{"id":51705,"date":"2021-01-28T17:11:14","date_gmt":"2021-01-28T17:11:14","guid":{"rendered":"\/forum\/forums\/topic\/temporaly-using-urf-in-a-vof-simulation\/"},"modified":"2021-01-28T17:11:14","modified_gmt":"2021-01-28T17:11:14","slug":"temporaly-using-urf-in-a-vof-simulation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/temporaly-using-urf-in-a-vof-simulation\/","title":{"rendered":"Temporaly using URF in a VOF simulation"},"content":{"rendered":"<p>I&#8217;m currently performing a classical sloshing problem: water and air inside a tank accelerated under resonance; that gives away a free surface that is exponentially growing. So far it runs perfectly when I insert a submerged vertical baffle in the middle of the tank, but when I set up the same tank but rotate the baffle 45?, the solution get&#8217;s oddly unstable (see link to another discussion where I explain in more detail the simulation \/forum\/discussion\/23824\/how-does-under-relaxation-factors-urf-affect-volume-of-fluid-vof) The simulation is transientnIs it possible to use URF but just in a couple of time-steps? Maybe using a command line in the Original Settings? It should be used only in the beginning, after a few iterations, there should be any. I&#8217;ve been thinking that I could set them up in the beginning and then, after some iterations, set all of them to 1 (something like in this link \/forum\/discussion\/22971\/fsi-volume-of-fluid-calculations-not-patching-the-water-phase ) I want to use them temporarily because my simulation is transient and I don&#8217;t want them to tame or dampe the results over time.nIf anyone knows the command line please let me know!nThank youn<\/p>\n","protected":false},"template":"","class_list":["post-51705","topic","type-topic","status-closed","hentry","topic-tag-command-line","topic-tag-transient","topic-tag-under-relaxation-factors","topic-tag-vof"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["23978"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":["S*??"],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["474"],"_bbp_subscription":["246471"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["51705"],"_bbp_forum_id":["27792"],"_bbp_engagement":["22555","172172","184487"],"_bbp_voice_count":["3"],"_bbp_reply_count":["6"],"_bbp_last_reply_id":["140384"],"_bbp_last_active_id":["140384"],"_bbp_last_active_time":["2021-01-28 19:10:28"]},"test":"pollovr"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/51705","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\/51705\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=51705"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}