{"id":288373,"date":"2023-06-13T05:49:13","date_gmt":"2023-06-13T05:49:13","guid":{"rendered":"\/forum\/forums\/topic\/coupled-population-balance-and-wall-boiling-model-for-subcooled-flow-boiling\/"},"modified":"2023-06-13T05:49:13","modified_gmt":"2023-06-13T05:49:13","slug":"coupled-population-balance-and-wall-boiling-model-for-subcooled-flow-boiling","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/coupled-population-balance-and-wall-boiling-model-for-subcooled-flow-boiling\/","title":{"rendered":"Coupled population balance and wall boiling model for subcooled flow boiling"},"content":{"rendered":"<p>I am simulating subcooled water flow boiling in annulus geometry. The experimental case considered for validation has high void fraction flow regimes i.e. slug regime (up to area-averaged void fraction of 60 %). So flow regime-dependent closure correlations are used within AIAD framework using UDFs.&nbsp; I am using <span style=\"font-size: 14pt\">Ansys Fluent 2023 student version. <\/span><\/p>\n<p><span style=\"font-size: 14pt\">W<\/span><span style=\"font-size: 14pt\">hen I am enabling the population balance model and performing the run the cases are diverging. I made interfacial heat transfer liquid side default model (Ranz-Marshall) without UDF and Drag, Interfacial area as UDFs. Then it is running without any divergence. But I am unable to use UDF for interfacial heat transfer liquid side.&nbsp;<\/span><\/p>\n<p><span style=\"font-size: 14pt\">Is it any bug there? With Ranz-Marshall udf also, the case is diverging when enabling the coupling of wall boiling and population balance model.<\/span><\/p>\n<p><span style=\"font-size: 14pt\">Thanks and regards,<\/span><\/p>\n<p><span style=\"font-size: 14pt\">Sachin&nbsp; &nbsp; &nbsp;&nbsp;<\/span><\/p>\n","protected":false},"template":"","class_list":["post-288373","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I am simulating subcooled water flow boiling in annulus geometry. The experimental case considered for validation has high void fraction flow regimes i.e. slug regime (up to area-averaged void fraction of 60 %). So flow regime-dependent closure correlations are used within AIAD framework using UDFs. I am using Ansys Fluent 2023 student version. 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