{"id":159652,"date":"2021-06-20T11:44:28","date_gmt":"2021-06-20T11:44:28","guid":{"rendered":"\/forum\/forums\/topic\/how-can-i-resolve-a-temperature-error-in-melting-of-a-pcm\/"},"modified":"2021-08-28T09:54:21","modified_gmt":"2021-08-28T09:54:21","slug":"how-can-i-resolve-a-temperature-error-in-melting-of-a-pcm","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-can-i-resolve-a-temperature-error-in-melting-of-a-pcm\/","title":{"rendered":"How can I resolve a temperature error in melting of a PCM."},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>Hi there, <\/p>\n<p>I am new in ansys fluent and I am modelling a PCM latent heat storage system. My PCM is modeled as a Rubi-therm RT10 fluid material. When I model the RT10 with a piecewise linear density, after some iterations suddenly the residuals suddenly increase and become proportional to 100 , and my PCM melts instantly. I receive some reversed flow errors and a temperature limited error. I have attached a screenshot of the residuals at the iteration that it happens. When I simulate the same model with constant density, the model runs smoothly with no errors. <\/p>\n<p>My model is meshed with proximity and a linear mesh sizing of 0.001m, resulting in 1 million nodes. My boundary conditions are velocity inlets for the tube inlets, outflows for the tube outlets and a symmetry plane. I have also added a convection layer between water and tubes as well as pcm and tubes. My under relaxation factors are the default. I use transient simulation, with 1s per time step with energy, solidification\/melting and gravity enabled. <\/p>\n<p>I would really appreciate any suggestion or help for solving these errors or even making better my model. If you need anything more notify me and tell me how I can provide it to you. <\/p>\n<div data-embedjson=\"{&quot;url&quot;:&quot;\/forum\/wp-content\/uploads\/forum-uploads\/484\/YD9U2SZ981W0.png&quot;,&quot;name&quot;:&quot;Screenshot 2021-06-18 195127.png&quot;,&quot;type&quot;:&quot;image\/png&quot;,&quot;size&quot;:243676,&quot;width&quot;:1920,&quot;height&quot;:1080,&quot;embedType&quot;:&quot;file&quot;}\">\n<a href=\"\/forum\/wp-content\/uploads\/forum-uploads\/484\/YD9U2SZ981W0.png\" download aria-label=\"Screenshot 2021-06-18 195127.png\"><br \/>\nScreenshot 2021-06-18 195127.png<br \/>\n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-159652","topic","type-topic","status-closed","hentry","topic-tag-error","topic-tag-fluent","topic-tag-pcm","topic-tag-reversed-flow"],"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":["1214"],"_bbp_likes_count":["0"],"_bbp_subscription":["246433"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["159652"],"_bbp_forum_id":["27792"],"_bbp_engagement":["25","205385"],"_bbp_voice_count":["2"],"_bbp_reply_count":["8"],"_bbp_last_reply_id":["182759"],"_bbp_last_active_id":["182759"],"_bbp_last_active_time":["2021-08-28 09:54:21"]},"test":"george-orfanosoutlook-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/159652","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\/159652\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=159652"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}