{"id":388551,"date":"2024-10-08T13:39:29","date_gmt":"2024-10-08T13:39:29","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/udf-file-for-heat-source-about-solar-ray-tracing\/"},"modified":"2024-10-08T13:39:29","modified_gmt":"2024-10-08T13:39:29","slug":"udf-file-for-heat-source-about-solar-ray-tracing","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/udf-file-for-heat-source-about-solar-ray-tracing\/","title":{"rendered":"UDF File for heat source about solar ray tracing"},"content":{"rendered":"<p>&lt;p&gt;Hi everyone,&lt;\/p&gt;&lt;p&gt;I am trying to model a floating solar pv in fluent by using the Volume of Fluid method. I am using the solar ray tracing to add the solar irradiance from a specific location. The problem that i am facing is that i want to create a udf file that has as an input value the calculated solar irradiance from the solar caclulator and not a specific value that i could assume. Previously i created a udf file for the heat source by assuming a constant value for the solar irradiation and it was working very well. By searching the manuals of the software i found out that i can store the values of&nbsp;&lt;\/p&gt;<\/p>\n<ul>\n<li>Direct Normal Solar Irradiation<\/li>\n<li>Diffuse Solar Irradiation &#8211; Vertical Surface<\/li>\n<li>Diffuse Solar Irradiation &#8211; Horizontal Surface<\/li>\n<li>Ground Reflected Solar Irradiation &#8211; Vertical Surface&nbsp;&nbsp;<\/li>\n<\/ul>\n<p>&lt;p&gt;In UDMI Storage. I can not find the command that calls the calculated values from the software to the udf file. I am sending you also my code. The reason that i want the specific values of solar irradiation is that after that i want to use the code for a transient simulation. If anybody can help me about this issue i will be very thankfull. Thank you very much.&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;#include &#8220;udf.h&#8221;&lt;\/p&gt;&lt;p&gt;\/* Define solar irradiation parameters *\/&lt;br&gt;#define SOLAR_IRRADIANCE 800.0 &nbsp;\/* Solar radiation in W\/m&sup2; *\/&lt;br&gt;#define BASE_EFFICIENCY 0.18 &nbsp; &nbsp; \/* Baseline efficiency of PV conversion *\/&lt;\/p&gt;&lt;p&gt;\/* UDF to calculate heat generation considering temperature-dependent PV efficiency *\/&lt;br&gt;DEFINE_SOURCE(heat_source_solar, cell, thread, dS, eqn)&lt;br&gt;{&lt;br&gt;&nbsp; &nbsp; real heat_source_value;&lt;br&gt;&nbsp; &nbsp; real cell_volume;&lt;br&gt;&nbsp; &nbsp; real cell_temperature;&lt;br&gt;&nbsp; &nbsp; real efficiency;&lt;br&gt;&nbsp; &nbsp; real absorptivity = 0.8; &nbsp;\/* Absorptivity assumed constant here *\/&lt;br&gt;&nbsp; &nbsp;&nbsp;&lt;br&gt;&nbsp; &nbsp; \/* Get the cell temperature *\/&lt;br&gt;&nbsp; &nbsp; cell_temperature = C_T(cell, thread);&lt;br&gt;&nbsp; &nbsp;&nbsp;&lt;br&gt;&nbsp; &nbsp; \/* Define a temperature-dependent efficiency:&nbsp;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp;Efficiency decreases as temperature increases *\/&lt;br&gt;&nbsp; &nbsp; if (cell_temperature &lt; 298.15)&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; efficiency = BASE_EFFICIENCY; &nbsp;\/* Base efficiency *\/&lt;br&gt;&nbsp; &nbsp; else&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; efficiency = BASE_EFFICIENCY &#8211; 0.0004 * (cell_temperature &#8211; 298.15); &nbsp;\/* Linear decrease in efficiency *\/&lt;br&gt;&nbsp; &nbsp;&nbsp;&lt;br&gt;&nbsp; &nbsp; \/* Ensure efficiency does not go below zero *\/&lt;br&gt;&nbsp; &nbsp; if (efficiency &lt; 0.0)&nbsp;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; efficiency = 0.0;&lt;br&gt;&nbsp; &nbsp;&nbsp;&lt;br&gt;&nbsp; &nbsp; \/* Calculate the heat generation from absorbed solar radiation *\/&lt;br&gt;&nbsp; &nbsp; cell_volume = C_VOLUME(cell, thread); \/* Get the volume of the current cell *\/&lt;br&gt;&nbsp; &nbsp;&nbsp;&lt;br&gt;&nbsp; &nbsp; \/* Fraction of absorbed radiation converted to heat:&nbsp;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp;(1 &#8211; efficiency) * absorptivity * solar irradiance *\/&lt;br&gt;&nbsp; &nbsp; heat_source_value = (1.0 &#8211; efficiency) * absorptivity * SOLAR_IRRADIANCE\/0.0046;&lt;\/p&gt;&lt;p&gt;&nbsp; &nbsp; \/* Apply the source term to the energy equation *\/&lt;br&gt;&nbsp; &nbsp; dS[eqn] = 0.0; &nbsp;\/* Derivative of source term with respect to temperature (optional) *\/&lt;br&gt;&nbsp; &nbsp; return heat_source_value; &nbsp;\/* Return the heat source value *\/&lt;br&gt;}&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-388551","topic","type-topic","status-publish","hentry","topic-tag-cfd-udf-fleunt","topic-tag-solar-load","topic-tag-solar-loading-2","topic-tag-solar-ray-tracing-2"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi everyone,I am trying to model a floating solar pv in fluent by using the Volume of Fluid method. 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