{"id":367437,"date":"2024-05-18T11:58:11","date_gmt":"2024-05-18T11:58:11","guid":{"rendered":"\/forum\/forums\/reply\/367437\/"},"modified":"2024-05-18T11:58:11","modified_gmt":"2024-05-18T11:58:11","slug":"367437","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/367437\/","title":{"rendered":"Reply To: Melting and solidification process for different boundary condition&amp; time period"},"content":{"rendered":"<p>&lt;p&gt;Sir, I wrote a UDF regarding the above-stated problem, which is given below,&lt;\/p&gt;&lt;p&gt;#include &#8220;udf.h&#8221;&lt;br&gt;real pcm_tavg;&lt;br&gt;real gc_tavg;&lt;\/p&gt;&lt;p&gt;#define T_S 494 &nbsp;\/*pcm solidus temperature*\/&lt;br&gt;#define T_L 514 &nbsp;\/*pcm liquidus temperature*\/&lt;br&gt;#define h 10 \/*heat transfer coefficient*\/&lt;br&gt;#define T_amb 300 \/*ambient temperature*\/&lt;\/p&gt;&lt;p&gt;\/* CALCULATING THE PCM DOMAIN VOLUME WEIGHTED AVERAGE TEMPERATURE*\/&lt;\/p&gt;&lt;p&gt;DEFINE_EXECUTE_AT_END(pcm_domain_average_temperature)&lt;br&gt;{&lt;br&gt;statement&lt;br&gt;&#8212;&#8212;&#8212;-&lt;br&gt;pcm_tavg = &#8212;&#8211;;&lt;br&gt;}&lt;\/p&gt;&lt;p&gt;\/* CALCULATING THE GLASS COVER AREA WEIGHTED AVERAGE TEMPERATURE*\/&lt;\/p&gt;&lt;p&gt;DEFINE_EXECUTE_AT_END(glass_cover_average_temperature)&lt;br&gt;{&lt;br&gt;statement&lt;br&gt;&#8212;&#8212;&#8212;-&lt;br&gt;gc_tavg = &#8212;&#8211;;&lt;br&gt;}&lt;\/p&gt;&lt;p&gt;\/* APPLYING CHARGING AND DIS-CHARGING BOUNDARY CONDITION *\/&lt;br&gt;&nbsp;&lt;br&gt;DEFINE_PROFILE(bound_condition,thread,position)&lt;br&gt;{&lt;br&gt;&nbsp; &nbsp; real x[ND_ND];&lt;br&gt;&nbsp; &nbsp; real current_time = CURRENT_TIME;&lt;br&gt;&nbsp; &nbsp; int current_time_step = N_TIME;&lt;br&gt;&nbsp; &nbsp; real current_time_step_size = CURRENT_TIMESTEP;&lt;br&gt;&nbsp; &nbsp; real total_time = current_time_step*current_time_step_size;&lt;br&gt;&nbsp; &nbsp; current_time=0;&lt;br&gt;&nbsp;#if !RP_HOST&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; face_t face;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; while(current_time&lt;=total_time)&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; {&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; begin_f_loop(face,thread)&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if(pcm_tavg&gt;=T_L)&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Message(&#8220;pcm completely melts, pcm_Tavg = %g\\n&#8221;,v_w_tavg);&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; while(current_time&lt;=total_time)&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; begin_f_loop(face,thread)&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;if(pcm_tavg&lt;=T_S)&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Message(&#8220;pcm completely solidifies, pcm_Tavg = %g\\n&#8221;,v_w_tavg);&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; break;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; } &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; else&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; F_CENTROID(x,face,thread);&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; F_PROFILE(face,thread,position) = h*(T_amb-gc_tavg);&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; end_f_loop(face,thread)&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;current_time = current_time + current_time_step_size;&nbsp;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; } &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; else&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; F_CENTROID(x,face,thread);&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; F_PROFILE(face,thread,position) = 20000;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; end_f_loop(face,thread)&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; current_time = current_time + current_time_step_size;&lt;br&gt;&nbsp; &nbsp; &nbsp; &nbsp; }&lt;br&gt;&nbsp; &nbsp; #endif &nbsp; &nbsp;&lt;br&gt;}&lt;\/p&gt;&lt;p&gt;First, I calculated the PCM domain volume-weighted average temperature and area-weighted average temperature for the glass cover outer surface, respectively, using the UDF &#8211; DEFINE_EXECUTE_AT_END macros, as shown in the UDF above. These two UDFs work fine.&nbsp;&nbsp;&lt;\/p&gt;&lt;p&gt;The change of boundary condition is done by using the DEFINE_PROFILE macro. Initially, the flux value applies as per the condition. But, the problem arises when the PCM average temperature exceeds the T_L; it doesn&#8217;t enter the if condition statement of the 1st while statement; rather, it continues with the else statement. Can you please suggest why the if statement doesn&#8217;t work?&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-367437","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Sir, I wrote a UDF regarding the above-stated problem, which is given below,#include &quot;udf.h&quot;real pcm_tavg;real gc_tavg;#define T_S 494 \/*pcm solidus temperature*\/#define T_L 514 \/*pcm liquidus temperature*\/#define h 10 \/*heat transfer coefficient*\/#define T_amb 300 \/*ambient temperature*\/\/* CALCULATING THE PCM DOMAIN VOLUME WEIGHTED AVERAGE TEMPERATURE*\/DEFINE_EXECUTE_AT_END(pcm_domain_average_temperature){statement----------pcm_tavg = -----;}\/* CALCULATING THE GLASS COVER AREA WEIGHTED AVERAGE TEMPERATURE*\/DEFINE_EXECUTE_AT_END(glass_cover_average_temperature){statement----------gc_tavg = -----;}\/*\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/367437\/\" \/>\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=\"Reply To: Melting and solidification process for different boundary condition&amp; 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