{"id":403171,"date":"2025-01-01T23:03:17","date_gmt":"2025-01-01T23:03:17","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/two-way-fsi-excessive-thickness-change\/"},"modified":"2025-01-01T23:03:17","modified_gmt":"2025-01-01T23:03:17","slug":"two-way-fsi-excessive-thickness-change","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/two-way-fsi-excessive-thickness-change\/","title":{"rendered":"Two-way FSI: excessive thickness change"},"content":{"rendered":"<p>&lt;p&gt;I&#8217;m setting up a two-way FSI simulation, but it keeps crashing due to excessive thickness change errors in ANSYS. The CFD part (Fluent) works perfectly, but the issue arises when coupling it for FSI.&lt;\/p&gt;&lt;p&gt;I&rsquo;ve used wall properties with a density of 1000, a Young&rsquo;s modulus of 2 MPa, and a Poisson&rsquo;s ratio of 0.49 (these are rough estimates). Despite this, my model keeps crashing. The only time I managed to get the two-way FSI to run was &lt;span style=&#8221;color: #ba372a;&#8221;&gt;<strong>when I used wall properties resembling structural steel,<\/strong>&lt;\/span&gt; which isn&rsquo;t physiologically appropriate for this scenario. (fluid is Blood)&lt;\/p&gt;&lt;p&gt;Do you have any insights or suggestions?&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-403171","topic","type-topic","status-publish","hentry","topic-tag-excessive-distortion-1","topic-tag-fsi-2-way-1","topic-tag-two-way-fsi-1"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I&#039;m setting up a two-way FSI simulation, but it keeps crashing due to excessive thickness change errors in ANSYS. The CFD part (Fluent) works perfectly, but the issue arises when coupling it for FSI.I\u2019ve used wall properties with a density of 1000, a Young\u2019s modulus of 2 MPa, and a Poisson\u2019s ratio of 0.49 (these\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/two-way-fsi-excessive-thickness-change\/\" \/>\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=\"Two-way FSI: excessive thickness change | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"I&#039;m setting up a two-way FSI simulation, but it keeps crashing due to excessive thickness change errors in ANSYS. The CFD part (Fluent) works perfectly, but the issue arises when coupling it for FSI.I\u2019ve used wall properties with a density of 1000, a Young\u2019s modulus of 2 MPa, and a Poisson\u2019s ratio of 0.49 (these\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/two-way-fsi-excessive-thickness-change\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2025-01-01T23:03:17+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2025-01-01T23:03:17+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Two-way FSI: excessive thickness change | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"I&#039;m setting up a two-way FSI simulation, but it keeps crashing due to excessive thickness change errors in ANSYS. The CFD part (Fluent) works perfectly, but the issue arises when coupling it for FSI.I\u2019ve used wall properties with a density of 1000, a Young\u2019s modulus of 2 MPa, and a Poisson\u2019s ratio of 0.49 (these\" \/>\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\\\/two-way-fsi-excessive-thickness-change\\\/#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\\\/fsi-2-way-1\\\/#listItem\",\"name\":\"fsi-2-way\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/fsi-2-way-1\\\/#listItem\",\"position\":3,\"name\":\"fsi-2-way\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/fsi-2-way-1\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/two-way-fsi-excessive-thickness-change\\\/#listItem\",\"name\":\"Two-way FSI: excessive thickness change\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/two-way-fsi-excessive-thickness-change\\\/#listItem\",\"position\":4,\"name\":\"Two-way FSI: excessive thickness change\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/fsi-2-way-1\\\/#listItem\",\"name\":\"fsi-2-way\"}}]},{\"@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\\\/two-way-fsi-excessive-thickness-change\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/two-way-fsi-excessive-thickness-change\\\/\",\"name\":\"Two-way FSI: excessive thickness change | Ansys Learning Forum\",\"description\":\"I'm setting up a two-way FSI simulation, but it keeps crashing due to excessive thickness change errors in ANSYS. The CFD part (Fluent) works perfectly, but the issue arises when coupling it for FSI.I\\u2019ve used wall properties with a density of 1000, a Young\\u2019s modulus of 2 MPa, and a Poisson\\u2019s ratio of 0.49 (these\",\"inLanguage\":\"en-US\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/two-way-fsi-excessive-thickness-change\\\/#breadcrumblist\"},\"datePublished\":\"2025-01-01T23:03:17+00:00\",\"dateModified\":\"2025-01-01T23:03:17+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":"Two-way FSI: excessive thickness change | Ansys Learning Forum","description":"I'm setting up a two-way FSI simulation, but it keeps crashing due to excessive thickness change errors in ANSYS. The CFD part (Fluent) works perfectly, but the issue arises when coupling it for FSI.I\u2019ve used wall properties with a density of 1000, a Young\u2019s modulus of 2 MPa, and a Poisson\u2019s ratio of 0.49 (these","canonical_url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/two-way-fsi-excessive-thickness-change\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/two-way-fsi-excessive-thickness-change\/#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\/fsi-2-way-1\/#listItem","name":"fsi-2-way"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum#listItem","name":"Home"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/fsi-2-way-1\/#listItem","position":3,"name":"fsi-2-way","item":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/fsi-2-way-1\/","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/two-way-fsi-excessive-thickness-change\/#listItem","name":"Two-way FSI: excessive thickness change"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/topics\/#listItem","name":"Topics"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/two-way-fsi-excessive-thickness-change\/#listItem","position":4,"name":"Two-way FSI: excessive thickness change","previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/fsi-2-way-1\/#listItem","name":"fsi-2-way"}}]},{"@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\/two-way-fsi-excessive-thickness-change\/#webpage","url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/two-way-fsi-excessive-thickness-change\/","name":"Two-way FSI: excessive thickness change | Ansys Learning Forum","description":"I'm setting up a two-way FSI simulation, but it keeps crashing due to excessive thickness change errors in ANSYS. The CFD part (Fluent) works perfectly, but the issue arises when coupling it for FSI.I\u2019ve used wall properties with a density of 1000, a Young\u2019s modulus of 2 MPa, and a Poisson\u2019s ratio of 0.49 (these","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#website"},"breadcrumb":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/two-way-fsi-excessive-thickness-change\/#breadcrumblist"},"datePublished":"2025-01-01T23:03:17+00:00","dateModified":"2025-01-01T23:03:17+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":"Two-way FSI: excessive thickness change | Ansys Learning Forum","og:description":"I'm setting up a two-way FSI simulation, but it keeps crashing due to excessive thickness change errors in ANSYS. The CFD part (Fluent) works perfectly, but the issue arises when coupling it for FSI.I\u2019ve used wall properties with a density of 1000, a Young\u2019s modulus of 2 MPa, and a Poisson\u2019s ratio of 0.49 (these","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/two-way-fsi-excessive-thickness-change\/","article:published_time":"2025-01-01T23:03:17+00:00","article:modified_time":"2025-01-01T23:03:17+00:00","twitter:card":"summary_large_image","twitter:title":"Two-way FSI: excessive thickness change | Ansys Learning Forum","twitter:description":"I'm setting up a two-way FSI simulation, but it keeps crashing due to excessive thickness change errors in ANSYS. The CFD part (Fluent) works perfectly, but the issue arises when coupling it for FSI.I\u2019ve used wall properties with a density of 1000, a Young\u2019s modulus of 2 MPa, and a Poisson\u2019s ratio of 0.49 (these"},"aioseo_meta_data":{"post_id":"403171","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":"2025-10-19 10:50:48","updated":"2026-09-17 15:10:07","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\/fsi-2-way-1\/\" title=\"fsi-2-way\">fsi-2-way<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tTwo-way FSI: excessive thickness change\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":"fsi-2-way","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/fsi-2-way-1\/"},{"label":"Two-way FSI: excessive thickness change","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/two-way-fsi-excessive-thickness-change\/"}],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["403171"],"_bbp_subscription":["431728","805","581625"],"_bbp_author_ip":["130.215.190.183"],"_bbp_last_reply_id":["438595"],"_bbp_last_active_id":["438595"],"_bbp_last_active_time":["2025-08-05 07:58:20"],"_bbp_reply_count":["10"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["3"],"_bbp_engagement":["431728","805","581625"],"_btv_view_count":["389"],"_bbp_topic_status":["unanswered"]},"test":"751ef47ef94a7db2035eda1dd10abecb4b252174"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/403171","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\/403171\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=403171"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}