{"id":39780,"date":"2019-12-22T17:36:40","date_gmt":"2019-12-22T17:36:40","guid":{"rendered":"\/forum\/forums\/topic\/harmonic-acoustic-with-mean-flow\/"},"modified":"2019-12-22T17:36:40","modified_gmt":"2019-12-22T17:36:40","slug":"harmonic-acoustic-with-mean-flow","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/harmonic-acoustic-with-mean-flow\/","title":{"rendered":"Harmonic Acoustic with Mean Flow"},"content":{"rendered":"<p>Hi everbody,<\/p>\n<p><\/p>\n<p>I am working on the case about the effect of mean flow in Helmholtz Resonator. For this case, I am using an article and uploaded the article below. I validated the model no mean flow with using Acoustic Extension in Harmonic Response at version 18.1. Also validate at version 19.2 without Acoustic Extension. But I have a problem:<\/p>\n<p><\/p>\n<p>My model doesn&#8217;t work with mean flow. I applied mean flow inlet surface with the right direction. Transmission loss and resonance frequency don&#8217;t shift at any mean flow value. I get the same Transmission Loss Graph. But expected that it must be increase resonance frequency and decrease transmission loss amplitude. I tried another muffler model in ANSYS Verify Manual with mean flow then it works.<\/p>\n<p><\/p>\n<p>What would be the problems?<\/p>\n<p><\/p>\n<p>The model&nbsp;details and results in the article are below :<\/p>\n<p><\/p>\n<p><strong>1) TL graph in the article<\/strong><\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/089cfb1e-c9cc-462b-a441-aa7700fc9e89\/c0e1ec4a-66d3-45e2-88c9-ab2b011fa7ba_tl.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p><strong>2) TL result with Harmonic Response using Acoustic Extension<\/strong><\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/089cfb1e-c9cc-462b-a441-aa7700fc9e89\/c10edaee-0d21-4396-a581-ab2b0120330a_tl-ansys.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p><strong>3) Boundary Conditions and Geometric Model<\/strong><\/p>\n<p><\/p>\n<p>&nbsp;<img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/089cfb1e-c9cc-462b-a441-aa7700fc9e89\/fb24401c-1483-4ad4-a1bb-ab2b011e1a8c_model.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p><strong>4)&nbsp;Model Tree<\/strong><\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/089cfb1e-c9cc-462b-a441-aa7700fc9e89\/5898ffd7-fd84-407c-9eba-ab2b0120b83c_model-details.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>Thank you for help<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-39780","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["11959"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["602"],"_bbp_subscription":["240969"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["39780"],"_bbp_forum_id":["27791"],"_bbp_engagement":["143022"],"_bbp_voice_count":["1"],"_bbp_reply_count":["0"],"_bbp_last_reply_id":["0"],"_bbp_last_active_id":["39780"],"_bbp_last_active_time":["2019-12-22 17:36:40"]},"test":"omerfrkunl"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/39780","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\/39780\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=39780"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}