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10:30
15 mins
Downstream Evolution of Perturbations in a Zero Pressure Gradient Turbulent Boundary Layer
Eduardo Rodriguez Lopez, Paul J. K. Bruce, Oliver R. J. Buxton
Session: Wall-bounded flows 6
Session starts: Friday 28 August, 10:30
Presentation starts: 10:30
Room: Room B
Eduardo Rodriguez Lopez (Imperial College London)
Paul J. K. Bruce (Imperial College London)
Oliver R. J. Buxton (Imperial College London)
Abstract:
This abstract examines the evolution of perturbations generated by various trips in a turbulent boundary layer. Measurements taken using hot wire anemometry show that the evolution towards the natural state is strongly dependent on the formation mechanisms of the boundary layer, this being different for different wall normal distribution of the trips' blockage. It is observed that standard boundary layer properties are recovered, after an adaptation region, with $175\%$ higher momentum thickness than the natural case. Two-point measurements with time resolved velocity in the inner region are studied to explore the different formation mechanisms.