{"id":317486,"date":"2023-11-13T18:00:55","date_gmt":"2023-11-13T18:00:55","guid":{"rendered":"\/forum\/forums\/topic\/high-mach-number-and-linear-solver-overflow-fatal-error\/"},"modified":"2023-11-13T18:00:55","modified_gmt":"2023-11-13T18:00:55","slug":"high-mach-number-and-linear-solver-overflow-fatal-error","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/high-mach-number-and-linear-solver-overflow-fatal-error\/","title":{"rendered":"High Mach number and Linear solver overflow fatal error"},"content":{"rendered":"<p>I am try to simulate a steady state centrifugal compressor and my rotating speed is such that at the tip mach number reaches upto 1.2. When I run simulation using only volute, impeller and inlet pipe it runs fine, but when i add ported shroud or backspace, after feq iterations I get high mach number locally at blade tip and linear solver fails.<\/p>\n<p>Does anyone know best practice, how to start such simulations?<\/p>\n<p>simulating using first order, laminar, with low speed, low mass flow rate?<\/p>\n","protected":false},"template":"","class_list":["post-317486","topic","type-topic","status-closed","hentry","topic-tag-ansys-cfx","topic-tag-compressor"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["2800","13659"],"_bbp_author_ip":["96.7.218.223"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["1360"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["317486"],"_bbp_forum_id":["27792"],"_bbp_engagement":["2800","13659"],"_bbp_voice_count":["2"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["317828"],"_bbp_last_active_id":["317828"],"_bbp_last_active_time":["2023-11-15 15:26:38"]},"test":"abhishekkumar-shingalaitsm-uni-stuttgart-de"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/317486","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\/317486\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=317486"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}