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-   -   turbulent channel flow with spanwise oscillating velocity boundary condition (http://www.cfd-online.com/Forums/openfoam-solving/121770-turbulent-channel-flow-spanwise-oscillating-velocity-boundary-condition.html)

arnaud6 August 5, 2013 07:13

turbulent channel flow with spanwise oscillating velocity boundary condition
 
Hello foamers,

I'm trying to validate Stokes second problem, which is a turbulent channel flow with the bottom and top walls in spanwise oscillation. To do this, I have changed the oscillatingFixedValue already implemented in the software.
I have changed from Vwall=1+Asinwt to Vwall=Asinwt in the 0/U directory for the bottom and top walls. My results are not so good and I am currently wondering whether I should change the 0/k file ?
As the turbulent kinetic energy k is only linked to the fluctuations, k=1/2*(u'2 +v'2+w'2), do the wall movements keep k=0 on the walls? Or does it introduce a sinusoidal value of k?

Thanks for your help !

arnaud6 August 5, 2013 14:18

I precise that I am using LES with OneEqEddy (like in the channel395 tutorial case) and working at a Retau=200.


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