{"id":166077,"date":"2023-03-17T13:10:58","date_gmt":"2023-03-17T13:10:58","guid":{"rendered":"\/knowledge\/forums\/topic\/how-can-i-converge-an-unstable-fsi-or-6dof-case-in-fluent\/"},"modified":"2023-07-31T12:27:16","modified_gmt":"2023-07-31T12:27:16","slug":"how-can-i-converge-an-unstable-fsi-or-6dof-case-in-fluent","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-can-i-converge-an-unstable-fsi-or-6dof-case-in-fluent\/","title":{"rendered":"How can I converge an unstable FSI or 6DOF case in Fluent"},"content":{"rendered":"<p>The attached presentation describes how to use Fluent&#8217;s Solution Stabilization for an FSI case or a 6DOF case. Two simple tutorials are included: One for FSI and one for 6DOF. Animations reffered to in the pdf are also included  Keywords Tightly coupled FSI &#038; 6DOF Pressure oscillations Force convergence Negative cell volume Dynamic Mesh MDM Smoothing remeshing Implicit Update System Coupling Coupling step Coupling iteration <\/p>\n<p>Attachments:<br \/>\n1. <a href=https:\/\/ansys13.ansys.com\/KnowledgeArticles\/Phase-1\/2039459\/2039459.zip>2039459.zip<\/a><br \/>\n2. <a href= https:\/\/ansys13.ansys.com\/KnowledgeArticles\/Phase-1\/2039459\/Solution_stabilization_For_FSI_%26_6DOF.pdf>Solution_stabilization_For_FSI_%26_6DOF.pdf<\/a><\/p>\n","protected":false},"template":"","class_list":["post-166077","topic","type-topic","status-publish","hentry","topic-tag-4425","topic-tag-convergence-problems","topic-tag-fluent","topic-tag-fluid-dynamics","topic-tag-fsi"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"The attached presentation describes how to use Fluent&#039;s Solution Stabilization for an FSI case or a 6DOF case. Two simple tutorials are included: One for FSI and one for 6DOF. Animations reffered to in the pdf are also included Keywords Tightly coupled FSI &amp; 6DOF Pressure oscillations Force convergence Negative cell volume Dynamic Mesh MDM\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-can-i-converge-an-unstable-fsi-or-6dof-case-in-fluent\/\" \/>\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 Knowledge | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"How can I converge an unstable FSI or 6DOF case in Fluent | Ansys Knowledge\" \/>\n\t\t<meta property=\"og:description\" content=\"The attached presentation describes how to use Fluent&#039;s Solution Stabilization for an FSI case or a 6DOF case. Two simple tutorials are included: One for FSI and one for 6DOF. Animations reffered to in the pdf are also included Keywords Tightly coupled FSI &amp; 6DOF Pressure oscillations Force convergence Negative cell volume Dynamic Mesh MDM\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-can-i-converge-an-unstable-fsi-or-6dof-case-in-fluent\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2023-03-17T13:10:58+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2023-07-31T12:27:16+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"How can I converge an unstable FSI or 6DOF case in Fluent | Ansys Knowledge\" \/>\n\t\t<meta name=\"twitter:description\" content=\"The attached presentation describes how to use Fluent&#039;s Solution Stabilization for an FSI case or a 6DOF case. Two simple tutorials are included: One for FSI and one for 6DOF. Animations reffered to in the pdf are also included Keywords Tightly coupled FSI &amp; 6DOF Pressure oscillations Force convergence Negative cell volume Dynamic Mesh MDM\" \/>\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\\\/knowledge\\\/forums\\\/topic\\\/how-can-i-converge-an-unstable-fsi-or-6dof-case-in-fluent\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/fluent\\\/#listItem\",\"name\":\"fluent\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/fluent\\\/#listItem\",\"position\":3,\"name\":\"fluent\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/fluent\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/how-can-i-converge-an-unstable-fsi-or-6dof-case-in-fluent\\\/#listItem\",\"name\":\"How can I converge an unstable FSI or 6DOF case in Fluent\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/how-can-i-converge-an-unstable-fsi-or-6dof-case-in-fluent\\\/#listItem\",\"position\":4,\"name\":\"How can I converge an unstable FSI or 6DOF case in Fluent\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/fluent\\\/#listItem\",\"name\":\"fluent\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/#organization\",\"name\":\"Ansys Knowledge\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/how-can-i-converge-an-unstable-fsi-or-6dof-case-in-fluent\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/how-can-i-converge-an-unstable-fsi-or-6dof-case-in-fluent\\\/\",\"name\":\"How can I converge an unstable FSI or 6DOF case in Fluent | Ansys Knowledge\",\"description\":\"The attached presentation describes how to use Fluent's Solution Stabilization for an FSI case or a 6DOF case. Two simple tutorials are included: One for FSI and one for 6DOF. Animations reffered to in the pdf are also included Keywords Tightly coupled FSI & 6DOF Pressure oscillations Force convergence Negative cell volume Dynamic Mesh MDM\",\"inLanguage\":\"en-US\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/#website\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/how-can-i-converge-an-unstable-fsi-or-6dof-case-in-fluent\\\/#breadcrumblist\"},\"datePublished\":\"2023-03-17T13:10:58+00:00\",\"dateModified\":\"2023-07-31T12:27:16+00:00\"},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/#website\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/\",\"name\":\"Ansys Knowledge\",\"description\":\"Ansys Innovation Space\",\"inLanguage\":\"en-US\",\"publisher\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/#organization\"}}]}\n\t\t<\/script>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"How can I converge an unstable FSI or 6DOF case in Fluent | Ansys Knowledge","description":"The attached presentation describes how to use Fluent's Solution Stabilization for an FSI case or a 6DOF case. Two simple tutorials are included: One for FSI and one for 6DOF. Animations reffered to in the pdf are also included Keywords Tightly coupled FSI & 6DOF Pressure oscillations Force convergence Negative cell volume Dynamic Mesh MDM","canonical_url":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-can-i-converge-an-unstable-fsi-or-6dof-case-in-fluent\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-can-i-converge-an-unstable-fsi-or-6dof-case-in-fluent\/#breadcrumblist","itemListElement":[{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge#listItem","position":1,"name":"Home","item":"https:\/\/innovationspace.ansys.com\/knowledge","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/#listItem","name":"Topics"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/#listItem","position":2,"name":"Topics","item":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/fluent\/#listItem","name":"fluent"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge#listItem","name":"Home"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/fluent\/#listItem","position":3,"name":"fluent","item":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/fluent\/","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-can-i-converge-an-unstable-fsi-or-6dof-case-in-fluent\/#listItem","name":"How can I converge an unstable FSI or 6DOF case in Fluent"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/#listItem","name":"Topics"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-can-i-converge-an-unstable-fsi-or-6dof-case-in-fluent\/#listItem","position":4,"name":"How can I converge an unstable FSI or 6DOF case in Fluent","previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/fluent\/#listItem","name":"fluent"}}]},{"@type":"Organization","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/#organization","name":"Ansys Knowledge","description":"Ansys Innovation Space","url":"https:\/\/innovationspace.ansys.com\/knowledge\/"},{"@type":"WebPage","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-can-i-converge-an-unstable-fsi-or-6dof-case-in-fluent\/#webpage","url":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-can-i-converge-an-unstable-fsi-or-6dof-case-in-fluent\/","name":"How can I converge an unstable FSI or 6DOF case in Fluent | Ansys Knowledge","description":"The attached presentation describes how to use Fluent's Solution Stabilization for an FSI case or a 6DOF case. Two simple tutorials are included: One for FSI and one for 6DOF. Animations reffered to in the pdf are also included Keywords Tightly coupled FSI & 6DOF Pressure oscillations Force convergence Negative cell volume Dynamic Mesh MDM","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/innovationspace.ansys.com\/knowledge\/#website"},"breadcrumb":{"@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-can-i-converge-an-unstable-fsi-or-6dof-case-in-fluent\/#breadcrumblist"},"datePublished":"2023-03-17T13:10:58+00:00","dateModified":"2023-07-31T12:27:16+00:00"},{"@type":"WebSite","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/#website","url":"https:\/\/innovationspace.ansys.com\/knowledge\/","name":"Ansys Knowledge","description":"Ansys Innovation Space","inLanguage":"en-US","publisher":{"@id":"https:\/\/innovationspace.ansys.com\/knowledge\/#organization"}}]},"og:locale":"en_US","og:site_name":"Ansys Knowledge | Ansys Innovation Space","og:type":"article","og:title":"How can I converge an unstable FSI or 6DOF case in Fluent | Ansys Knowledge","og:description":"The attached presentation describes how to use Fluent's Solution Stabilization for an FSI case or a 6DOF case. Two simple tutorials are included: One for FSI and one for 6DOF. Animations reffered to in the pdf are also included Keywords Tightly coupled FSI &amp; 6DOF Pressure oscillations Force convergence Negative cell volume Dynamic Mesh MDM","og:url":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-can-i-converge-an-unstable-fsi-or-6dof-case-in-fluent\/","article:published_time":"2023-03-17T13:10:58+00:00","article:modified_time":"2023-07-31T12:27:16+00:00","twitter:card":"summary_large_image","twitter:title":"How can I converge an unstable FSI or 6DOF case in Fluent | Ansys Knowledge","twitter:description":"The attached presentation describes how to use Fluent's Solution Stabilization for an FSI case or a 6DOF case. Two simple tutorials are included: One for FSI and one for 6DOF. Animations reffered to in the pdf are also included Keywords Tightly coupled FSI &amp; 6DOF Pressure oscillations Force convergence Negative cell volume Dynamic Mesh MDM"},"aioseo_meta_data":{"post_id":"166077","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":"default","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":false,"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":"2025-10-17 22:44:29","updated":"2026-07-30 13:12:44","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\/knowledge\" 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\/knowledge\/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\/knowledge\/forums\/topic-tag\/fluent\/\" title=\"fluent\">fluent<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tHow can I converge an unstable FSI or 6DOF case in Fluent\n\t\t<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/innovationspace.ansys.com\/knowledge"},{"label":"Topics","link":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/"},{"label":"fluent","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/fluent\/"},{"label":"How can I converge an unstable FSI or 6DOF case in Fluent","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-can-i-converge-an-unstable-fsi-or-6dof-case-in-fluent\/"}],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_last_active_time":["3-15-2023  20:20:13"],"_bbp_forum_id":["27796"],"_bbp_author_ip":["23.56.168.180"],"_btv_view_count":["1892"],"siebel_km_number":["2039459"],"product_version":["15"],"km_published_date":["2015-06-12T17:08:40.000Z"],"family":["Fluid Dynamics"],"application_name":["FLUENT"]},"test":"solution"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/166077","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/166077\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=166077"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}