Highly three dimensional turbulent boundary layers developed over herring-bone type riblet surface are investigated at moderate Reynolds number using particle image velocimetry (PIV) in all three orthogonal planes. Non-simultaneous measurements are performed to capture large fields of view (FOV) of more than 9δ in streamwise, 3δ in spanwise and 1.3δ in wall-normal direction in the respective planes. Observations of the instantaneous velocity fields reveal an extreme modification and rearrangement of the large-scale turbulence structures due to the unique surface topology. The utility of the multi-plane PIV diagnosis is that it uncovers structural modifications to the turbulent boundary layer that would have otherwise not been obvious from single point hot-wire anemometry. Distinct events observed in these multiple orientations are used to create a broader picture of this complicated flow. The new understanding of how turbulent boundary layers behave under the influence of threedimensional secondary flow will be utilised to (re)tailor a passive surface for flow control purposes.
Bagus Nugroho合作论文数Department of Mechanical Engineering, School of Electrical, Mechanical and Infrastructure Engineering, Faculty of Engineering and Information Technology, The University of Melbourne1
Nicholas Hutchins合作论文数Department of Mechanical Engineering, School of Electrical, Mechanical and Infrastructure Engineering, Faculty of Engineering and Information Technology, The University of Melbourne1
Jason Monty合作论文数Division Engineering and IT, University of Melbourne;Department of Mechanical Engineering, University of Melbourne1
Gokul Pathikonda合作论文数George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology1
Kenneth T. Christensen合作论文数Department of Mechanical Engineering, University of New Mexico Albuquerque1
Julio Manuel Barros Jr.合作论文数1
