{"id":160617,"date":"2021-07-23T00:53:55","date_gmt":"2021-07-23T00:53:55","guid":{"rendered":"\/forum\/forums\/topic\/numerical-errors-in-pcm-melting\/"},"modified":"2022-01-31T14:08:56","modified_gmt":"2022-01-31T14:08:56","slug":"numerical-errors-in-pcm-melting","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/numerical-errors-in-pcm-melting\/","title":{"rendered":"NUMERICAL ERRORS IN PCM MELTING"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>Hi, My name is Louis Oguike, a Masters student in Mechanical Engineering at University of Cape Town, I am working on investigating the performance of 3 stage cascade thermal energy storage that employs micro encapsulated spheres containing PCM KOH, KNO3 and NaNO2 sequentially from the inlet during charging and discharging phases. I have some issues with simulating the melting of a PCMs. It&#039;s in a domain where there is a hot incoming HTF at 400C. The PCMs are encapsulated in copper spheres. I hybrid initialized the simulation and patched the PCM temperatures at 27C. The simulation proceeds as expected up until the liquidus temperature of the PCMs is reached the the temperature values oscillate to as high as 3000C. All the walls are coupled and shell conductions were used on spherical encapsulations. The liquid fraction of PCM does not form in all the spheres for reason I know not. I have attached images of the settings I used the proceed with the simulation. Can you render some assistance, please? Also how can constrain the maximum possible temperature to 400 degree and prevent overshoots<\/p>\n<div class=\"embedExternal embedImage\">\n<div class=\"embedExternal-content\">\n<a class=\"embedImage-link\" href=\"\/forum\/wp-content\/uploads\/forum-uploads\/861\/3FC62XFH6QWP.png\" rel=\"nofollow noopener\" target=\"_blank\"><br \/>\n<img decoding=\"async\" class=\"embedImage-img\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/861\/3FC62XFH6QWP.png\" alt=\"BOUNDARY CONDITIONS.png\" \/><br \/>\n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-160617","topic","type-topic","status-closed","hentry","topic-tag-fluent","topic-tag-fluid","topic-tag-heat-transfer","topic-tag-pcm-charging-discharging-2"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":[""],"_bbp_old_reply_author_name_id":["Anonymous"],"_bbp_old_is_reply_anonymous_id":["false"],"_btv_view_count":["713"],"_bbp_likes_count":["0"],"_bbp_subscription":["232131"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["160617"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","213494"],"_bbp_voice_count":["2"],"_bbp_reply_count":["19"],"_bbp_last_reply_id":["186451"],"_bbp_last_active_id":["186451"],"_bbp_last_active_time":["2022-01-31 14:08:56"]},"test":"ogkchi001myuct-ac-za"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/160617","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/160617\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=160617"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}