{"id":49620,"date":"2020-11-06T06:17:08","date_gmt":"2020-11-06T06:17:08","guid":{"rendered":"\/forum\/forums\/topic\/piso-vs-simple-coupled-solvers\/"},"modified":"2020-11-06T06:17:08","modified_gmt":"2020-11-06T06:17:08","slug":"piso-vs-simple-coupled-solvers","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/piso-vs-simple-coupled-solvers\/","title":{"rendered":"PISO vs SIMPLE &#038; Coupled solvers"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>Hi everyone,<\/p>\n<p>I developing a transient droplet falling simulation model and play around with the Presure-Velocity Coupling methods, Coupled and SIMPLE both converged at the 3rd time steps and gave good results. However, the PISO method all three residuals are diverging. The Fluent theory guide introduced PISO as a part of the SIMPLE family and the skewness &amp; Neightbour correction factors give higher efficiency. Could anyone assist me understand why PISO is diverging with the other settings the same as SIMPLE &amp; Coupled?<\/p>\n<p>Best regards,<\/p>\n<p>Lugia_06<\/p>\n<p>PISO<\/p>\n<div class=\"embedExternal embedImage\">\n<div class=\"embedExternal-content\">\n<a class=\"embedImage-link\" href=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/QO2ZCGQU7GU7\/image.png\" rel=\"nofollow noopener\" target=\"_blank\"><br \/>\n<img decoding=\"async\" class=\"embedImage-img\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/QO2ZCGQU7GU7\/image.png\" alt=\"image.png\" \/><br \/>\n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-49620","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["21859"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":["g7\/c"],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["7879"],"_bbp_subscription":["255183"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["49620"],"_bbp_forum_id":["27792"],"_bbp_engagement":["22555","181061"],"_bbp_voice_count":["2"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["132330"],"_bbp_last_active_id":["132330"],"_bbp_last_active_time":["2020-11-06 21:31:56"]},"test":"lugia_06"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/49620","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\/49620\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=49620"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}