{"id":455951,"date":"2026-04-07T14:41:17","date_gmt":"2026-04-07T14:41:17","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/error-when-following-2-way-fsi-tutorial-for-oscillating-plate\/"},"modified":"2026-04-07T14:41:17","modified_gmt":"2026-04-07T14:41:17","slug":"error-when-following-2-way-fsi-tutorial-for-oscillating-plate","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/error-when-following-2-way-fsi-tutorial-for-oscillating-plate\/","title":{"rendered":"Error when following 2-way FSI tutorial for oscillating plate"},"content":{"rendered":"<p>&lt;p&gt;Hi everyone,&nbsp;&lt;\/p&gt;&lt;p&gt;I&#8217;m trying to get into Fluent, specifically for 2-way FSI later on (for reference, I&#8217;m using R2025.2 with an academic license).&lt;\/p&gt;&lt;p&gt;I&#8217;ve been following this tutorial (as seen in the picture) https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/tutorial-system-coupling-tutorial-oscillating-plate-with-two-way-fluid-structure-interaction-using-fluent-r17-2\/ \/ https:\/\/www.youtube.com\/watch?v=FN2MfWBv3Sk and have ran into some issues when starting the solution.&nbsp;&lt;\/p&gt;&lt;p&gt;The System Coupling Element is awaiting connection from the participants and then throwing an error:&lt;\/p&gt;&lt;p&gt;&#8221;<em>System coupling solution stopped before all participants connected. A<\/em>&lt;br&gt;<em>solver failure occurred during the run in the Fluid Flow (Fluent) system<\/em>&#8221; &nbsp;&nbsp;&lt;\/p&gt;&lt;p&gt;Beforehand, these are the warnings I&#8217;m getting:&lt;\/p&gt;&lt;p&gt;| <em>Warnings were found during data model validation.&nbsp; <\/em>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&lt;br&gt;+&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;+&lt;br&gt;| <em>Warning: Participant Fluid Flow (Fluent) (Solution) has the&nbsp; &nbsp;<\/em> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;br&gt;| <em>ExecutionControl &#8216;Option&#8217; set to &#8216;ExternallyManaged&#8217;. System Coupling&nbsp; &nbsp;<\/em>&lt;br&gt;<em>| will not control the startup\/shutdown behavior of this participant.&nbsp; &nbsp;<\/em> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&lt;br&gt;<em>| Warning: Participant Transient Structural (Solution 1) has the&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<\/em>&lt;br&gt;<em>| ExecutionControl &#8216;Option&#8217; set to &#8216;ExternallyManaged&#8217;. System Coupling&nbsp; &nbsp;<\/em>&lt;br&gt;<em>| will not control the startup\/shutdown behavior of this participant.&nbsp; &nbsp; &nbsp;<\/em>&lt;br&gt;<em>| Warning: Unused input variables [&#8216;Force_Density&#8217;] (FDNS) on region FSIN_1&nbsp; &nbsp;<\/em>&lt;br&gt;<em>| for Transient Structural (CouplingParticipant:Solution 1).&nbsp; &nbsp; &nbsp;<\/em> &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&lt;\/p&gt;&lt;p&gt;I&#8217;m not quite sure how to fix this. So far, I&#8217;ve tried changing from Fluid Solid Interface to System Coupling Region and turning off the license sharing. Neither changed anything. Grateful for any help.&lt;\/p&gt;&lt;p&gt;Cheers&nbsp;&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/04\/07-04-2026-1775572563-Screenshot 2026-04-07 163059.png\" alt=\"\" width=\"560\" height=\"337\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-455951","topic","type-topic","status-publish","hentry","topic-tag-2-way-fsi","topic-tag-ansys-fluent","topic-tag-system-coupling","topic-tag-transient-structural"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["455951"],"_bbp_subscription":["428699"],"_bbp_author_ip":["2a00:8a60:c010:1::1:1018"],"_bbp_last_reply_id":["0"],"_bbp_last_active_id":["455951"],"_bbp_last_active_time":["2026-04-07 14:41:17"],"_bbp_reply_count":["0"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["1"],"_bbp_engagement":["428699"],"_btv_view_count":["12"],"_bbp_topic_status":["unanswered"]},"test":"paula-dreinerrwth-aachen-de"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/455951","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\/455951\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=455951"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}