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C. Rowley, I. Mezić, S. Bagheri, P. Schlatter, D. Henningson (2009)
Spectral analysis of nonlinear flowsJournal of Fluid Mechanics, 641
Ronald Adrian, Kenneth Christensen, Z. Liu (2000)
Analysis and interpretation of instantaneous turbulent velocity fieldsExperiments in Fluids, 29
P. Schmid, P. Ecole (2008)
Dynamic mode decomposition of numerical and experimental dataJournal of Fluid Mechanics, 656
Qingshan Zhang, Yingzheng Liu (2015)
Influence of incident vortex street on separated flow around a finite blunt plate: PIV measurement and POD analysisJournal of Fluids and Structures, 55
Axel Ruhe (1984)
Rational Krylov sequence methods for eigenvalue computationLinear Algebra and its Applications, 58
H. Beem, M. Hildner, M. Triantafyllou (2012)
Calibration and validation of a harbor seal whisker-inspired flow sensorSmart Materials and Structures, 22
L Sirovich (1987)
Turbulence and the dynamics of coherent structures. Part I: Coherent structuresQ Appl Math, 45
W. Hanke, M. Witte, L. Miersch, M. Brede, J. Oeffner, M. Michael, Frederike Hanke, A. Leder, G. Dehnhardt (2010)
Harbor seal vibrissa morphology suppresses vortex-induced vibrationsJournal of Experimental Biology, 213
N. Schulte-Pelkum, S. Wieskotten, W. Hanke, G. Dehnhardt, B. Mauck (2007)
Tracking of biogenic hydrodynamic trails in harbour seals (Phoca vitulina)Journal of Experimental Biology, 210
K. Lam, F. Wang, R. So (2004)
Three-dimensional nature of vortices in the near wake of a wavy cylinderJournal of Fluids and Structures, 19
M. Witte, W. Hanke, S. Wieskotten, L. Miersch, M. Brede, G. Dehnhardt, A. Leder (2012)
On the Wake Flow Dynamics behind Harbor Seal Vibrissae – A Fluid Mechanical Explanation for an Extraordinary Capability
Yingzheng Liu, Qingshan Zhang (2015)
Dynamic mode decomposition of separated flow over a finite blunt plate: time-resolved particle image velocimetry measurementsExperiments in Fluids, 56
G. Dehnhardt, B. Mauck, W. Hanke, H. Bleckmann (2001)
Hydrodynamic Trail-Following in Harbor Seals (Phoca vitulina)Science, 293
G. Dehnhardt, B. Mauck, H. Bleckmann (1998)
Seal whiskers detect water movementsNature, 394
L. Sirovich (2016)
TURBULENCE AND THE DYNAMICS OF COHERENT STRUCTURES PART
Qingshan Zhang, Yingzheng Liu, Shaofei Wang (2014)
The identification of coherent structures using proper orthogonal decomposition and dynamic mode decompositionJournal of Fluids and Structures, 49
S. Raman, K. Prakash, S. Vengadesan (2013)
Effect of Axis Ratio on Fluid Flow Around an Elliptic Cylinder—A Numerical StudyJournal of Fluids Engineering-transactions of The Asme, 135
L. Sirovich (1987)
Turbulence and the dynamics of coherent structures. II. Symmetries and transformationsQuarterly of Applied Mathematics, 45
(2011)
TR-PIV measurements of the wake behind a grooved cylinder at low Reynolds number
L. Miersch, W. Hanke, S. Wieskotten, Frederike Hanke, Johannes Oeffner, Alfred Leder, M. Brede, Matthias Witte, G. Dehnhardt (2011)
Flow sensing by pinniped whiskersPhilosophical Transactions of the Royal Society B: Biological Sciences, 366
The wake dynamics behind a seal-vibrissa-shaped cylinder, which are closely related to the seal’s extraordinary ability to faithfully track the hydrodynamic trails of its upstream prey, were extensively studied by using time-resolved particle image velocity. Four cylindrical configurations that shared the same hydrodynamic diameter (i.e., a circular cylinder, an elliptical cylinder, a wavy cylinder, and a vibrissa-shaped cylinder) were chosen for the comparative study at the Reynolds number 1.8 × 103. The instantaneous flow fields behind the cylinders were measured along their vertical and horizontal planes. The distinct global differences between the wakes were determined from the streamline patterns, the reverse-flow intermittences, and both the streamwise and longitudinal velocity fluctuation intensities. Compared to the other three systems tested, the vibrissa-shaped cylinder system was characterized by a considerably reduced recirculation zone in the nodal plane, the existence of a very stably reversed flow, and substantial reductions in the streamwise and longitudinal velocity fluctuation intensities. Further cross-correlation of the fluctuating longitudinal velocities showed that the unsteady events behind the vibrissa-shaped cylinder were poorly organized by sequence and considerably constrained in their spatial extent. Finally, a dynamic mode decomposition (DMD) was performed on the instantaneously varying wake flows. In the wavy cylinder system, a single dominant DMD mode at St = 0.2 (corresponding to Karman vortex street) was detected in both the saddle and nodal planes. Although the dominant DMD modes at St = 0.23 and 0.3 were determined in the saddle and nodal planes of the vibrissa-shaped cylinder system, respectively, the spatial pattern of these two DMD modes showed resolved vortical structures that were highly distorted and constrained to an extremely limited space. These DMD modes had much less energy than those in the other three systems. The phase-dependent variations of the wake flows disclosed that the complex unsteady behavior at distinctly different frequencies in the saddle and nodal planes disrupted the regular vortex shedding process, suppressing the vortex-induced vibration of the vibrissa-shaped cylinder.
Experiments in Fluids – Springer Journals
Published: Feb 17, 2016
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