{"id":366993,"date":"2024-05-15T19:22:17","date_gmt":"2024-05-15T19:22:17","guid":{"rendered":"\/forum\/forums\/topic\/creating-udf-but-not-obtaining-expected-result\/"},"modified":"2024-05-15T19:22:17","modified_gmt":"2024-05-15T19:22:17","slug":"creating-udf-but-not-obtaining-expected-result","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/creating-udf-but-not-obtaining-expected-result\/","title":{"rendered":"Creating UDF but not obtaining expected result"},"content":{"rendered":"<p>I am trying to create a user defined function to calculated adiabatic wall temperature on an airfoil surface. Adiabatic wall temperature is defined as Taw = Tstatic + Pr^1\/3*(Ttotal &#8211; Tstatic) so the adiabatic wall temperature should not be lower than the static temperature.<\/p>\n<p>I created the UDF and then created a contour of the UDF on the airfoil surface. The adiabatic wall temperature UDF&nbsp;contour is several hundred degrees lower than the static temperature which was odd to me. I then made a UDF that is just the static temperature and plotted a contour of that. It should look identical to the static temperature contour but the UDF of static tempearture is also several hundred degrees lower than the static temperature. These two temperatures should be equal.<\/p>\n<p>Am I doing something wrong in my implementation of UDFs?<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/15-05-2024-1715800926-Capture.JPG\" alt=\"\"><\/p>\n","protected":false},"template":"","class_list":["post-366993","topic","type-topic","status-closed","hentry","topic-tag-fluent-ansys-1","topic-tag-ansys-cfd-1","topic-tag-surface-temperature-1"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I am trying to create a user defined function to calculated adiabatic wall temperature on an airfoil surface. Adiabatic wall temperature is defined as Taw = Tstatic + Pr^1\/3*(Ttotal - Tstatic) so the adiabatic wall temperature should not be lower than the static temperature.I created the UDF and then created a contour of the UDF\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/creating-udf-but-not-obtaining-expected-result\/\" \/>\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=\"Creating UDF but not obtaining expected result | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"I am trying to create a user defined function to calculated adiabatic wall temperature on an airfoil surface. Adiabatic wall temperature is defined as Taw = Tstatic + Pr^1\/3*(Ttotal - Tstatic) so the adiabatic wall temperature should not be lower than the static temperature.I created the UDF and then created a contour of the UDF\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/creating-udf-but-not-obtaining-expected-result\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/15-05-2024-1715800926-Capture.JPG\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/15-05-2024-1715800926-Capture.JPG\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-05-15T19:22:17+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-05-15T19:22:17+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Creating UDF but not obtaining expected result | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"I am trying to create a user defined function to calculated adiabatic wall temperature on an airfoil surface. Adiabatic wall temperature is defined as Taw = Tstatic + Pr^1\/3*(Ttotal - Tstatic) so the adiabatic wall temperature should not be lower than the static temperature.I created the UDF and then created a contour of the UDF\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/15-05-2024-1715800926-Capture.JPG\" \/>\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\\\/creating-udf-but-not-obtaining-expected-result\\\/#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\\\/#fluent-#ansys-1\\\/#listItem\",\"name\":\"#fluent-#ansys\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/#fluent-#ansys-1\\\/#listItem\",\"position\":3,\"name\":\"#fluent-#ansys\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/#fluent-#ansys-1\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/creating-udf-but-not-obtaining-expected-result\\\/#listItem\",\"name\":\"Creating UDF but not obtaining expected result\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/creating-udf-but-not-obtaining-expected-result\\\/#listItem\",\"position\":4,\"name\":\"Creating UDF but not obtaining expected result\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/#fluent-#ansys-1\\\/#listItem\",\"name\":\"#fluent-#ansys\"}}]},{\"@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\\\/creating-udf-but-not-obtaining-expected-result\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/creating-udf-but-not-obtaining-expected-result\\\/\",\"name\":\"Creating UDF but not obtaining expected result | Ansys Learning Forum\",\"description\":\"I am trying to create a user defined function to calculated adiabatic wall temperature on an airfoil surface. 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