{"id":242969,"date":"2022-12-05T16:16:26","date_gmt":"2022-12-05T16:16:26","guid":{"rendered":"\/forum\/forums\/topic\/mixing-plane-in-centrifugal-compressor\/"},"modified":"2022-12-05T16:19:01","modified_gmt":"2022-12-05T16:19:01","slug":"mixing-plane-in-centrifugal-compressor","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mixing-plane-in-centrifugal-compressor\/","title":{"rendered":"Mixing Plane in Centrifugal Compressor"},"content":{"rendered":"<p><span style=\"font-size: 12pt\">Hello everyone,<\/span><\/p>\n<p><span style=\"font-size: 12pt\">I&#8217;m running a RANS steady-state simulation of a centrifugal compressor stage (impeller + vaned diffuser) by means of Ansys CFX. Between the rotor and the diffuser, I&#8217;m imposing a mixing plane. However, I&#8217;m experiencing a weird behavior of the Mach number on the mixing plane: at the 95% of the bladespan, it shows a stripe where it&#8217;s null. I noticed that this stripe is at the boundary between the jet (flow with high momentum, directed towards the diffuser) and the wake (flow with low momentum, reversed towards the impeller outlet). My idea is that in this region the mass flow rate is null and it has a detrimental effect on the averaging process of the mixing plane.<\/span><\/p>\n<p><span style=\"font-size: 12pt\">Is there anybody who met the same problem?<\/span><\/p>\n<p><span style=\"font-size: 12pt\"><a class=\"wp-colorbox-image cboxElement\" href=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/12\/05-12-2022-1670256885-mceclip0.png\"><img decoding=\"async\" title=\"Mixing Plane Impeller Side\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/12\/05-12-2022-1670257093-mceclip0.png\" alt=\"Mach number in relative frame on the mixing plane, impeller side\"><img decoding=\"async\" title=\"Mixing Plane on the Diffuser Side\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/12\/05-12-2022-1670256885-mceclip0.png\" alt=\"Mach number in stn frame on the mixing plane diffuser side\"><\/a><\/span><\/p>\n","protected":false},"template":"","class_list":["post-242969","topic","type-topic","status-closed","hentry","topic-tag-ansys-cfx","topic-tag-centrifugal-impeller-1","topic-tag-mixing-plane-1","topic-tag-reverse-flow-2"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["269774","68667"],"_bbp_author_ip":["23.44.170.61"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["1832"],"_edit_lock":["1670257084:199389"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["242969"],"_bbp_forum_id":["27792"],"_bbp_engagement":["68667","269774"],"_bbp_voice_count":["2"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["243565"],"_bbp_last_active_id":["243565"],"_bbp_last_active_time":["2022-12-09 14:17:11"]},"test":"leonardo-provanapolimi-it"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/242969","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\/242969\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=242969"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}