{"id":35204,"date":"2019-05-08T12:51:02","date_gmt":"2019-05-08T12:51:02","guid":{"rendered":"\/forum\/forums\/topic\/residuals-transient-simulation\/"},"modified":"2019-05-08T12:51:02","modified_gmt":"2019-05-08T12:51:02","slug":"residuals-transient-simulation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/residuals-transient-simulation\/","title":{"rendered":"Residuals &#8211; Transient Simulation"},"content":{"rendered":"<p>Hello,<\/p>\n<p><\/p>\n<p>I&acute;m running a transient simulation of the compression of a fluid in a closed chamber using the &#8220;compressible liquid&#8221; density method. This method calculate the density as function of the pressure for isothermal condition.<\/p>\n<p><\/p>\n<p>To initialize the simulation, I opened the cylinder and then at 1E-5s I closed it by changing an interface from interior to a wall.<\/p>\n<p><\/p>\n<p>I have used a time step of 1E-6s at the beginning with 100 it\/time step. At 2000 iterations I have change the time step to 5e-6s.<\/p>\n<p><\/p>\n<p>The problem is that the continuity equation is being increase at beginning of each new time step.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/d652d665-7f9c-42a4-8f4c-a96d00d34316\/e8390588-f170-44ba-819a-aa4700d2f76e_resd.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>Should I change the under relaxation factors? Your help is welcome.<\/p>\n<p><\/p>\n<p>Regards,<\/p>\n<p><\/p>\n<p>Maxime<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-35204","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["7376"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0","0"],"_btv_view_count":["5214"],"_bbp_subscription":["237203"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["35204"],"_bbp_forum_id":["27792"],"_bbp_engagement":["25","159144","165133"],"_bbp_voice_count":["3"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["84862"],"_bbp_last_active_id":["84862"],"_bbp_last_active_time":["2019-05-09 12:36:32"]},"test":"max4"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/35204","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\/35204\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=35204"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}