{"id":366967,"date":"2024-05-15T14:48:08","date_gmt":"2024-05-15T14:48:08","guid":{"rendered":"\/forum\/forums\/topic\/issue-in-computing-fluxes-through-new-created-surfaces-fluent-2023r2\/"},"modified":"2024-05-15T14:48:08","modified_gmt":"2024-05-15T14:48:08","slug":"issue-in-computing-fluxes-through-new-created-surfaces-fluent-2023r2","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/issue-in-computing-fluxes-through-new-created-surfaces-fluent-2023r2\/","title":{"rendered":"Issue in Computing Fluxes through New Created Surfaces &#8212; Fluent 2023R2"},"content":{"rendered":"<p>Dear All,<\/p>\n<p>&nbsp;<\/p>\n<p>I need to get an info which is somehow crucial: I&#8217;m doing time-dependent simulation of an axisymmatric system using Fluent 2023R2, and I need to monitor the volume flow rate through the cross-section in the middle of a duct. Such cross-section is perpendicular to the axial direction, so in practice it is a radial line. I&#8217;ve defined a new Line-surface (by means of the TUI, that is surface\/line-surface &#8230;) and defined a report definition (Surface Report -&gt; Volume Flow Rate) to get the volumetric flow rate through that surface.<\/p>\n<p>The problem is that the signal I get is the opposite of the one I expect from physics. So I have to conclude that Fluent is considering as normal to the surface the opposite of the one pointing in the positive axial direction.&nbsp;&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>My question is: how does Fluent define the unit normals to surfaces internal to the domain which have been created from the TUI?<\/p>\n<p>&nbsp;<\/p>\n<p>Thanks in advance for the precious help.<\/p>\n<p>Nicol&ograve;<\/p>\n","protected":false},"template":"","class_list":["post-366967","topic","type-topic","status-closed","hentry","topic-tag-fluent"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["76000","199"],"_bbp_author_ip":["184.24.96.207"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["311"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["366967"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","76000"],"_bbp_voice_count":["2"],"_bbp_reply_count":["8"],"_bbp_last_reply_id":["371417"],"_bbp_last_active_id":["371417"],"_bbp_last_active_time":["2024-07-11 09:19:12"]},"test":"nicolo-cappellostudenti-unipd-it"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/366967","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\/366967\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=366967"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}