{"id":437319,"date":"2025-07-21T13:36:51","date_gmt":"2025-07-21T13:36:51","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/predict-wings-flutter-using-aerodynamic-damping\/"},"modified":"2025-07-21T13:36:51","modified_gmt":"2025-07-21T13:36:51","slug":"predict-wings-flutter-using-aerodynamic-damping","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/predict-wings-flutter-using-aerodynamic-damping\/","title":{"rendered":"Predict Wing&#8217;s Flutter Using Aerodynamic Damping"},"content":{"rendered":"<p>&lt;p&gt;Hey Ansys Forum,&lt;\/p&gt;&lt;p&gt;I am trying to predict wing&#8217;s flutter with a less expensive computational method than 2WAY-FSI. I have seen a method about calculting aerodynamic damping (if AD&gt;0 then system damped if AD&lt;0 then flutter occured). In this ANSYS link says that i can use Transient Blade Mode (CFX) that has built-in the parameter of AD.&lt;\/p&gt;&lt;p&gt;https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-to-use-the-aerodynamic-damping-capability-of-tbr-for-non-turbo-applications\/&lt;\/p&gt;&lt;p dir=&#8221;auto&#8221;&gt;I followed the instructions, and as I increased the speed, the variable increased positively, which seems strange to me. For this reason, I would like to share the process I followed so you can help me identify if I made any mistake somewhere.&lt;\/p&gt;&lt;p dir=&#8221;auto&#8221;&gt;the instructions i followed are from this video:&lt;\/p&gt;&lt;p dir=&#8221;auto&#8221;&gt;https:\/\/www.youtube.com\/watch?v=CuaMKl0IllM&lt;\/p&gt;&lt;p dir=&#8221;auto&#8221;&gt;I did everything it says (according to my problem) except the normalization step, since at first i want to find if it&#8217;s negative or positive.&lt;\/p&gt;&lt;p dir=&#8221;auto&#8221;&gt;What&#8217;s wrong? Isn&#8217;t this methodology suitable for my wing&#8217;s flutter problem? If anyone could help it will be apriciated.&lt;\/p&gt;&lt;p dir=&#8221;auto&#8221;&gt;Just to clarify in CFX I use only the flyid domain, so the Boundary, in which i Calculate the AD are the Fluid Faces Interaction (i dont know if that the problem an i have to input the structural geometry in CFX also)&nbsp;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-437319","topic","type-topic","status-publish","hentry","topic-tag-aerodynamic-damping"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["437319"],"_bbp_subscription":["54612","68667","15845"],"_bbp_author_ip":["2001:648:2800:1913:91b2:6f70:223c:7dda"],"_bbp_last_reply_id":["439264"],"_bbp_last_active_id":["439264"],"_bbp_last_active_time":["2025-08-13 23:12:06"],"_bbp_reply_count":["5"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["3"],"_bbp_engagement":["54612","68667","15845"],"_btv_view_count":["351"],"_bbp_topic_status":["unanswered"],"_bbp_notification_enabled":["54612"]},"test":"gstzortzmeng-auth-gr"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/437319","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\/437319\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=437319"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}