{"id":318758,"date":"2023-11-21T10:49:07","date_gmt":"2023-11-21T10:49:07","guid":{"rendered":"\/forum\/forums\/topic\/only-inlet-velocity-and-pressure-are-known-venturi-dregde\/"},"modified":"2023-11-21T10:49:07","modified_gmt":"2023-11-21T10:49:07","slug":"only-inlet-velocity-and-pressure-are-known-venturi-dregde","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/only-inlet-velocity-and-pressure-are-known-venturi-dregde\/","title":{"rendered":"Only inlet velocity and pressure are known (venturi dregde)"},"content":{"rendered":"

Hi,<\/p>\n

I’m currently working on a project where I have to design a dredge system (very simple by using the venturi effect to create a suction at the suction inlet by positioning 2 jets that accelerate the flow). I am changing the geometry and trying to discover what the influence of these changes is on the suction inlet velocity. One aspect that I have to investigate as well, is the use of different pumps that operate at the same power but have different amount of stages which results in high flowrate and lower head or higher head and lower flow rate.<\/p>\n

In the picture below my geometry can be seen. I use an operating condition of 1 atm, at the suction inlet 0 Pa gauge pressure, at the outlet 0 Pa pressure and at the jets I convert 16 m^3\/h to corresponding velocity. I want to use pump-curve data at the jet inlets.<\/p>\n

\"\"<\/p>\n

Now my problem: <\/strong>I have trouble with understanding how I can impose the correct boundary conditions when I only know the inlet pressure and inlet velocity. Because using a pressure inlet results in too high flow rates and using Q=16 m^3\/h as velocity inlet (v = Q \/ A \/ 3600), my pressures are too low. <\/p>\n

Question:<\/strong> Which steps do I have to take in order impose a the jet a flow rate of 16m^3\/h and a pressure of 11 bar?<\/p>\n

 <\/p>\n

Please can some help me? Thanks in advance!<\/p>\n","protected":false},"template":"","class_list":["post-318758","topic","type-topic","status-closed","hentry","topic-tag-Inletboundaryconditions-1","topic-tag-pressure-drop","topic-tag-pump","topic-tag-volumetric-flow-rate"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["302661","199"],"_bbp_author_ip":["96.7.218.223"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["426"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["318758"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","302661"],"_bbp_voice_count":["2"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["318835"],"_bbp_last_active_id":["318835"],"_bbp_last_active_time":["2023-11-21 14:09:42"]},"test":"m-boots-1student-tudelft-nl"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/318758","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\/318758\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=318758"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}