{"id":161842,"date":"2023-01-25T07:17:08","date_gmt":"2023-01-25T07:17:08","guid":{"rendered":"\/knowledge\/forums\/topic\/i-have-an-eulerian-phase-change-problem-set-up-and-i-am-having-trouble-hooking-a-mass-transfer-udf-once-my-udf-is-compiled-and-loaded-i-proceed-to-the-eulerian-phase-interaction-pane-this-produc\/"},"modified":"2023-07-31T12:35:59","modified_gmt":"2023-07-31T12:35:59","slug":"i-have-an-eulerian-phase-change-problem-set-up-and-i-am-having-trouble-hooking-a-mass-transfer-udf-once-my-udf-is-compiled-and-loaded-i-proceed-to-the-eulerian-phase-interaction-pane-this-produc","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/i-have-an-eulerian-phase-change-problem-set-up-and-i-am-having-trouble-hooking-a-mass-transfer-udf-once-my-udf-is-compiled-and-loaded-i-proceed-to-the-eulerian-phase-interaction-pane-this-produc\/","title":{"rendered":"I have an Eulerian phase change problem set up and I am having trouble hooking a mass transfer UDF.  Once my UDF is compiled and loaded., I proceed to the Eulerian Phase Interaction pane.  This produces the following warning message:  Warning:  1. In Heat Transfer models, fixed-to-sat-temp should only be selected when mass transfer occurs. The To-Phase temperature equals to the saturation temperature.  2. For Evaporation-Condensation, with Two-Resistance heat transfer, Thermal Phase Change model is used; Otherwise, Lee model is applied.  3. For user-defined mass transfer, Linearized-Mass-Transfer UDF is on. If needed, use &#8216;solve\/set\/expert&#8217; to switch to Mass-Transfer UDF.  Even after making the required change in the TUI, The UDF will not hook and the attempt to use the user-defined Mass Transfer  option results it the error:   &#8220;No user-defined functions have been loaded.&#8221; even though the UDF is loaded. How can I get around this?"},"content":{"rendered":"<p>There is a defect that effects releases up to and including V 18.0 that require the existing mass transfer relationship to be completely disabled and then re-established before the UDF can be hooked. To do this, set the mass transfer relationship from its previous value to &#8220;None&#8221; and reduce the number of mass transfer mechanisms to 0. Then add a new mass transfer mechanism and set the mass transfer relationship to &#8220;user-defined&#8221;.  UDF will now hook.<\/p>\n","protected":false},"template":"","class_list":["post-161842","topic","type-topic","status-publish","hentry","topic-tag-4422","topic-tag-fluent","topic-tag-fluid-dynamics","topic-tag-mp-eulerian-mp-flow","topic-tag-multiphase","topic-tag-scripting-journaling-udf"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"There is a defect that effects releases up to and including V 18.0 that require the existing mass transfer relationship to be completely disabled and then re-established before the UDF can be hooked. To do this, set the mass transfer relationship from its previous value to &quot;None&quot; and reduce the number of mass transfer mechanisms\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/i-have-an-eulerian-phase-change-problem-set-up-and-i-am-having-trouble-hooking-a-mass-transfer-udf-once-my-udf-is-compiled-and-loaded-i-proceed-to-the-eulerian-phase-interaction-pane-this-produc\/\" \/>\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 Knowledge | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"I have an Eulerian phase change problem set up and I am having trouble hooking a mass transfer UDF. Once my UDF is compiled and loaded., I proceed to the Eulerian Phase Interaction pane. This produces the following warning message: Warning: 1. In Heat Transfer models, fixed-to-sat-temp should only be selected when mass transfer occurs. The To-Phase temperature equals to the saturation temperature. 2. For Evaporation-Condensation, with Two-Resistance heat transfer, Thermal Phase Change model is used; Otherwise, Lee model is applied. 3. For user-defined mass transfer, Linearized-Mass-Transfer UDF is on. If needed, use \u2018solve\/set\/expert\u2019 to switch to Mass-Transfer UDF. Even after making the required change in the TUI, The UDF will not hook and the attempt to use the user-defined Mass Transfer option results it the error: \u201cNo user-defined functions have been loaded.\u201d even though the UDF is loaded. How can I get around this? | Ansys Knowledge\" \/>\n\t\t<meta property=\"og:description\" content=\"There is a defect that effects releases up to and including V 18.0 that require the existing mass transfer relationship to be completely disabled and then re-established before the UDF can be hooked. To do this, set the mass transfer relationship from its previous value to &quot;None&quot; and reduce the number of mass transfer mechanisms\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/i-have-an-eulerian-phase-change-problem-set-up-and-i-am-having-trouble-hooking-a-mass-transfer-udf-once-my-udf-is-compiled-and-loaded-i-proceed-to-the-eulerian-phase-interaction-pane-this-produc\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2023-01-25T07:17:08+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2023-07-31T12:35:59+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"I have an Eulerian phase change problem set up and I am having trouble hooking a mass transfer UDF. Once my UDF is compiled and loaded., I proceed to the Eulerian Phase Interaction pane. This produces the following warning message: Warning: 1. In Heat Transfer models, fixed-to-sat-temp should only be selected when mass transfer occurs. The To-Phase temperature equals to the saturation temperature. 2. For Evaporation-Condensation, with Two-Resistance heat transfer, Thermal Phase Change model is used; Otherwise, Lee model is applied. 3. For user-defined mass transfer, Linearized-Mass-Transfer UDF is on. If needed, use \u2018solve\/set\/expert\u2019 to switch to Mass-Transfer UDF. Even after making the required change in the TUI, The UDF will not hook and the attempt to use the user-defined Mass Transfer option results it the error: \u201cNo user-defined functions have been loaded.\u201d even though the UDF is loaded. How can I get around this? | Ansys Knowledge\" \/>\n\t\t<meta name=\"twitter:description\" content=\"There is a defect that effects releases up to and including V 18.0 that require the existing mass transfer relationship to be completely disabled and then re-established before the UDF can be hooked. To do this, set the mass transfer relationship from its previous value to &quot;None&quot; and reduce the number of mass transfer mechanisms\" \/>\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\\\/knowledge\\\/forums\\\/topic\\\/i-have-an-eulerian-phase-change-problem-set-up-and-i-am-having-trouble-hooking-a-mass-transfer-udf-once-my-udf-is-compiled-and-loaded-i-proceed-to-the-eulerian-phase-interaction-pane-this-produc\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/fluent\\\/#listItem\",\"name\":\"fluent\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/fluent\\\/#listItem\",\"position\":3,\"name\":\"fluent\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/fluent\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/i-have-an-eulerian-phase-change-problem-set-up-and-i-am-having-trouble-hooking-a-mass-transfer-udf-once-my-udf-is-compiled-and-loaded-i-proceed-to-the-eulerian-phase-interaction-pane-this-produc\\\/#listItem\",\"name\":\"I have an Eulerian phase change problem set up and I am having trouble hooking a mass transfer UDF.  Once my UDF is compiled and loaded., I proceed to the Eulerian Phase Interaction pane.  This produces the following warning message:  Warning:  1. In Heat Transfer models, fixed-to-sat-temp should only be selected when mass transfer occurs. The To-Phase temperature equals to the saturation temperature.  2. For Evaporation-Condensation, with Two-Resistance heat transfer, Thermal Phase Change model is used; Otherwise, Lee model is applied.  3. For user-defined mass transfer, Linearized-Mass-Transfer UDF is on. If needed, use &#8216;solve\\\/set\\\/expert&#8217; to switch to Mass-Transfer UDF.  Even after making the required change in the TUI, The UDF will not hook and the attempt to use the user-defined Mass Transfer  option results it the error:   &#8220;No user-defined functions have been loaded.&#8221; even though the UDF is loaded. 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For Evaporation-Condensation, with Two-Resistance heat transfer, Thermal Phase Change model is used; Otherwise, Lee model is applied.  3. For user-defined mass transfer, Linearized-Mass-Transfer UDF is on. If needed, use &#8216;solve\\\/set\\\/expert&#8217; to switch to Mass-Transfer UDF.  Even after making the required change in the TUI, The UDF will not hook and the attempt to use the user-defined Mass Transfer  option results it the error:   &#8220;No user-defined functions have been loaded.&#8221; even though the UDF is loaded. 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Once my UDF is compiled and loaded., I proceed to the Eulerian Phase Interaction pane. This produces the following warning message: Warning: 1. In Heat Transfer models, fixed-to-sat-temp should only be selected when mass transfer occurs. The To-Phase temperature equals to the saturation temperature. 2. For Evaporation-Condensation, with Two-Resistance heat transfer, Thermal Phase Change model is used; Otherwise, Lee model is applied. 3. For user-defined mass transfer, Linearized-Mass-Transfer UDF is on. If needed, use \\u2018solve\\\/set\\\/expert\\u2019 to switch to Mass-Transfer UDF. Even after making the required change in the TUI, The UDF will not hook and the attempt to use the user-defined Mass Transfer option results it the error: \\u201cNo user-defined functions have been loaded.\\u201d even though the UDF is loaded. How can I get around this? | Ansys Knowledge\",\"description\":\"There is a defect that effects releases up to and including V 18.0 that require the existing mass transfer relationship to be completely disabled and then re-established before the UDF can be hooked. 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Once my UDF is compiled and loaded., I proceed to the Eulerian Phase Interaction pane. This produces the following warning message: Warning: 1. In Heat Transfer models, fixed-to-sat-temp should only be selected when mass transfer occurs. The To-Phase temperature equals to the saturation temperature. 2. For Evaporation-Condensation, with Two-Resistance heat transfer, Thermal Phase Change model is used; Otherwise, Lee model is applied. 3. For user-defined mass transfer, Linearized-Mass-Transfer UDF is on. If needed, use \u2018solve\/set\/expert\u2019 to switch to Mass-Transfer UDF. Even after making the required change in the TUI, The UDF will not hook and the attempt to use the user-defined Mass Transfer option results it the error: \u201cNo user-defined functions have been loaded.\u201d even though the UDF is loaded. How can I get around this? | Ansys Knowledge","description":"There is a defect that effects releases up to and including V 18.0 that require the existing mass transfer relationship to be completely disabled and then re-established before the UDF can be hooked. To do this, set the mass transfer relationship from its previous value to \"None\" and reduce the number of mass transfer mechanisms","canonical_url":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/i-have-an-eulerian-phase-change-problem-set-up-and-i-am-having-trouble-hooking-a-mass-transfer-udf-once-my-udf-is-compiled-and-loaded-i-proceed-to-the-eulerian-phase-interaction-pane-this-produc\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/i-have-an-eulerian-phase-change-problem-set-up-and-i-am-having-trouble-hooking-a-mass-transfer-udf-once-my-udf-is-compiled-and-loaded-i-proceed-to-the-eulerian-phase-interaction-pane-this-produc\/#breadcrumblist","itemListElement":[{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge#listItem","position":1,"name":"Home","item":"https:\/\/innovationspace.ansys.com\/knowledge","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/#listItem","name":"Topics"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/#listItem","position":2,"name":"Topics","item":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/fluent\/#listItem","name":"fluent"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge#listItem","name":"Home"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/fluent\/#listItem","position":3,"name":"fluent","item":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/fluent\/","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/i-have-an-eulerian-phase-change-problem-set-up-and-i-am-having-trouble-hooking-a-mass-transfer-udf-once-my-udf-is-compiled-and-loaded-i-proceed-to-the-eulerian-phase-interaction-pane-this-produc\/#listItem","name":"I have an Eulerian phase change problem set up and I am having trouble hooking a mass transfer UDF.  Once my UDF is compiled and loaded., I proceed to the Eulerian Phase Interaction pane.  This produces the following warning message:  Warning:  1. In Heat Transfer models, fixed-to-sat-temp should only be selected when mass transfer occurs. The To-Phase temperature equals to the saturation temperature.  2. For Evaporation-Condensation, with Two-Resistance heat transfer, Thermal Phase Change model is used; Otherwise, Lee model is applied.  3. For user-defined mass transfer, Linearized-Mass-Transfer UDF is on. If needed, use &#8216;solve\/set\/expert&#8217; to switch to Mass-Transfer UDF.  Even after making the required change in the TUI, The UDF will not hook and the attempt to use the user-defined Mass Transfer  option results it the error:   &#8220;No user-defined functions have been loaded.&#8221; even though the UDF is loaded. How can I get around this?"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/#listItem","name":"Topics"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/i-have-an-eulerian-phase-change-problem-set-up-and-i-am-having-trouble-hooking-a-mass-transfer-udf-once-my-udf-is-compiled-and-loaded-i-proceed-to-the-eulerian-phase-interaction-pane-this-produc\/#listItem","position":4,"name":"I have an Eulerian phase change problem set up and I am having trouble hooking a mass transfer UDF.  Once my UDF is compiled and loaded., I proceed to the Eulerian Phase Interaction pane.  This produces the following warning message:  Warning:  1. In Heat Transfer models, fixed-to-sat-temp should only be selected when mass transfer occurs. The To-Phase temperature equals to the saturation temperature.  2. For Evaporation-Condensation, with Two-Resistance heat transfer, Thermal Phase Change model is used; Otherwise, Lee model is applied.  3. For user-defined mass transfer, Linearized-Mass-Transfer UDF is on. If needed, use &#8216;solve\/set\/expert&#8217; to switch to Mass-Transfer UDF.  Even after making the required change in the TUI, The UDF will not hook and the attempt to use the user-defined Mass Transfer  option results it the error:   &#8220;No user-defined functions have been loaded.&#8221; even though the UDF is loaded. How can I get around this?","previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/fluent\/#listItem","name":"fluent"}}]},{"@type":"Organization","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/#organization","name":"Ansys Knowledge","description":"Ansys Innovation Space","url":"https:\/\/innovationspace.ansys.com\/knowledge\/"},{"@type":"WebPage","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/i-have-an-eulerian-phase-change-problem-set-up-and-i-am-having-trouble-hooking-a-mass-transfer-udf-once-my-udf-is-compiled-and-loaded-i-proceed-to-the-eulerian-phase-interaction-pane-this-produc\/#webpage","url":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/i-have-an-eulerian-phase-change-problem-set-up-and-i-am-having-trouble-hooking-a-mass-transfer-udf-once-my-udf-is-compiled-and-loaded-i-proceed-to-the-eulerian-phase-interaction-pane-this-produc\/","name":"I have an Eulerian phase change problem set up and I am having trouble hooking a mass transfer UDF. Once my UDF is compiled and loaded., I proceed to the Eulerian Phase Interaction pane. This produces the following warning message: Warning: 1. In Heat Transfer models, fixed-to-sat-temp should only be selected when mass transfer occurs. The To-Phase temperature equals to the saturation temperature. 2. For Evaporation-Condensation, with Two-Resistance heat transfer, Thermal Phase Change model is used; Otherwise, Lee model is applied. 3. For user-defined mass transfer, Linearized-Mass-Transfer UDF is on. If needed, use \u2018solve\/set\/expert\u2019 to switch to Mass-Transfer UDF. Even after making the required change in the TUI, The UDF will not hook and the attempt to use the user-defined Mass Transfer option results it the error: \u201cNo user-defined functions have been loaded.\u201d even though the UDF is loaded. How can I get around this? | Ansys Knowledge","description":"There is a defect that effects releases up to and including V 18.0 that require the existing mass transfer relationship to be completely disabled and then re-established before the UDF can be hooked. To do this, set the mass transfer relationship from its previous value to \"None\" and reduce the number of mass transfer mechanisms","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/innovationspace.ansys.com\/knowledge\/#website"},"breadcrumb":{"@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/i-have-an-eulerian-phase-change-problem-set-up-and-i-am-having-trouble-hooking-a-mass-transfer-udf-once-my-udf-is-compiled-and-loaded-i-proceed-to-the-eulerian-phase-interaction-pane-this-produc\/#breadcrumblist"},"datePublished":"2023-01-25T07:17:08+00:00","dateModified":"2023-07-31T12:35:59+00:00"},{"@type":"WebSite","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/#website","url":"https:\/\/innovationspace.ansys.com\/knowledge\/","name":"Ansys Knowledge","description":"Ansys Innovation Space","inLanguage":"en-US","publisher":{"@id":"https:\/\/innovationspace.ansys.com\/knowledge\/#organization"}}]},"og:locale":"en_US","og:site_name":"Ansys Knowledge | Ansys Innovation Space","og:type":"article","og:title":"I have an Eulerian phase change problem set up and I am having trouble hooking a mass transfer UDF. Once my UDF is compiled and loaded., I proceed to the Eulerian Phase Interaction pane. This produces the following warning message: Warning: 1. In Heat Transfer models, fixed-to-sat-temp should only be selected when mass transfer occurs. The To-Phase temperature equals to the saturation temperature. 2. For Evaporation-Condensation, with Two-Resistance heat transfer, Thermal Phase Change model is used; Otherwise, Lee model is applied. 3. For user-defined mass transfer, Linearized-Mass-Transfer UDF is on. If needed, use \u2018solve\/set\/expert\u2019 to switch to Mass-Transfer UDF. Even after making the required change in the TUI, The UDF will not hook and the attempt to use the user-defined Mass Transfer option results it the error: \u201cNo user-defined functions have been loaded.\u201d even though the UDF is loaded. How can I get around this? | Ansys Knowledge","og:description":"There is a defect that effects releases up to and including V 18.0 that require the existing mass transfer relationship to be completely disabled and then re-established before the UDF can be hooked. To do this, set the mass transfer relationship from its previous value to &quot;None&quot; and reduce the number of mass transfer mechanisms","og:url":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/i-have-an-eulerian-phase-change-problem-set-up-and-i-am-having-trouble-hooking-a-mass-transfer-udf-once-my-udf-is-compiled-and-loaded-i-proceed-to-the-eulerian-phase-interaction-pane-this-produc\/","article:published_time":"2023-01-25T07:17:08+00:00","article:modified_time":"2023-07-31T12:35:59+00:00","twitter:card":"summary_large_image","twitter:title":"I have an Eulerian phase change problem set up and I am having trouble hooking a mass transfer UDF. Once my UDF is compiled and loaded., I proceed to the Eulerian Phase Interaction pane. This produces the following warning message: Warning: 1. In Heat Transfer models, fixed-to-sat-temp should only be selected when mass transfer occurs. The To-Phase temperature equals to the saturation temperature. 2. For Evaporation-Condensation, with Two-Resistance heat transfer, Thermal Phase Change model is used; Otherwise, Lee model is applied. 3. For user-defined mass transfer, Linearized-Mass-Transfer UDF is on. If needed, use \u2018solve\/set\/expert\u2019 to switch to Mass-Transfer UDF. Even after making the required change in the TUI, The UDF will not hook and the attempt to use the user-defined Mass Transfer option results it the error: \u201cNo user-defined functions have been loaded.\u201d even though the UDF is loaded. How can I get around this? | Ansys Knowledge","twitter:description":"There is a defect that effects releases up to and including V 18.0 that require the existing mass transfer relationship to be completely disabled and then re-established before the UDF can be hooked. To do this, set the mass transfer relationship from its previous value to &quot;None&quot; and reduce the number of mass transfer mechanisms"},"aioseo_meta_data":{"post_id":"161842","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":"2025-10-17 19:26:44","updated":"2026-07-29 06:20:30","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\/knowledge\" 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\/knowledge\/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\/knowledge\/forums\/topic-tag\/fluent\/\" title=\"fluent\">fluent<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tI have an Eulerian phase change problem set up and I am having trouble hooking a mass transfer UDF.  Once my UDF is compiled and loaded., I proceed to the Eulerian Phase Interaction pane.  This produces the following warning message:  Warning:  1. In Heat Transfer models, fixed-to-sat-temp should only be selected when mass transfer occurs. The To-Phase temperature equals to the saturation temperature.  2. For Evaporation-Condensation, with Two-Resistance heat transfer, Thermal Phase Change model is used; Otherwise, Lee model is applied.  3. For user-defined mass transfer, Linearized-Mass-Transfer UDF is on. If needed, use \u2018solve\/set\/expert\u2019 to switch to Mass-Transfer UDF.  Even after making the required change in the TUI, The UDF will not hook and the attempt to use the user-defined Mass Transfer  option results it the error:   \u201cNo user-defined functions have been loaded.\u201d even though the UDF is loaded. How can I get around this?\n\t\t<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/innovationspace.ansys.com\/knowledge"},{"label":"Topics","link":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/"},{"label":"fluent","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/fluent\/"},{"label":"I have an Eulerian phase change problem set up and I am having trouble hooking a mass transfer UDF.  Once my UDF is compiled and loaded., I proceed to the Eulerian Phase Interaction pane.  This produces the following warning message:  Warning:  1. In Heat Transfer models, fixed-to-sat-temp should only be selected when mass transfer occurs. The To-Phase temperature equals to the saturation temperature.  2. For Evaporation-Condensation, with Two-Resistance heat transfer, Thermal Phase Change model is used; Otherwise, Lee model is applied.  3. For user-defined mass transfer, Linearized-Mass-Transfer UDF is on. If needed, use &#8216;solve\/set\/expert&#8217; to switch to Mass-Transfer UDF.  Even after making the required change in the TUI, The UDF will not hook and the attempt to use the user-defined Mass Transfer  option results it the error:   &#8220;No user-defined functions have been loaded.&#8221; even though the UDF is loaded. How can I get around this?","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/i-have-an-eulerian-phase-change-problem-set-up-and-i-am-having-trouble-hooking-a-mass-transfer-udf-once-my-udf-is-compiled-and-loaded-i-proceed-to-the-eulerian-phase-interaction-pane-this-produc\/"}],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_forum_id":["27809"],"_bbp_author_ip":["23.56.168.180"],"_bbp_last_active_time":["1-24-2023  20:20:06"],"_btv_view_count":["1668"],"siebel_km_number":["2048546"],"product_version":["18"],"km_published_date":["2017-03-01T15:52:59.000Z"],"family":["Fluid Dynamics"],"application_name":["FLUENT"]},"test":"articlesansys-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/161842","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/161842\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=161842"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}