{"id":163336,"date":"2021-10-24T20:34:14","date_gmt":"2021-10-24T20:34:14","guid":{"rendered":"\/forum\/forums\/topic\/what-is-the-reason-of-absorbtion-coefficient-too-small-or-zero-on-impedance-tube-simulation\/"},"modified":"2021-11-25T09:30:03","modified_gmt":"2021-11-25T09:30:03","slug":"what-is-the-reason-of-absorbtion-coefficient-too-small-or-zero-on-impedance-tube-simulation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/what-is-the-reason-of-absorbtion-coefficient-too-small-or-zero-on-impedance-tube-simulation\/","title":{"rendered":"What is the reason of Absorbtion Coefficient too small or zero on Impedance Tube Simulation?"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>Hello,<\/p>\n<p>I am trying to simulate Impedance Tube and obtain absorption coefficient. <\/p>\n<p>I have three body including 2 acoustic body(air) and 1 structural (absorber). <\/p>\n<p>I define surface velocity as 0.01 mm\/s on port and it is also radiation boundary.<\/p>\n<p>I define rigid wall on the other side of tube. <\/p>\n<p>I define fluid solid interface automatically.<\/p>\n<p>I define displacement 0 on both direction for absorber.<\/p>\n<p>I check a lot of article and tutorial but I can not understand what is my mistake. <\/p>\n<p>I need someone guidance. Please help. Thank you. <\/p>\n<div class=\"embedExternal embedImage\">\n<div class=\"embedExternal-content\">\n<a class=\"embedImage-link\" href=\"\/forum\/wp-content\/uploads\/forum-uploads\/536\/ZQF0A26K2CZY.png\" rel=\"nofollow noopener\" target=\"_blank\"><br \/>\n<img decoding=\"async\" class=\"embedImage-img\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/536\/ZQF0A26K2CZY.png\" alt=\"image.png\" \/><br \/>\n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-163336","topic","type-topic","status-closed","hentry","topic-tag-absorption-coefficient-1","topic-tag-harmonic-analysis","topic-tag-vibro-acoustic"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":[""],"_bbp_old_reply_author_name_id":["Anonymous"],"_bbp_old_is_reply_anonymous_id":["false"],"_btv_view_count":["1961"],"_bbp_likes_count":["0"],"_bbp_subscription":["231660","225991","268573"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["163336"],"_bbp_forum_id":["27791"],"_bbp_engagement":["58821","184314","225991","241355","268573"],"_bbp_voice_count":["5"],"_bbp_reply_count":["16"],"_bbp_last_reply_id":["242469"],"_bbp_last_active_id":["242469"],"_bbp_last_active_time":["2022-11-30 07:58:50"]},"test":"nurionur"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/163336","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\/163336\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=163336"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}