{"id":159888,"date":"2021-06-27T11:10:58","date_gmt":"2021-06-27T11:10:58","guid":{"rendered":"\/forum\/forums\/topic\/vof-does-not-show-a-sharp-interface\/"},"modified":"2021-06-28T16:32:30","modified_gmt":"2021-06-28T16:32:30","slug":"vof-does-not-show-a-sharp-interface","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/vof-does-not-show-a-sharp-interface\/","title":{"rendered":"VOF does not show a sharp interface"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>Hi everyone,<\/p>\n<p>I am trying to simulate the natural evaporation of a thin water film. Basically, there is dry air passing through above the water liquid film, and the water liquid is expected to evaporate into the dry air.<\/p>\n<p>I used VOF and enabled the sharp interface and interfacial anti-diffusion, as well the evaporation-condensation Lee model.<\/p>\n<p>However, as the picture shows, the interface between the water liquid and the air (the air is the mixture of water vapour and dry air) is not &quot;sharp&quot; at all. Instead, there is a gradient of volume fraction of water liquid. How could this be? I expected the interface should only occupy one layer of cells, which mean except for one layer of cells, other cells should be either 0 volume fraction of water liquid or 1 volume fraction.<\/p>\n<p>Could somebody please help? Thanks<\/p>\n<p>Regards<\/p>\n<div class=\"embedExternal embedImage\">\n<div class=\"embedExternal-content\">\n<a class=\"embedImage-link\" href=\"\/forum\/wp-content\/uploads\/forum-uploads\/957\/JRIG2O3HD8YS.png\" rel=\"nofollow noopener\" target=\"_blank\"><br \/>\n<img decoding=\"async\" class=\"embedImage-img\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/957\/JRIG2O3HD8YS.png\" alt=\"image.png\" \/><br \/>\n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-159888","topic","type-topic","status-closed","hentry","topic-tag-evaporation-condensation","topic-tag-fluent","topic-tag-multiphase","topic-tag-vof"],"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":["1612"],"_bbp_likes_count":["0"],"_bbp_subscription":["253604"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["159888"],"_bbp_forum_id":["27792"],"_bbp_engagement":["9108","22555","191131"],"_bbp_voice_count":["3"],"_bbp_reply_count":["12"],"_bbp_last_reply_id":["183605"],"_bbp_last_active_id":["183605"],"_bbp_last_active_time":["2021-06-28 16:32:30"]},"test":"b404957074"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/159888","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\/159888\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=159888"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}