{"id":253605,"date":"2023-03-13T10:38:57","date_gmt":"2023-03-13T10:38:57","guid":{"rendered":"\/forum\/forums\/topic\/harmonic-acoustics-transmission-loss-results-error\/"},"modified":"2025-03-18T11:31:56","modified_gmt":"2025-03-18T11:31:56","slug":"harmonic-acoustics-transmission-loss-results-error","status":"answered","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/harmonic-acoustics-transmission-loss-results-error\/","title":{"rendered":"Harmonic Acoustics Transmission Loss Results Error"},"content":{"rendered":"

I am attempting to simulate transmission loss in a muffler and tailpipe using the harmonic acoustics module. I keep getting three different error messages:<\/p>\n

    \n
  1. An error occurred when the post processor attempted to load a specific result. Please review all messages. (the most common error)<\/li>\n
  2. The input power at the driven port is equal to zero. Please check the port definitions. (second most common)<\/li>\n
  3. An error occurred inside the POST PROCESSING module. (least common error)<\/li>\n<\/ol>\n

    I was first using Ansys Student 2023 R1 and thought there may be a bug in the software so I did a complete uninstall and tried Anysy Student 2022 R2, but am still having the exact same problem. <\/p>\n

    I have tried unchecking dstributed solve and using only one CPU core, but it is the same outcome as cheking distributed using 4 cores.<\/p>\n

    I have tried different methods of creating geometry, including STEP import, IGES import, and creating the geometry from within DesignModeler. All have the same outcome.<\/p>\n

    I have only gotten a result 2 times out of several dozen different attepts. The two results were with a very simple straight cylindrical geometry modeled in DesignModeler that was just an extrude by 12inches of a 4inch diameter circle.<\/p>\n

    The only thing unusual I have noticed is the solution steps do not match the setting in Project>Model>Harmonic Acoustics>Analysis Settings>Options>Solution Intervals. Of the last three solve attempts, first I left it at the default 10Hz and it solved at 600Hz steps. Then I put 600Hz and it solved at 10Hz Steps. Then I put 1000Hz step and it solved at 6Hz steps. EDIT:<\/strong> Just realized “Solution Interval” is actually the number of steps and not the step amount in Hz. So this is no longer an issue. That’s a bit counter-intuitive to me.<\/p>\n

    Also worth noting, I set Project>Model>Harmonic Acoustics>Port In Duct>Pressure Amplitude to 0.5psi. Not sure why I am getting error #2 above.<\/p>\n

    Does anyone have any suggestions or see anything i may have set up wrong?<\/p>\n","protected":false},"template":"","class_list":["post-253605","topic","type-topic","status-answered","hentry","topic-tag-cad-import","topic-tag-harmonic-acoustics","topic-tag-postprocessing","topic-tag-sound-transmission-loss"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["277921","50680","289967"],"_bbp_author_ip":["23.56.168.214"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["2244"],"_edit_lock":["1678704104:209453"],"_bbp_topic_status":["answered"],"_bbp_status":["publish"],"_bbp_topic_id":["253605"],"_bbp_forum_id":["27784"],"_bbp_engagement":["50680","277921","289967"],"_bbp_voice_count":["3"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["302836"],"_bbp_last_active_id":["302836"],"_bbp_last_active_time":["2023-08-23 04:46:05"]},"test":"dlmcculg-clemson-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/253605","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":1,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/253605\/revisions"}],"predecessor-version":[{"id":426020,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/253605\/revisions\/426020"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=253605"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}