{"id":160580,"date":"2021-07-21T17:25:09","date_gmt":"2021-07-21T17:25:09","guid":{"rendered":"\/forum\/forums\/topic\/droplet-evaporation-mass-as-source-udf\/"},"modified":"2021-07-21T18:29:21","modified_gmt":"2021-07-21T18:29:21","slug":"droplet-evaporation-mass-as-source-udf","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/droplet-evaporation-mass-as-source-udf\/","title":{"rendered":"Droplet Evaporation Mass as Source UDF"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>Hello All,<\/p>\n<p>I am trying to simulate a large scale bulk spray cooling system. In my case:<\/p>\n<ul>\n<li>There is a primary phase accounting for air + vapor (mixture).<\/li>\n<li>There is a secondary phase accounting for condensed water.<\/li>\n<li>The saturation is controlled according to Antoine Eqn. and mass transfer between phases is according to Lee&#039;s model. <\/li>\n<li>There is a DPM phase (water) sprayed as injections.<\/li>\n<li>I am using steady state, mixture model with DPM on. <\/li>\n<\/ul>\n<p>Here is the catch, when droplets evaporate the model diverges at some point. <\/p>\n<p>When I limit the vaporization and go inert, I get the steady state results fine by dropping the dew point down, condensing vapor as I want but, I would like to capture the droplet evaporation at the same time. In our discussions we thought that this might be due to the &#039;source problem&#039; as the eulerian continuity won&#039;t recognize the mass source from DPM unless we state it in the cell zone conditions. (Is this a correct point? You may interrupt here and think the problem could be elsewhere, please let me know if so.)<\/p>\n<p>Accordingly, I have tried to write a UDF code to extract the evaporated mass information so that I would feed that as the mass source to my continuous phase. I am thinking:<\/p>\n<ul>\n<li>Getting a list of injections<\/li>\n<li>Looping over particles of that injection for the current solution<\/li>\n<li>Summing an overall mass flow of the remaining DPM mass<\/li>\n<li>Subtracting that value from my initial injection mass and find out evaporated mass.<\/li>\n<li>Then return that mass to the DEFINE_SOURCE macro so it is visible under Fluent. <\/li>\n<\/ul>\n<p>However, so far, I couldn&#039;t make it work. <\/p>\n<p>Following code compiles but gives an error message saying &#039;empty value&#039;.<\/p>\n<p>I know you guys won&#039;t debug codes but, I would definitely appreciate some support here.. If there is another way to do this, I am open for that option too.<\/p>\n<p>Thank you very much!<\/p>\n<p>Here is my UDF:<\/p>\n<p><\/p>\n<\/p>\n<p>#include &quot;udf.h&quot;<\/p>\n<p>#include &quot;dpm.h&quot;<\/p>\n<p>#define injectionmass 10 <em>\/\/ initial total injection mass in kg per second<\/em><\/p>\n<p>DEFINE_SOURCE(vaporization_mass,c,t,dS,eqn)<\/p>\n<p>{<\/p>\n<p>real mpdot;<\/p>\n<p>real mass;<\/p>\n<p>Particle *p;<\/p>\n<p>Injection *I;<\/p>\n<p>Injection *Ilist = Get_dpm_injections();<\/p>\n<p>loop(I, Ilist)<\/p>\n<p>{<\/p>\n<p> loop(p, I-&gt;p)<\/p>\n<p>{<\/p>\n<p> c = P_CELL(p);<\/p>\n<p> t = P_CELL_THREAD(p);<\/p>\n<p> C_UDMI(c,t,0) += P_FLOW_RATE(p);<\/p>\n<p>}<\/p>\n<p>}<\/p>\n<p>mass = C_UDMI(c,t,0);<\/p>\n<p>mpdot = injectionmass &#8211; mass;<\/p>\n<p>return mpdot;<\/p>\n<p>}<\/p>\n","protected":false},"template":"","class_list":["post-160580","topic","type-topic","status-closed","hentry","topic-tag-multiphase-udf-evaporation-dpm-speciestransport-definesource-sourceterm-eulerian-lagrangian-1"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello All,I am trying to simulate a large scale bulk spray cooling system. In my case:There is a primary phase accounting for air + vapor (mixture).There is a secondary phase accounting for condensed water.The saturation is controlled according to Antoine Eqn. and mass transfer between phases is according to Lee&#039;s model. There is a DPM\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/droplet-evaporation-mass-as-source-udf\/\" \/>\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=\"Droplet Evaporation Mass as Source UDF | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hello All,I am trying to simulate a large scale bulk spray cooling system. In my case:There is a primary phase accounting for air + vapor (mixture).There is a secondary phase accounting for condensed water.The saturation is controlled according to Antoine Eqn. and mass transfer between phases is according to Lee&#039;s model. There is a DPM\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/droplet-evaporation-mass-as-source-udf\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2021-07-21T17:25:09+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2021-07-21T18:29:21+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Droplet Evaporation Mass as Source UDF | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Hello All,I am trying to simulate a large scale bulk spray cooling system. In my case:There is a primary phase accounting for air + vapor (mixture).There is a secondary phase accounting for condensed water.The saturation is controlled according to Antoine Eqn. and mass transfer between phases is according to Lee&#039;s model. 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