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On the scaling of turbulent asymptotic suction boundary layers

Marco Ferro
Linne FLOW Centre KTH Royal Institute of Technology Osquars Backe 18, Stockholm, SE-100 44, Sweden

Bengt E. G. Fallenius
Linne FLOW Centre KTH Royal Institute of Technology Osquars Backe 18, Stockholm, SE-100 44, Sweden

Jens H. M. Fransson
Linne Flow Centre Department of Mechanics KTH–Royal Institute of Technology SE–100 44 Stockholm, Sweden

Resumo

An analysis of turbulent suction boundary layers is carried out on the basis of new experimental data. The streamwise extent of the suction region of the present experimental apparatus is significantly longer than previous studies, allowing us to better investigate the development of boundary layers with wall suction. We show that it is possible to experimentally realize a turbulent asymptotic state where the boundary layer becomes independent of the streamwise direction and of the initial condition, so that the suction rate constitutes the only control parameter. Turbulent asymptotic suction boundary layers appear to be characterized by a mean velocity with a long logarithmic region, with a slope independent of the suction rate if outer scaling is adopted. In addition to the mean-velocity scaling of turbulent asymptotic suction boundary layers, the suction rate threshold for self-sustained turbulence is also investigated.