Bulk velocity

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 August 17, 2011, 14:10 Bulk velocity #1 New Member   Miguel Caro Join Date: Apr 2010 Posts: 26 Rep Power: 7 Hello, i am trying to simulate a turbulent flow around a wall-mounted cube using the kappa-epsilon model and, in a future, the RNG- kappa-epsilon model. The Reynolds number based on the bulk velocity and the channel height (Re=U_b* H/nu, U_b bulk velocity, H cube height and nu cinematic viscosity) is Re=40000. But , excuse me for this question: How i compute the bulk velocity? I am using to simulate this problem an in-house code for turbulent flows , for this i need the inflow velocity , Uo ,to start the simulation. The H value is done as the Re above mentioned. The initial and boundary conditions are taken from Lakehal and Rodi,"Calculation of the flow past a surface-mounted cube with two-layer turbulence models", 1997. regards Miguel

 August 18, 2011, 10:02 #2 New Member   Miguel Caro Join Date: Apr 2010 Posts: 26 Rep Power: 7 Turbulent flows, S. Pope, "wall flows", p.p.264-280.

 August 22, 2011, 06:23 #3 Senior Member   Rami Ben-Zvi Join Date: Mar 2009 Posts: 148 Rep Power: 8

March 19, 2013, 08:06
#4
Senior Member

Jose Rey
Join Date: Oct 2012
Posts: 123
Rep Power: 8

Quote:
 The stressComponents postprocessing utility (utilities/postProcessing/stressField/stressComponents.C) provides a Ub vector (x,y,z) mapped on surfaces. What is the physical meaning of Ub?
I know this is a pretty old thread, but this might give it a happy ending.

 Tags bukk velocity, reynolds number, turbulent flows

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