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Communication Dans Un Congrès Année : 2012

Investigation of a turbulent channel flow using large eddy simulation

Résumé

The LES of a compressible turbulent channel flow is performed at a Mach number of 0.5 and a friction Reynolds number $Re_{\tau}=u_{\tau}h/\nu$ around 300, where $u_{\tau}$ is the friction velocity and $h$ is the half-width of the channel. Explicit low-dissipation numerical schemes are employed for spatial derivatives and time integration. Nine simulations are carried out on grids with different mesh spacings in order to study the mesh convergence of turbulence statistics, regarding the mean and fluctuating streamwise velocity profiles. These quantities are found to not vary significantly for mesh spacings smaller than 7.5 and 30 wall units in the spanwise and streamwise directions, respectively. An additional simulation is performed using a semi-implicit Runge-Kutta algorithm, which has been developed for wall-bounded flows. With this algorithm, terms involving wall-normal derivatives are integrated implicitly, while the other terms are integrated explicitly. Thus, the CFL constraint in the wall-normal direction is relaxed. The simulations finaly provide a numerical database, from which wall pressure, wall shear stress and velocity spectra are computed to give insights into the structures developing in the flow.
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hal-00810682 , version 1 (23-04-2012)

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  • HAL Id : hal-00810682 , version 1

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François Kremer, Christophe Bogey, Christophe Bailly. Investigation of a turbulent channel flow using large eddy simulation. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810682⟩
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