Spatial evolution of wall-imposed disturbance in pipe flow

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Presentation transcript:

Spatial evolution of wall-imposed disturbance in pipe flow Cas van Doorne,1 Jerry Westerweel,1 Frans Nieuwstadt (†), Tobias Schneider2 & Bruno Eckhardt2 1Laboratory for Aero & Hydrodynamics, Delft University of Technology The Netherlands 2Fachbereich Physik, University of Marburg, Germany

Motivation Transition in pipe flow has remained an unresolved problem (Reynolds 1883) Experimental validation of the transition scenario (e.g., DNS by Ma Bing et al. 1999) What is the nature of the boundary between laminar and turbulent flow? (Edge of Chaos, Skufka et al. 2006) Turbulence control?

Laminar disturbance mechanism

Stereo PIV: optical configuration

Stereo PIV

The edge of chaos

Numerical edge trajectory Skufka, Yorke, Eckhardt, PRL 96 (2006) 174101

Edge state structure: off-center jet Experiment Numerical simulation Re = 3000 Re = 2875

LIF visualization

z / D = 3.0

z / D = 5.0

z / D = 8.1

z / D = 11.3

z / D = 14.4

Fully developed turbulence

Reconstructed vorticity

Spectral mode decomposition Re = 3000, 0.25 Hz DNS S-PIV

Conclusions Flow transition induced by laminar disturbance mechanism High-precision S-PIV set-up for measuring cross-flow Disturbance mimics the edge of chaos flow structure Quantitative measurement of development of streaks into packets of hairpin vortices Next: add second disturbance mechanism to achieve flow control in experimental configuration

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