{"id":162434,"date":"2021-09-21T13:35:13","date_gmt":"2021-09-21T13:35:13","guid":{"rendered":"\/forum\/forums\/topic\/pressure-drop-of-water-laminar-flow-in-a-pipe-is-not-correct\/"},"modified":"2021-09-22T10:38:37","modified_gmt":"2021-09-22T10:38:37","slug":"pressure-drop-of-water-laminar-flow-in-a-pipe-is-not-correct","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/pressure-drop-of-water-laminar-flow-in-a-pipe-is-not-correct\/","title":{"rendered":"Pressure Drop of Water Laminar Flow in a Pipe is not Correct!!"},"content":{"rendered":"
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Hello, <\/p>\n

I faced an strange issue with pressure drop in a laminar water flow in a pipe. <\/p>\n

the case is as follows:<\/p>\n

Pipe diameter: 9.525 mm<\/p>\n

Pipe length: 686 mm<\/p>\n

Re=1284<\/p>\n

Inlet velocity: 0.117 m\/s<\/p>\n

Water density 998.2 kg\/m3; viscosity 0.001 Pa.s<\/p>\n

Model: Laminar<\/p>\n

Flow direction: from bottom to top<\/p>\n

Based on analytical solution, for the vertical pipe, the pressure drop should be about 7600 pa. but what Fluent gives me is 1.18 pa!!!! It seems not accounting elevation pressure! and It reports the same pressure drop for vertical and horizontal pipes!! which is not correct, right?<\/p>\n

This is not the only case, I ran multiple laminar flow simulations (different inlet velocities), and Fluent gave me the same pressure drop for vertical and horizontal orientations!!!<\/p>\n

Am I missing something?<\/p>\n

I would appreciate if you could help me. @Rob<\/a> @DrAmine<\/a> <\/p>\n

<\/p>\n<\/p>\n

Best,<\/p>\n","protected":false},"template":"","class_list":["post-162434","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t