{"id":166407,"date":"2022-02-15T07:06:00","date_gmt":"2022-02-15T07:06:00","guid":{"rendered":"\/forum\/forums\/topic\/why-am-i-getting-different-flow-field-for-different-supersonic-initial-gauge-pressure\/"},"modified":"2022-02-23T07:13:39","modified_gmt":"2022-02-23T07:13:39","slug":"why-am-i-getting-different-flow-field-for-different-supersonic-initial-gauge-pressure","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/why-am-i-getting-different-flow-field-for-different-supersonic-initial-gauge-pressure\/","title":{"rendered":"Why am I getting different flow field for different Supersonic Initial Gauge Pressure?"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>In theory it is mentioned :<\/p>\n<p><strong>Supersonic\/Initial Gauge Pressure<\/strong>&nbsp;&nbsp;sets the static pressure on the boundary when the flow becomes (locally) supersonic.<\/p>\n<p>Now I am solving a CD nozzle problem with Inlet Stagnation pressure and temperature and outlet is ambient conditions.<\/p>\n<p>I have read papers where they have used either Method-1 or Method-2 <\/p>\n<p><strong>Method-1<\/strong><\/p>\n<ul>\n<li>Pressure Inlet = Total Pressure = Po<\/li>\n<li><strong>Supersonic\/Initial Gauge Pressure<\/strong>&nbsp;&nbsp;same as nozzle exit Ambient Pressure<\/li>\n<\/ul>\n<p><strong>Method-2<\/strong><\/p>\n<ul>\n<li>Pressure Inlet = Total Pressure = Po<\/li>\n<li><strong>Supersonic\/Initial Gauge Pressure<\/strong>&nbsp;&nbsp; = Same as Po or slightly lesser value than Po<\/li>\n<\/ul>\n<p>Now I am confused which solution should I actually go with, for me Method-2 seems more logical. <\/p>\n<p>So I tried running all cases but I am surprised that for different initial gauge pressure I tried, I am getting different flow field.<\/p>\n<p>I don&#039;t know why but only for Method-1 (as shown in Case-1 Image), I am getting same Total Pressure as I had mentioned in Pressure Inlet but for Method-2 (as shown in Case-2 Image) The Total Pressure I am getting is slightly higher.<\/p>\n<h3>Case-1 <strong>Supersonic\/Initial Gauge Pressure<\/strong>&nbsp;&nbsp;= Ambient Pressure <\/h3>\n<div class=\"embedExternal embedImage\">\n<div class=\"embedExternal-content\">\n<a class=\"embedImage-link\" href=\"\/forum\/wp-content\/uploads\/forum-uploads\/001\/SCKOBZQE7W4W.png\" rel=\"nofollow noopener\" target=\"_blank\"><br \/>\n<img decoding=\"async\" class=\"embedImage-img\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/001\/SCKOBZQE7W4W.png\" alt=\"Initial_Same_As_Ambient_Pressure.png\" \/><br \/>\n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-166407","topic","type-topic","status-closed","hentry","topic-tag-ansys-fluent","topic-tag-fluid","topic-tag-help-me-2","topic-tag-nozzle","topic-tag-supersonic-initial-gauge-pressure-2"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"In theory it is mentioned :Supersonic\/Initial Gauge Pressure sets the static pressure on the boundary when the flow becomes (locally) supersonic.Now I am solving a CD nozzle problem with Inlet Stagnation pressure and temperature and outlet is ambient conditions.I have read papers where they have used either Method-1 or Method-2 Method-1Pressure Inlet = Total Pressure =\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/why-am-i-getting-different-flow-field-for-different-supersonic-initial-gauge-pressure\/\" \/>\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=\"Why am I getting different flow field for different Supersonic Initial Gauge Pressure? 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