1717068856-result_largerSimulationSpan.PNG","article:published_time":"2024-05-30T11:38:16+00:00","article:modified_time":"2024-05-30T11:39:29+00:00","twitter:card":"summary_large_image","twitter:title":"Reply To: MODE: Strange mode result from FDE solver | Ansys Learning Forum","twitter:description":"Hello Amrita,thank you for this suggestion. I tried it and unfortunately this strange behaviour occurs also for large simulation spans randomly, i.e. sometimes I get a physical result sometimes not. Independent of the parameter settings. For instance, here I used a quite large solver area with yspan = 9.6 microns and zspan","twitter:image":"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/30-05-2024-1717068856-result_largerSimulationSpan.PNG"},"aioseo_meta_data":{"post_id":"369213","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 16:40:08","updated":"2024-10-28 16:40:09","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\tReply To: MODE: Strange mode result from FDE solver\n\t\t<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/innovationspace.ansys.com\/forum"},{"label":"Reply To: MODE: Strange mode result from FDE solver","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/369213\/"}],"acf":[],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/369213","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/reply"}],"version-history":[{"count":1,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/369213\/revisions"}],"predecessor-version":[{"id":369215,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/369213\/revisions\/369215"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=369213"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}