{"id":456191,"date":"2026-04-10T00:52:31","date_gmt":"2026-04-10T00:52:31","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/single-phase-open-channel-flow\/"},"modified":"2026-04-10T00:52:31","modified_gmt":"2026-04-10T00:52:31","slug":"single-phase-open-channel-flow","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/single-phase-open-channel-flow\/","title":{"rendered":"Single Phase- Open Channel Flow"},"content":{"rendered":"<p>&lt;p&gt;Hi,&lt;\/p&gt;&lt;p&gt;I was trying to simulate a rectangular open channel flume from a thesis. I ran the simulation succesfully and my velocity and turbulencce profiles were close to the thesis data. But one crucial issue is that I was not able to establish a zero pressure gradient condition. My professor is asking me to &lt;span data-olk-copy-source=&#8221;MessageBody&#8221;&gt;determine the flow rate that creates zero pressure gradient in the developed region, so that the flow is entirely driven by gravity. My boundary conditions are given below:&lt;br&gt;&lt;br&gt;Inlet: Mass Flow Inlet&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span data-olk-copy-source=&#8221;MessageBody&#8221;&gt;Outlet: Pressure outlet&lt;br&gt;&lt;\/span&gt;Free Surface: Symmetry&lt;\/p&gt;&lt;p&gt;Bottom surface and side wall: Wall&lt;\/p&gt;&lt;p&gt;I have set the gravitational accelartion componets in the following way:&lt;\/p&gt;&lt;p&gt;gx=g*Bed Slope&lt;\/p&gt;&lt;p&gt;gy=0&lt;\/p&gt;&lt;p&gt;gz= &#8211; 9.81&lt;\/p&gt;&lt;p&gt;&lt;br&gt;I will very much appreciate if I could get some proper guidance from this forum on fixing this issue.&lt;\/p&gt;&lt;p&gt;Thanks.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-456191","topic","type-topic","status-publish","hentry","topic-tag-fluent"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["456191"],"_bbp_subscription":["647597","199"],"_bbp_author_ip":["128.233.11.111"],"_bbp_last_reply_id":["456206"],"_bbp_last_active_id":["456206"],"_bbp_last_active_time":["2026-04-10 07:53:47"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["647597","199"],"_btv_view_count":["76"],"_bbp_topic_status":["unanswered"]},"test":"jfe293mail-usask-ca"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/456191","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\/456191\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=456191"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}