Pregled bibliografske jedinice broj: 422419
Three-dimensional numerical simulation of flow around a 1:5 rectangular cylinder
Three-dimensional numerical simulation of flow around a 1:5 rectangular cylinder // EACWE5 - 5th European & African Conference on Wind Engineering
Firenza : München, 2009. (predavanje, međunarodna recenzija, cjeloviti rad (in extenso), znanstveni)
CROSBI ID: 422419 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
Three-dimensional numerical simulation of flow around a 1:5 rectangular cylinder
Autori
Mannini, Claudio ; Weinman, Keith ; Šoda, Ante ; Schewe, Guenter
Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni
Skup
EACWE5 - 5th European & African Conference on Wind Engineering
Mjesto i datum
Firenca, Italija, 19.07.2009. - 23.07.2009
Vrsta sudjelovanja
Predavanje
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
Computational Fluid Dynamics; Bluff bodies; Rectangular cylinder; Detached-Eddy Simulation; Turbulence modelling.
Sažetak
This paper deals with the three-dimensional simulation of the unsteady flow around a stationary 1:5 rectangular cylinder at zero-degree angle of attack, low Mach number and relatively high Reynolds number. The computations have been performed using the DLR-Tau code, a non-commercial finite-volume code developed at the German Aerospace Center, and results obtained with a hybrid mesh are validated against the available experimental data, showing good agreement. Detached-Eddy Simulation (DES), a hybrid method combining Large-Eddy Simulation (LES) and Raynolds-Averaged Navier-Stokes (RANS) approaches, has been adopted as strategy of turbulence modelling. The comparison with respect to unsteady RANS results, although obtained with advanced turbulence models, show the improvement that can be expected with the DES technique for this type of massively separated bluff-body flows. The paper also clarifies the key role played in LES, and therefore DES, simulations by the artificial dissipation characterizing the numerical scheme used to discretize the filtered Navier-Stokes equations. Finally, the discussed results highlight the effects of the spanwise extension of the computational domain. A distance between the periodic boundary planes equal to the width of the cylinder is not enough to allow the natural loss of correlation of pressures and the free development of large-scale turbulent structures. In contrast, a span equal to the double of the cylinder width seems to fulfill this requirement.
Izvorni jezik
Engleski
Znanstvena područja
Strojarstvo
