{"id":314273,"date":"2023-11-01T06:50:56","date_gmt":"2023-11-01T06:50:56","guid":{"rendered":"\/forum\/forums\/topic\/floating-point-exception-error-in-a-2-way-fsi-simulation\/"},"modified":"2023-11-01T06:50:56","modified_gmt":"2023-11-01T06:50:56","slug":"floating-point-exception-error-in-a-2-way-fsi-simulation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/floating-point-exception-error-in-a-2-way-fsi-simulation\/","title":{"rendered":"Floating Point Exception Error in a 2-way FSI Simulation"},"content":{"rendered":"<p>Hi,<\/p>\n<p>I am doing a 2-way fsi simulation for a rectangular channel with deformable walls. Usually, when I have an error with such simulation case, it is either negative cell volume in the fluid domain or excessive deformation in the solid so I try to reduce the time step or ramp the applied inlet pressure or flowrate slowly.<\/p>\n<p>Lately, I have been using higher inlet pressures and suddenly the floating point error started to appear. I am increasing the inlet pressure constantly every step and the message pops always when I reach ~100 KPa pressure with no spike in the residual plots. I am using a laminar model because I don&#8217;t expect the velocities to be that high (Remax= 338.51 before the simulation stopped). I am also using the default dynamic mesh options for the deformable walls&nbsp; (smoothing and implicit update). Below is a picture of my fluid domain mesh in the cross-section:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/11\/01-11-2023-1698821083-Screenshot 2023-10-31 155904.png\" alt=\"\" width=\"699\" height=\"349\"><\/p>\n<p>The orthogonal quality is high except at the edges of the boundary layer elements.<\/p>\n<p>I tried to reduce the time steps and change the model to k-w SST with low Re correction but nothing worked. Could someone please let me know what should I look for to resolve this error.<\/p>\n<p>Thank you.<\/p>\n","protected":false},"template":"","class_list":["post-314273","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["182811","13659"],"_bbp_author_ip":["168.143.243.24"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["346"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["314273"],"_bbp_forum_id":["27792"],"_bbp_engagement":["13659","182811"],"_bbp_voice_count":["2"],"_bbp_reply_count":["8"],"_bbp_last_reply_id":["343776"],"_bbp_last_active_id":["343776"],"_bbp_last_active_time":["2024-01-09 08:23:07"]},"test":"mahdi_171"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/314273","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\/314273\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=314273"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}