{"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":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"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\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/high-velocity-flow-of-air-in-tube\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"High velocity flow of air in tube | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"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\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/high-velocity-flow-of-air-in-tube\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2025-01-06T11:20:12+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2025-01-06T11:20:12+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"High velocity flow of air in tube | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"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\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/high-velocity-flow-of-air-in-tube\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/mach\\\/#listItem\",\"name\":\"mach\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/mach\\\/#listItem\",\"position\":3,\"name\":\"mach\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/mach\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/high-velocity-flow-of-air-in-tube\\\/#listItem\",\"name\":\"High velocity flow of air in tube\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/high-velocity-flow-of-air-in-tube\\\/#listItem\",\"position\":4,\"name\":\"High velocity flow of air in tube\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/mach\\\/#listItem\",\"name\":\"mach\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/high-velocity-flow-of-air-in-tube\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/high-velocity-flow-of-air-in-tube\\\/\",\"name\":\"High velocity flow of air in tube | Ansys Learning Forum\",\"description\":\"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\",\"inLanguage\":\"en-US\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/high-velocity-flow-of-air-in-tube\\\/#breadcrumblist\"},\"datePublished\":\"2025-01-06T11:20:12+00:00\",\"dateModified\":\"2025-01-06T11:20:12+00:00\"},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"inLanguage\":\"en-US\",\"publisher\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\"}}]}\n\t\t<\/script>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"High velocity flow of air in tube | Ansys Learning Forum","description":"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","canonical_url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/high-velocity-flow-of-air-in-tube\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/high-velocity-flow-of-air-in-tube\/#breadcrumblist","itemListElement":[{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum#listItem","position":1,"name":"Home","item":"https:\/\/innovationspace.ansys.com\/forum","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/topics\/#listItem","name":"Topics"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/topics\/#listItem","position":2,"name":"Topics","item":"https:\/\/innovationspace.ansys.com\/forum\/topics\/","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/mach\/#listItem","name":"mach"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum#listItem","name":"Home"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/mach\/#listItem","position":3,"name":"mach","item":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/mach\/","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/high-velocity-flow-of-air-in-tube\/#listItem","name":"High velocity flow of air in tube"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/topics\/#listItem","name":"Topics"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/high-velocity-flow-of-air-in-tube\/#listItem","position":4,"name":"High velocity flow of air in tube","previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/mach\/#listItem","name":"mach"}}]},{"@type":"Organization","@id":"https:\/\/innovationspace.ansys.com\/forum\/#organization","name":"Ansys Learning Forum","description":"Ansys Innovation Space","url":"https:\/\/innovationspace.ansys.com\/forum\/"},{"@type":"WebPage","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/high-velocity-flow-of-air-in-tube\/#webpage","url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/high-velocity-flow-of-air-in-tube\/","name":"High velocity flow of air in tube | Ansys Learning Forum","description":"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","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#website"},"breadcrumb":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/high-velocity-flow-of-air-in-tube\/#breadcrumblist"},"datePublished":"2025-01-06T11:20:12+00:00","dateModified":"2025-01-06T11:20:12+00:00"},{"@type":"WebSite","@id":"https:\/\/innovationspace.ansys.com\/forum\/#website","url":"https:\/\/innovationspace.ansys.com\/forum\/","name":"Ansys Learning Forum","description":"Ansys Innovation Space","inLanguage":"en-US","publisher":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#organization"}}]},"og:locale":"en_US","og:site_name":"Ansys Learning Forum | Ansys Innovation Space","og:type":"article","og:title":"High velocity flow of air in tube | Ansys Learning Forum","og:description":"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","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/high-velocity-flow-of-air-in-tube\/","article:published_time":"2025-01-06T11:20:12+00:00","article:modified_time":"2025-01-06T11:20:12+00:00","twitter:card":"summary_large_image","twitter:title":"High velocity flow of air in tube | Ansys Learning Forum","twitter:description":"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"},"aioseo_meta_data":{"post_id":"403700","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":"default","schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"limit_modified_date":false,"created":"2025-10-19 10:59:47","updated":"2025-10-19 10:59:47","ai":null,"breadcrumb_settings":null,"seo_analyzer_scan_date":null},"aioseo_breadcrumb":"<div class=\"aioseo-breadcrumbs\"><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\" title=\"Home\">Home<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\/topics\/\" title=\"Topics\">Topics<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/mach\/\" title=\"mach\">mach<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tHigh velocity flow of air in tube\n\t\t<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/innovationspace.ansys.com\/forum"},{"label":"Topics","link":"https:\/\/innovationspace.ansys.com\/forum\/topics\/"},{"label":"mach","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/mach\/"},{"label":"High velocity flow of air in tube","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/high-velocity-flow-of-air-in-tube\/"}],"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":["318"],"_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}]}}