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Old   October 21, 2014, 19:42
Exclamation Poiseuille_Flow_Pressure_Inlet
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Bryan Rossi
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This is a very simple Flow Model. I am creating it to try and help myself understand a flow problem given to me for an Independent Study.

-I have a simple Pressure inlet with a Gauge Pressure of 2000 pascals and a pressure outlet of 0 gauge Pressure.
-My operating Conditions show that I am using an Operation Pressure of the standard 101325 Pascals.
-I have simple geometry of a 1/2 meter by 4 meter pipe.
-One inlet One outlet with simple laminar steady flow conditions

I am curious as to why the fluid velocity calculated in the pipe is 63 meters per second!!??
Please let me know what I am doing wrong.
Thank You for Your Time
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Old   October 22, 2014, 03:59
David Stanbridge
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I am assuming that you have used air as the medium with the default density at 1.225 kg/m. From non CFD methods then forcing the Reynolds to 1000 (in the laminar zone) the velocity is 80.84 m/s to produce the dP that you have specified. So your prediction of 63 m/s does not seem that far off. If I force the Re to 633 then I can match your 63 m/s number. What fluid properties have you assumed?
David Stanbridge

Swift TG Solutions Limited
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fluent - udf, help -sr_ udf, inlet, pressure

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