{"id":457625,"date":"2026-05-05T17:39:55","date_gmt":"2026-05-05T17:39:55","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/inconsistent-result-in-coupled-harmonic-analysis\/"},"modified":"2026-05-05T17:39:55","modified_gmt":"2026-05-05T17:39:55","slug":"inconsistent-result-in-coupled-harmonic-analysis","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/inconsistent-result-in-coupled-harmonic-analysis\/","title":{"rendered":"Inconsistent result in coupled harmonic analysis"},"content":{"rendered":"<p>&lt;p&gt;Hi, I&#8217;m trying to run simulation for acoustic plane wave scattering from a solid sphere scatterer. This problem has an analytical solution that I can compare the solid stresses and the acoustic pressure at the cross-section of the sphere.&nbsp;&lt;\/p&gt;&lt;p&gt;I built the model in coupled harmonic analysis system, modelled as a water cube with a sphere in the middle and surrounded with a PML layer.&nbsp;&lt;\/p&gt;&lt;p&gt;I did a test run with 15 EPW mesh last week, and the stresses and acoustic pressure matched closely with the analytical solution. However, when I ran the exact model with the same settings again today, the results were very different and the difference to the analytical solution is more than 20% (vs. 2% that I got last week).&nbsp;&lt;\/p&gt;&lt;p&gt;I am very confused because this should give the same result. I even redo it in the new workbench file, created a brand new model and set up (with the same parameters in the previous file). And again, the result in the new file is different from the previous two attempts. So now I have three set of data for the same model.&nbsp;&lt;\/p&gt;&lt;p&gt;Did any one encounter similar issues before? Can anyone please give me some suggestions on how to cope with this?&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;Thank you very much.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-457625","topic","type-topic","status-publish","hentry","topic-tag-acoustic-1","topic-tag-fsi","topic-tag-fsi-simulation"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27791"],"_bbp_topic_id":["457625"],"_bbp_subscription":["482513","20905","58821"],"_bbp_author_ip":["128.40.45.9"],"_bbp_last_reply_id":["457781"],"_bbp_last_active_id":["457781"],"_bbp_last_active_time":["2026-05-07 13:00:59"],"_bbp_reply_count":["5"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["3"],"_bbp_engagement":["482513","20905","58821"],"_btv_view_count":["58"],"_bbp_topic_status":["unanswered"]},"test":"zcemwmzucl-ac-uk"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/457625","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\/457625\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=457625"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}