Summary
Spatial direct numerical simulations based on the full incompressible unsteady NavierStokes equations are employed to explore the effects of arrays of suction holes on an accelerated 3-D laminar boundary layer. For a hole array with 35 hole rows it turns out that the hole-row order typically has no influence on the amplitudes of the 3-D disturbance modes at the end of the hole array. Due to an averaging effect caused by the changing flow direction no permanent amplification of upstream induced vortex structures is discernible. Localized suction induces disturbance mode combinations consisting of crossflow vortex type eigenmodes (CFV modes) subject to possible primary downstream growth, and other (suction vortex, SV) modes. However, continued discrete suction seems to suppress the CFV-type eigenmodes and favor non-or only weakly growing SV modes.
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References
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Messing, R., Kloker, M.: Effects of suction through arrays of holes on a 3-D boundary layer investigated by spatial direct numerical simulation. In Fasel, H.; Saric, W. (eds.): Laminar-Turbulent Transition Proc. IUTAM Symposium Sedona, Az./USA (1999), Springer-Verlag, 2000.
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Messing, R., Kloker, M. (2001). DNS Study of Suction through Arrays of Holes in a 3-D Boundary-Layer Flow. In: Thiede, P. (eds) Aerodynamic Drag Reduction Technologies. Notes on Numerical Fluid Mechanics (NNFM), vol 76. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-45359-8_10
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DOI: https://doi.org/10.1007/978-3-540-45359-8_10
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-07541-4
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