{"id":36850,"date":"2019-07-30T14:36:17","date_gmt":"2019-07-30T14:36:17","guid":{"rendered":"\/forum\/forums\/topic\/gradient-adaptation\/"},"modified":"2019-07-30T14:36:17","modified_gmt":"2019-07-30T14:36:17","slug":"gradient-adaptation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/gradient-adaptation\/","title":{"rendered":"Gradient Adaptation"},"content":{"rendered":"<p>Good Afternoon,<\/p>\n<p><\/p>\n<p><span style=\"mso-ansi-language: EN-US;\">I am trying to simulate the interface between two immiscible fluids using VOF method. In order to capture the interface between the two fluids I am using an adaptive gradient mesh that refines at the interface between the two phases (see Fig. 1). Since the droplet is not always at the same position in the channel, I am also coarsening the mesh. In order to do that, I&rsquo; am using the following set-up of the mesh gradient adaptation (Figure1) which works properly.<\/span><\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/89ca82c4-d3ed-4699-9b57-aa9a00ed33c0\/eb092ef7-0626-472c-8680-aa9a00f06aad_gradadapt2.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/89ca82c4-d3ed-4699-9b57-aa9a00ed33c0\/db688591-c66b-481c-8727-aa9a00f09ee6_gradadapt.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p><span style=\"mso-ansi-language: EN-US;\">To reach this result I&rsquo;ve tried many different combinations of threshold (refine + coarsen). I read that the Refine threshold is usually set at 10% of the maximum value, but I don&rsquo;t understand why this simulation is perfectly working with a threshold of 1 for the coarsen threshold (which from what I&rsquo;ve understood from the manual wouldn&rsquo;t make any sense, and should be lower than the refine threshold value).<\/span><\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p><span style=\"mso-ansi-language: EN-US;\">I would like to understand why the case set-up like this works, even though according to your manual it should be set-up differently<\/span><\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p><span style=\"mso-ansi-language: EN-US;\">Many thanks in advance,<\/span><\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p><span style=\"mso-ansi-language: EN-US;\">Berny<\/span><\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-36850","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["9024"],"_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":["379"],"_bbp_subscription":["241765"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["36850"],"_bbp_forum_id":["27792"],"_bbp_engagement":["167212"],"_bbp_voice_count":["1"],"_bbp_reply_count":["0"],"_bbp_last_reply_id":["0"],"_bbp_last_active_id":["36850"],"_bbp_last_active_time":["2019-07-30 14:36:17"]},"test":"berny"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/36850","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\/36850\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=36850"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}