{"id":381307,"date":"2024-09-02T07:45:41","date_gmt":"2024-09-02T07:45:41","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-use-initial-guess-in-topology-optimization\/"},"modified":"2024-09-02T07:45:41","modified_gmt":"2024-09-02T07:45:41","slug":"how-to-use-initial-guess-in-topology-optimization","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-use-initial-guess-in-topology-optimization\/","title":{"rendered":"How to use &#8221;initial guess&#8221; in topology optimization?"},"content":{"rendered":"<p>&lt;p&gt;Hi !&lt;\/p&gt;&lt;p&gt;In topology optimization, it&#8217;s possible to use a custom geometric structure as the initial design. I referred to the settings in the cases &#8220;y_splitter_topology&#8221; and &#8220;CWDM_splitter_1310_4ch_2D_TE_topology&#8221;:&lt;\/p&gt;<\/p>\n<ul>\n<li>Placed the custom initial structure in the &#8220;initial_guess&#8221; structure group.<\/li>\n<li>Set the <code>params<\/code> parameter of the geometry to <code>None<\/code>.<\/li>\n<\/ul>\n<p>&lt;p&gt;However, when running the simulation, I encountered the following error:&lt;\/p&gt;&lt;p&gt;UserWarning: Project file structure &#8216;initial_guess&#8217; reports 1 parameter where expected 5929. This can occur when the number of x, y coordinates specified to LumOpt do not match the dimensions of the FDTD grid. Try using similar or divisible delta values (size of a pixel) across all the axes.&lt;\/p&gt;&lt;p&gt;In my FDTD settings, <code>mesh accuracy = 3<\/code>, and no additional mesh was added to the optimization region. It seems to match the settings in the examples, but I can&#8217;t figure out why the error occurs. Are there any other details that I might have overlooked?&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-381307","topic","type-topic","status-publish","hentry","topic-tag-inverse-design-2","topic-tag-lumopt-1","topic-tag-topology-optimization"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi !In topology optimization, it&#039;s possible to use a custom geometric structure as the initial design. I referred to the settings in the cases &quot;y_splitter_topology&quot; and &quot;CWDM_splitter_1310_4ch_2D_TE_topology&quot;:Placed the custom initial structure in the &quot;initial_guess&quot; structure group.Set the params parameter of the geometry to None.However, when running the simulation, I encountered the following error:UserWarning: Project file\" \/>\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-use-initial-guess-in-topology-optimization\/\" \/>\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 use \u201dinitial guess\u201d in topology optimization? | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hi !In topology optimization, it&#039;s possible to use a custom geometric structure as the initial design. I referred to the settings in the cases &quot;y_splitter_topology&quot; and &quot;CWDM_splitter_1310_4ch_2D_TE_topology&quot;:Placed the custom initial structure in the &quot;initial_guess&quot; structure group.Set the params parameter of the geometry to None.However, when running the simulation, I encountered the following error:UserWarning: Project file\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-use-initial-guess-in-topology-optimization\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-09-02T07:45:41+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-09-02T07:45:41+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"How to use \u201dinitial guess\u201d in topology optimization? | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Hi !In topology optimization, it&#039;s possible to use a custom geometric structure as the initial design. I referred to the settings in the cases &quot;y_splitter_topology&quot; and &quot;CWDM_splitter_1310_4ch_2D_TE_topology&quot;:Placed the custom initial structure in the &quot;initial_guess&quot; structure group.Set the params parameter of the geometry to None.However, when running the simulation, I encountered the following error:UserWarning: Project file\" \/>\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-use-initial-guess-in-topology-optimization\\\/#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\\\/topology-optimization\\\/#listItem\",\"name\":\"topology-optimization\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/topology-optimization\\\/#listItem\",\"position\":3,\"name\":\"topology-optimization\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/topology-optimization\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/how-to-use-initial-guess-in-topology-optimization\\\/#listItem\",\"name\":\"How to use &#8221;initial guess&#8221; in topology optimization?\"},\"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-use-initial-guess-in-topology-optimization\\\/#listItem\",\"position\":4,\"name\":\"How to use &#8221;initial guess&#8221; in topology optimization?\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/topology-optimization\\\/#listItem\",\"name\":\"topology-optimization\"}}]},{\"@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-use-initial-guess-in-topology-optimization\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/how-to-use-initial-guess-in-topology-optimization\\\/\",\"name\":\"How to use \\u201dinitial guess\\u201d in topology optimization? | Ansys Learning Forum\",\"description\":\"Hi !In topology optimization, it's possible to use a custom geometric structure as the initial design. I referred to the settings in the cases \\\"y_splitter_topology\\\" and \\\"CWDM_splitter_1310_4ch_2D_TE_topology\\\":Placed the custom initial structure in the \\\"initial_guess\\\" structure group.Set the params parameter of the geometry to None.However, when running the simulation, I encountered the following error:UserWarning: Project file\",\"inLanguage\":\"en-US\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/how-to-use-initial-guess-in-topology-optimization\\\/#breadcrumblist\"},\"datePublished\":\"2024-09-02T07:45:41+00:00\",\"dateModified\":\"2024-09-02T07:45:41+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 use \u201dinitial guess\u201d in topology optimization? | Ansys Learning Forum","description":"Hi !In topology optimization, it's possible to use a custom geometric structure as the initial design. I referred to the settings in the cases \"y_splitter_topology\" and \"CWDM_splitter_1310_4ch_2D_TE_topology\":Placed the custom initial structure in the \"initial_guess\" structure group.Set the params parameter of the geometry to None.However, when running the simulation, I encountered the following error:UserWarning: Project file","canonical_url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-use-initial-guess-in-topology-optimization\/","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-use-initial-guess-in-topology-optimization\/#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\/topology-optimization\/#listItem","name":"topology-optimization"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum#listItem","name":"Home"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/topology-optimization\/#listItem","position":3,"name":"topology-optimization","item":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/topology-optimization\/","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-use-initial-guess-in-topology-optimization\/#listItem","name":"How to use &#8221;initial guess&#8221; in topology optimization?"},"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-use-initial-guess-in-topology-optimization\/#listItem","position":4,"name":"How to use &#8221;initial guess&#8221; in topology optimization?","previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/topology-optimization\/#listItem","name":"topology-optimization"}}]},{"@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-use-initial-guess-in-topology-optimization\/#webpage","url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-use-initial-guess-in-topology-optimization\/","name":"How to use \u201dinitial guess\u201d in topology optimization? | Ansys Learning Forum","description":"Hi !In topology optimization, it's possible to use a custom geometric structure as the initial design. I referred to the settings in the cases \"y_splitter_topology\" and \"CWDM_splitter_1310_4ch_2D_TE_topology\":Placed the custom initial structure in the \"initial_guess\" structure group.Set the params parameter of the geometry to None.However, when running the simulation, I encountered the following error:UserWarning: Project file","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#website"},"breadcrumb":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-use-initial-guess-in-topology-optimization\/#breadcrumblist"},"datePublished":"2024-09-02T07:45:41+00:00","dateModified":"2024-09-02T07:45:41+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 use \u201dinitial guess\u201d in topology optimization? | Ansys Learning Forum","og:description":"Hi !In topology optimization, it's possible to use a custom geometric structure as the initial design. I referred to the settings in the cases &quot;y_splitter_topology&quot; and &quot;CWDM_splitter_1310_4ch_2D_TE_topology&quot;:Placed the custom initial structure in the &quot;initial_guess&quot; structure group.Set the params parameter of the geometry to None.However, when running the simulation, I encountered the following error:UserWarning: Project file","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-use-initial-guess-in-topology-optimization\/","article:published_time":"2024-09-02T07:45:41+00:00","article:modified_time":"2024-09-02T07:45:41+00:00","twitter:card":"summary_large_image","twitter:title":"How to use \u201dinitial guess\u201d in topology optimization? | Ansys Learning Forum","twitter:description":"Hi !In topology optimization, it's possible to use a custom geometric structure as the initial design. I referred to the settings in the cases &quot;y_splitter_topology&quot; and &quot;CWDM_splitter_1310_4ch_2D_TE_topology&quot;:Placed the custom initial structure in the &quot;initial_guess&quot; structure group.Set the params parameter of the geometry to None.However, when running the simulation, I encountered the following error:UserWarning: Project file"},"aioseo_meta_data":{"post_id":"381307","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 16:30:33","updated":"2026-09-16 23:04:37","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\/topology-optimization\/\" title=\"topology-optimization\">topology-optimization<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tHow to use \u201dinitial guess\u201d in topology optimization?\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":"topology-optimization","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/topology-optimization\/"},{"label":"How to use &#8221;initial guess&#8221; in topology optimization?","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-use-initial-guess-in-topology-optimization\/"}],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":["194.99.79.6"],"_btv_view_count":["530"],"_bbp_topic_status":["unanswered"],"_bbp_subscription":["50911","343266","296562"],"_bbp_topic_id":["381307"],"_bbp_forum_id":["27833"],"_bbp_engagement":["50911","343266","296562"],"_bbp_voice_count":["3"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["449462"],"_bbp_last_active_id":["449462"],"_bbp_last_active_time":["2025-12-31 09:57:05"]},"test":"2200453024email-szu-edu-cn"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/381307","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\/381307\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=381307"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}