{"id":393684,"date":"2024-11-12T03:01:11","date_gmt":"2024-11-12T03:01:11","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/udf-for-defining-density\/"},"modified":"2024-11-12T03:24:58","modified_gmt":"2024-11-12T03:24:58","slug":"udf-for-defining-density","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/udf-for-defining-density\/","title":{"rendered":"udf for defining density"},"content":{"rendered":"<p>&lt;p&gt;&lt;p&gt;&lt;p&gt;&lt;p&gt;I want to use temperature-dependent density for the gas phase (secondary phase) in my VOF multiphase model. The udf is as follows:&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;#include &#8220;udf.h&#8221;&lt;\/p&gt;&lt;p&gt;#include &#8220;math.h&#8221;&lt;\/p&gt;&lt;p&gt;DEFINE_PROPERTY(cell_density,c,t)&lt;\/p&gt;&lt;p&gt;{&lt;\/p&gt;&lt;p&gt;\/* Declare local variables *\/&lt;\/p&gt;&lt;p&gt;real g_density;&lt;\/p&gt;&lt;p&gt;real temp;&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;\/* Retrieve temperature of phase 2 *\/&lt;\/p&gt;&lt;p&gt;Thread *phase_thread = THREAD_SUB_THREAD(t, 1);&lt;\/p&gt;&lt;p&gt;temp = C_T_M1(c, phase_thread);&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;\/* Apply temperature-dependent density correlation *\/&lt;\/p&gt;&lt;p&gt;if (temp &gt; 273.0) &lt;\/p&gt;&lt;p&gt;&lt;\/p&gt;&lt;p&gt;g_density = 486.27 * pow(temp, -1.0);&lt;\/p&gt;&lt;p&gt; else &lt;\/p&gt;&lt;p&gt;&nbsp;g_density = 1.63;&lt;\/p&gt;&lt;p&gt;return g_density;&lt;\/p&gt;&lt;p&gt;}&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;While compiling the code, getting the following error:&lt;\/p&gt;&lt;p&gt;==============================================================================&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;Node 0: Process 139300: Received signal SIGSEGV.&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;==============================================================================&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed: No such file or directory&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed: No such file or directory&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed: No such file or directory&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed: No such file or directory&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed: No such file or directory&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed: No such file or directory&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed: No such file or directory&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed: No such file or directory&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed: No such file or directory&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed: No such file or directory&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed: No such file or directory&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed: No such file or directory&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed: No such file or directory&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed: No such file or directory&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed: No such file or directory&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed: No such file or directory&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed: No such file or directory&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed: No such file or directory&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed: No such file or directory&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed: No such file or directory&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed: No such file or directory&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed: No such file or directory&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed: No such file or directory&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed: No such file or directory&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed: No such file or directory&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;999999: mpt_accept: error: accept failed:&lt;\/p&gt;&lt;p&gt;===================================================================================&lt;\/p&gt;&lt;p&gt;= BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES&lt;\/p&gt;&lt;p&gt;= RANK 0 PID 139300 RUNNING AT CNA309-6LJDRZ2&lt;\/p&gt;&lt;p&gt;= EXIT STATUS: -1 (ffffffff)&lt;\/p&gt;&lt;p&gt;===================================================================================&lt;\/p&gt;&lt;p&gt;The fl process could not be started.&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;Also, after compiling the code, fluent is not allowed to initialize. See the below screenshot.&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/12-11-2024-1731380397-mceclip0.png\" \/>&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;If anyone can help to resolve the issue, that would be great.&lt;\/p&gt;&lt;p&gt;Thanks.&lt;\/p&gt;&lt;\/p&gt;&lt;\/p&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-393684","topic","type-topic","status-publish","hentry","topic-tag-multiphase_models-1","topic-tag-udf","topic-tag-vof"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I want to use temperature-dependent density for the gas phase (secondary phase) in my VOF multiphase model. The udf is as follows: #include &quot;udf.h&quot;#include &quot;math.h&quot;DEFINE_PROPERTY(cell_density,c,t){\/* Declare local variables *\/real g_density;real temp; \/* Retrieve temperature of phase 2 *\/Thread *phase_thread = THREAD_SUB_THREAD(t, 1);temp = C_T_M1(c, phase_thread); \/* Apply temperature-dependent density correlation *\/if (temp &gt; 273.0) g_density\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/udf-for-defining-density\/\" \/>\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=\"udf for defining density | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"I want to use temperature-dependent density for the gas phase (secondary phase) in my VOF multiphase model. The udf is as follows: #include &quot;udf.h&quot;#include &quot;math.h&quot;DEFINE_PROPERTY(cell_density,c,t){\/* Declare local variables *\/real g_density;real temp; \/* Retrieve temperature of phase 2 *\/Thread *phase_thread = THREAD_SUB_THREAD(t, 1);temp = C_T_M1(c, phase_thread); \/* Apply temperature-dependent density correlation *\/if (temp &gt; 273.0) g_density\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/udf-for-defining-density\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-11-12T03:01:11+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-11-12T03:24:58+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"udf for defining density | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"I want to use temperature-dependent density for the gas phase (secondary phase) in my VOF multiphase model. The udf is as follows: #include &quot;udf.h&quot;#include &quot;math.h&quot;DEFINE_PROPERTY(cell_density,c,t){\/* Declare local variables *\/real g_density;real temp; \/* Retrieve temperature of phase 2 *\/Thread *phase_thread = THREAD_SUB_THREAD(t, 1);temp = C_T_M1(c, phase_thread); \/* Apply temperature-dependent density correlation *\/if (temp &gt; 273.0) g_density\" \/>\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\\\/udf-for-defining-density\\\/#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\\\/udf\\\/#listItem\",\"name\":\"udf\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/udf\\\/#listItem\",\"position\":3,\"name\":\"udf\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/udf\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/udf-for-defining-density\\\/#listItem\",\"name\":\"udf for defining density\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/udf-for-defining-density\\\/#listItem\",\"position\":4,\"name\":\"udf for defining density\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/udf\\\/#listItem\",\"name\":\"udf\"}}]},{\"@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\\\/udf-for-defining-density\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/udf-for-defining-density\\\/\",\"name\":\"udf for defining density | Ansys Learning Forum\",\"description\":\"I want to use temperature-dependent density for the gas phase (secondary phase) in my VOF multiphase model. 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The udf is as follows: #include &quot;udf.h&quot;#include &quot;math.h&quot;DEFINE_PROPERTY(cell_density,c,t){\/* Declare local variables *\/real g_density;real temp; \/* Retrieve temperature of phase 2 *\/Thread *phase_thread = THREAD_SUB_THREAD(t, 1);temp = C_T_M1(c, phase_thread); \/* Apply temperature-dependent density correlation *\/if (temp &gt; 273.0) g_density"},"aioseo_meta_data":{"post_id":"393684","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 09:06:47","updated":"2025-10-19 09:06:47","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\/udf\/\" title=\"udf\">udf<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tudf for defining density\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":"udf","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/udf\/"},{"label":"udf for defining density","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/udf-for-defining-density\/"}],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":["134.148.188.0"],"_btv_view_count":["1087"],"_bbp_topic_status":["unanswered"],"_edit_last":["174262"],"_bbp_revision_log":["a:3:{i:393685;a:2:{s:6:\"author\";i:174262;s:6:\"reason\";s:0:\"\";}i:393687;a:2:{s:6:\"author\";i:174262;s:6:\"reason\";s:0:\"\";}i:393691;a:2:{s:6:\"author\";i:174262;s:6:\"reason\";s:0:\"\";}}"],"_bbp_subscription":["174262","199","437146"],"_bbp_topic_id":["393684"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","174262","437146"],"_bbp_voice_count":["3"],"_bbp_reply_count":["6"],"_bbp_last_reply_id":["393870"],"_bbp_last_active_id":["393870"],"_bbp_last_active_time":["2024-11-12 17:09:31"]},"test":"mathru"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/393684","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":3,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/393684\/revisions"}],"predecessor-version":[{"id":393691,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/393684\/revisions\/393691"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=393684"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}