{"id":31343,"date":"2018-11-06T05:26:06","date_gmt":"2018-11-06T05:26:06","guid":{"rendered":"\/forum\/forums\/topic\/how-to-consider-the-effect-of-gravity-and-buoyancy\/"},"modified":"2018-11-06T05:26:06","modified_gmt":"2018-11-06T05:26:06","slug":"how-to-consider-the-effect-of-gravity-and-buoyancy","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-consider-the-effect-of-gravity-and-buoyancy\/","title":{"rendered":"How to consider the effect of gravity and buoyancy ?"},"content":{"rendered":"<p>&nbsp;I&#8217;m doing a caculation about the two phase flow in&nbsp;<span style=\"color: #d52020; font-family: Arial, 'Microsoft YaHei', 'FAE???', 'B8B?', 'Malgun Gothic', Meiryo, sans-serif; font-size: 13.6px;\">floatation tank by fluent. I use Mixture model ,and enable the gravity. The mass transfer between two phase and surface tension have been ignored. The air volume fration is set as 0.1 in velocity inlet boundary. The air volume fraction shloud be a much high value at the top and low value at the bottom, while my result show that air volume fraction in almost the whole domain has the same value. I think&nbsp;&nbsp;the &nbsp;effect of gravity and buoyancy should be included in this caculation, while I can&#8217;t ontain the right results &nbsp;following the guideline of ANSYS help &#8220;<\/span>Natural Convection and Buoyancy-Driven Flows .&nbsp;<span style=\"color: #d52020; font-family: Arial, 'Microsoft YaHei', 'FAE???', 'B8B?', 'Malgun Gothic', Meiryo, sans-serif; font-size: 13.6px;\">&#8220;<\/span><\/p>\n<p><\/p>\n<p>So how to consider the effect of &nbsp;gravity and buoyancy when using Mixture model to calculate the water-air two phase flow?<\/p>\n","protected":false},"template":"","class_list":["post-31343","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["3515"],"_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","0","0","0"],"_btv_view_count":["3098"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["31343"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","22555","158751"],"_bbp_voice_count":["3"],"_bbp_reply_count":["13"],"_bbp_last_reply_id":["69138"],"_bbp_last_active_id":["69138"],"_bbp_last_active_time":["2018-11-13 06:13:07"]},"test":"long-yun"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/31343","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\/31343\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=31343"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}