openFoam open channel velocity profile

loren1205 · July 13, 2021, 03:02

Hi everyone.
Does anybody know how to get these velocity profiles for developed turbulent velocity in rectangular channel using simpleFoam and k-epsilon or k-omega methods? The maximum velocity is usually found just below the surface. I'm new into openFoam.

I've been using those methods but my velocity profile always gets uniform.

I attached the schematic of my case and results.

velocity distribution profiles that I want to obtain (just for non random profiles-rectangular, trapezoidal etc.)

https://www.brainkart.com/article/Ve...HD7gp4FqLGgCf8

piu58 · July 13, 2021, 06:19

What is your Reynolds number? At high Reynold numbers there is a steep gradient of velocity near the walls.

loren1205 · July 13, 2021, 07:35

Reynolds is 3 330 000

piu58 · July 13, 2021, 08:00

With such a high Re it can be expected that the free stream velocity is reached very near the walls.

July 13, 2021, 06:19		#2
piu58 Senior Member Uwe Pilz Join Date: Feb 2017 Location: Leipzig, Germany Posts: 744 Rep Power: 15	What is your Reynolds number? At high Reynold numbers there is a steep gradient of velocity near the walls. __________________ Uwe Pilz -- Die der Hauptbewegung überlagerte Schwankungsbewegung ist in ihren Einzelheiten so hoffnungslos kompliziert, daß ihre theoretische Berechnung aussichtslos erscheint. (Hermann Schlichting, 1950)

July 13, 2021, 08:00		#4
piu58 Senior Member Uwe Pilz Join Date: Feb 2017 Location: Leipzig, Germany Posts: 744 Rep Power: 15	With such a high Re it can be expected that the free stream velocity is reached very near the walls. __________________ Uwe Pilz -- Die der Hauptbewegung überlagerte Schwankungsbewegung ist in ihren Einzelheiten so hoffnungslos kompliziert, daß ihre theoretische Berechnung aussichtslos erscheint. (Hermann Schlichting, 1950)

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July 13, 2021, 07:35		#3
loren1205 New Member Loren Join Date: Jul 2021 Posts: 6 Rep Power: 4	Reynolds is 3 330 000