{"id":397315,"date":"2024-12-12T18:01:56","date_gmt":"2024-12-12T18:01:56","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fsi-thin-structure-experiencing-large-deformation-near-fixed-support\/"},"modified":"2024-12-12T21:26:16","modified_gmt":"2024-12-12T21:26:16","slug":"fsi-thin-structure-experiencing-large-deformation-near-fixed-support","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fsi-thin-structure-experiencing-large-deformation-near-fixed-support\/","title":{"rendered":"FSI &#8211; Thin structure experiencing large deformation near fixed support"},"content":{"rendered":"<p>&lt;p&gt;&lt;p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/12\/12-12-2024-1734026067-mceclip0.png\" \/><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/12\/12-12-2024-1734038763-mceclip1.jpg\" width=\"656\" height=\"487\" \/>&lt;\/p&gt;&lt;p&gt;Hello&lt;\/p&gt;&lt;p&gt;I am trying to conduct FSI with Transient structural and fluent for an aortic valve leaflet. The thin edge (purple) is assigned as the fixed support and the rest is the FSI interface. However, whenever I run the case a node very close to the fixed support experiences large deformation. I tried adjusting the mesh but I have had no luck.&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;background-color: #f1c40f;&#8221;&gt;(DP 0) Participant Solution encountered a fatal error. Message: The value of UX at node 139308 is 5.985503465E+10. &nbsp;It is greater than the current limit of 1000000 (which can be reset on the NCNV command). &nbsp;This generally indicates rigid body motion as a result of an unconstrained model. Please do not save the project if you would like to recover to the last saved state.&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;Would appreciate any suggestions on how to go about this issue.&lt;\/p&gt;&lt;\/p&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-397315","topic","type-topic","status-publish","hentry","topic-tag-fsi-transient-1","topic-tag-2-way-coupled-fsi","topic-tag-2-way-fsi","topic-tag-fsi","topic-tag-transient-structural"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"HelloI am trying to conduct FSI with Transient structural and fluent for an aortic valve leaflet. The thin edge (purple) is assigned as the fixed support and the rest is the FSI interface. However, whenever I run the case a node very close to the fixed support experiences large deformation. 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