DNS-Investigations of the Development and Control of Crossflow Vortices in a 3-D Boundary-Layer Flow
The development and control of steady crossflow-vortex (CFV) packets in a laminar 3-d flat-plate boundary-layer flow is investigated by means of spatial Direct Numerical Simulations based on the complete incompressible 3-d NavierStokes equations. The boundary-layer flow is generic for an infinite swept wing, with favorable and ensuing adverse chordwise pressure gradient. The CFV packets investigated represent disturbances generated either by a spanwise row of bulges or dents. First, the respective downstream growth with nonlinear effects is simulated. Second, the active downstream control by different control strategies, and the effect of a passive, steady upstream 3-d flow deformation (UFD) is investigated in detail.
KeywordsLarge Eddy Simulation Direct Numerical Simulation Linear Stability Theory Downstream Development Control Strip
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- 1.Bonfigli, G.; Kloker, M.: Spatial Navier-Stokes simulation of crossflow-induced transition in a 3-D boundary layer. In Nitsche, W.G.; Hilbig, R., (eds.): New results in numerical and experimental fluid dynamics. 11. STAB/DGLR Symposium, November 1998. NNFM, Vieweg Verlag, Berlin.Google Scholar
- 3.Saric, W.S.; Carrillo, Jr.; Reibert, M.S.: Leading-Edge Roughness as a Transition Control Mechanism. AIAA-98–0781, 1998.Google Scholar
- 4.Spalart, P.R.; Crouch, J.D.; Ng, L.L.: Numerical study of realistic perturbations in 3-D boundary layers. In Proc. A GARD Conf.: Application of Direct and Large Eddy Simulation to Transition and Turbulence, AGARD-CP-551, pp. 30.1 — 30.10., Chania, Crete, Greece, 1994.Google Scholar
- 5.Wassermann, P.; Kloker, M.: Direct Numerical Simulation of the Development and Control of Boundary-Layer Crossflow Vorticies. In: see Google Scholar