The LES approach implemented in the Kiva-3V code is evaluated on the fully developed flow through a rectangular duct of square cross section. The Reynolds number based on the bulk velocity and duct width is 8000. The number of grid nodes is 96000.Three subgrid scale models are compared: the Smagorinsky, the WALE and the Vreman model.The results differ mainly in the predicted shear stress levels.The Smagorinsky model shows a large overprediction of the shear at the walls, whereas both the WALE and Vreman models perform better due to a reduced contribution of the subgrid-dissipation. In this study the WALE model gives the best results on simulating the secondary flows and turbulence statistics.
|International Journal for Numerical Methods in Engineering
|Published - 2005