{"id":255921,"date":"2020-09-01T12:16:27","date_gmt":"2020-09-01T12:16:27","guid":{"rendered":"\/forum\/forums\/topic\/cv-flow-coefficient-of-valves-in-aim\/"},"modified":"2023-03-09T07:52:35","modified_gmt":"2023-03-09T07:52:35","slug":"cv-flow-coefficient-of-valves-in-aim","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/cv-flow-coefficient-of-valves-in-aim\/","title":{"rendered":"Cv (Flow coefficient of valves) in AIM"},"content":{"rendered":"<p> Has anybody had much success with calculating the CV of valves ?&nbsp; <\/p>\n<p> I can get calculations to work in the results section but the units seem to be off. I am double checking the equations to make sure units and order of magnitude is correct. Values I get are 150% too high. Geoetry scale imported is correct. <\/p>\n<p>&nbsp;<\/p>\n<p> I&#8217;m also looking to capture this process in the ACT app builder too! <\/p>\n<p>&nbsp;<\/p>\n<p> If anyone has any suggestions or recommendations that would be great.&nbsp; <\/p>\n<p>&nbsp;<\/p>\n<p> My method:&nbsp; <\/p>\n<p> Flow inputs: <\/p>\n<p> 20D upstream and 7D downstream <\/p>\n<p> Mass flow inlet 40 kg\/s <\/p>\n<p> Pressure outlet: 997.7 kPa <\/p>\n<p> Wall boundary <\/p>\n<p> med-high mesh <\/p>\n<p> Results: <\/p>\n<p> Two planes created to capture deltaP <\/p>\n<p> &nbsp; &nbsp; 1st Plane at 18D upstream <\/p>\n<p> &nbsp; &nbsp; 2nd 1D Plane downstream <\/p>\n<p> Calculation for deltaP executed <\/p>\n<p> Calulation for Volumetric flow calculated form MassFlow <\/p>\n<p>&nbsp;<\/p>\n<p> Cv eqaution then calculated. Please see images to help explain in more detail.&nbsp; <\/p>\n<p>&nbsp;<\/p>\n<p> The pressure drop should be 1 PSI or 6.89kPa or 0.00689MPa for a given flow to achieve Cv value. In the pictures the pressure drop is lower than 1 PSI and the CV calculated is 841 (750 expected as from physical testing) <\/p>\n<p>&nbsp;<\/p>\n<p> Other than that maybe my geometry is wrong.&nbsp; <\/p>\n<p>&nbsp;<\/p>\n<p> Thanks for your help<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/discovery\/2023\/03\/31-1.jpg\">&nbsp;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/discovery\/2023\/03\/31-2.jpg\">&nbsp;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/discovery\/2023\/03\/31-3.jpg\">&nbsp;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/discovery\/2023\/03\/31-4.jpg\">&nbsp;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/discovery\/2023\/03\/31-5.jpg\">&nbsp; <\/p>\n","protected":false},"template":"","class_list":["post-255921","topic","type-topic","status-closed","hentry","topic-tag-discovery-aim-2","topic-tag-fluid-volume","topic-tag-fluids"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Has anybody had much success with calculating the CV of valves ? 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I can get calculations to work in the results section but the units seem to be off. I am double checking the equations to make sure units and order of magnitude is correct. Values I get are 150% too high. 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I can get calculations to work in the results section but the units seem to be off. I am double checking the equations to make sure units and order of magnitude is correct. Values I get are 150% too high. 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I can get calculations to work in the results section but the units seem to be off. I am double checking the equations to make sure units and order of magnitude is correct. Values I get are 150% too high. 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I am double checking the equations to make sure units and order of magnitude is correct. Values I get are 150% too high. Geoetry scale imported","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/cv-flow-coefficient-of-valves-in-aim\/","og:image":"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/discovery\/2023\/03\/31-1.jpg","og:image:secure_url":"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/discovery\/2023\/03\/31-1.jpg","article:published_time":"2020-09-01T12:16:27+00:00","article:modified_time":"2023-03-09T07:52:35+00:00","twitter:card":"summary_large_image","twitter:title":"Cv (Flow coefficient of valves) in AIM | Ansys Learning Forum","twitter:description":"Has anybody had much success with calculating the CV of valves ? I can get calculations to work in the results section but the units seem to be off. I am double checking the equations to make sure units and order of magnitude is correct. 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