空間発展DNSによる超音速乱流遷移境界層のストリーク構造についての研究(乱流(1),一般講演)

概要

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Spatial direct numerical simulations (DNS) are performed to study the large-scale and near-wall structures in a supersonic flat plate boundary layer, where the free stream Mach number is 2.3 and the Reynolds number up to Re_θ=2717. Turbulent statistics scaled by the mean density profile collapsed with experimental data and previous temporal simulations. Instantaneous velocity field of the low-speed streak and hairpins shows that the large-scale structures with hairpin packets and horseshoes in the supersonic flat plate boundary layer are generated due to the interaction of the large-scale motions with the near-wall structure. It is also shown that the horseshoe vortices are of similar scale as the boundary layer thickness in the wall-normal direction as shown in incompressible experiments at low Reynolds number and the spanwise scale of the near-wall structures increases with increasing wall-normal distance as found in incompressible wall turbulence.
日本流体力学会の論文
2010-09-09