{"id":403700,"date":"2025-01-06T11:20:12","date_gmt":"2025-01-06T11:20:12","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/high-velocity-flow-of-air-in-tube\/"},"modified":"2025-01-06T11:20:12","modified_gmt":"2025-01-06T11:20:12","slug":"high-velocity-flow-of-air-in-tube","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/high-velocity-flow-of-air-in-tube\/","title":{"rendered":"High velocity flow of air in tube"},"content":{"rendered":"<p>&lt;p&gt;I am running a simulation where air ideal gas is passing through tube in CFX. The air ideal gas is selected to account for compressiblity effect. The speed of gas is 100 m\/s at inlet. I am getting high mach no. related warning and it is stopping due to floating point error. I have given pressure at outlet around -50 Pa and velocity of 100 m\/s at inlet. I have tried same case with giving mass flow rate at inlet but it is calculating a very low velocity and very high density at inlet. How to proceed with this simulation?&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-403700","topic","type-topic","status-publish","hentry","topic-tag-ansys-cfx","topic-tag-high-speed","topic-tag-mach"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["403700"],"_bbp_author_ip":["165.225.124.153"],"_bbp_last_reply_id":["404360"],"_bbp_last_active_id":["404360"],"_bbp_last_active_time":["2025-01-10 05:11:44"],"_bbp_reply_count":["6"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["3"],"_bbp_engagement":["63467","199","62368"],"_btv_view_count":["231"],"_bbp_topic_status":["unanswered"],"_bbp_subscription":["199","62368","63467"]},"test":"rashi-guptage-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/403700","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\/403700\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=403700"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}