Abstract The massively separated wake behind a wall-mounted square cylinder is investigated by means of direct numerical simulation (DNS). The effect of inflow conditions is assessed by considering two different cases with matching momentum-thickness Reynolds numbers at the location of the cylinder: one with a fully-turbulent boundary layer as inflow condition, and another one with a laminar boundary layer. The main simulation is performed by using the spectral element code Nek5000. While in the laminar-inflow simulation the horseshoe vortex forming around the cylinder can be observed in the instantaneous flow fields, this is not the case in the turbulent-inflow simulation. Besides, the streaks in the turbulent case become greatly attenuated on both sides of the obstacle. By analyzing the Reynolds shear stress , we show that this is due to the modulation of the horseshoe vortex by the turbulence from the incoming boundary layer.
Characterization of the Massively Separated Wake Behind a Square Cylinder by Means of Direct Numerical Simulation
Proceedings of the 5th International Conference on Jets, Wakes and Separated Flows (ICJWSF2015) ; 3 ; 259-266
Springer Proceedings in Physics ; 185 , 3
2016-01-01
8 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Numerical Study of Massively Separated Flows
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