{"id":314876,"date":"2023-11-04T11:51:19","date_gmt":"2023-11-04T11:51:19","guid":{"rendered":"\/forum\/forums\/topic\/fsi-of-composite-wing-ansys-acp-mechanical-fluent-systemcoupling\/"},"modified":"2023-11-04T17:47:15","modified_gmt":"2023-11-04T17:47:15","slug":"fsi-of-composite-wing-ansys-acp-mechanical-fluent-systemcoupling","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fsi-of-composite-wing-ansys-acp-mechanical-fluent-systemcoupling\/","title":{"rendered":"FSI of composite wing (Ansys ACP + Mechanical + Fluent + SystemCoupling)"},"content":{"rendered":"

Hi<\/p>\n

I am encountering a very strange ?bug? during the preprocessing stage of FSI simulations. My wing is cut into surfaces, which are used in ACP to assign different composite lay up properties. I have CFD (Fluent) and FEM (Mechanical) models prepared and working well separately. To achive coupling I have to define system coupling region in mechanical, where the problem is as follows:<\/p>\n

I cannot select all surfaces of wing to one System Coupling Region. If I select all of them (doesnt matter if using geometry or named selection), “scope” is still yellow and there are “?” signs as shown in attached screenshot.\"\"<\/a><\/p>\n

I thought it may be a result of poor surface quality near the tip and edge, but then I found out that I could select every surface if I seperate them in two System Coupling Regions: first for 1st layer surfs:
<\/a><\/p>\n

and second for all the rest:<\/p>\n

<\/a><\/p>\n

 <\/p>\n

As you can see, there are no “?” signs if I select surfs separately. Unfortunately you have to have only one SystemCouplingRegion, otherwise there is an error in System Coupling module.<\/p>\n

Looking forward for advice, as I’ve been struggling with consequences of this problem for some time.. I was able to temporarily overcome this issue as I decided to procceed, hoping that mapping will work well enough without this edge surfs selected in System Coupling Region, but during calculations, when displacements get bigger, the CFD mesh is getting coarse and negative volumes appear in this edge region, causing the analysis to diverge.  <\/p>\n

<\/a><\/p>\n

I suppose this is the result of uncomplete selection of this System Coupling Region, please tell me if I’m wrong.<\/p>\n

Best Regards<\/p>\n

Mateusz<\/p>\n","protected":false},"template":"","class_list":["post-314876","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["272124","805"],"_bbp_author_ip":["104.102.248.140"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["767"],"_edit_lock":["1699119988:202213"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["314876"],"_bbp_forum_id":["27792"],"_bbp_engagement":["805","272124"],"_bbp_voice_count":["2"],"_bbp_reply_count":["9"],"_bbp_last_reply_id":["315261"],"_bbp_last_active_id":["315261"],"_bbp_last_active_time":["2023-11-07 14:06:28"]},"test":"mpiecuchstudent-agh-edu-pl"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/314876","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\/314876\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=314876"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}