Next Article in Journal
Spatial Form of a Hamiltonian Dysthe Equation for Deep-Water Gravity Waves
Next Article in Special Issue
Frequency and Amplitude Modulations of a Moving Structure in Unsteady Non-Homogeneous Density Fluid Flow
Previous Article in Journal / Special Issue
Time-Dependent Wave-Structure Interaction Revisited: Thermo-Piezoelectric Scatterers
Article

Fluid-Structure Interaction of Flexible Whisker-Type Beams and Its Implications for Flow Sensing by Pair-Wise Correlation

School of Mathematics, Computer Science and Engineering, University of London, London ECV1 0HB, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Iman Borazjani
Fluids 2021, 6(3), 102; https://doi.org/10.3390/fluids6030102
Received: 4 February 2021 / Revised: 17 February 2021 / Accepted: 1 March 2021 / Published: 3 March 2021
(This article belongs to the Special Issue Fluid Structure Interaction: Methods and Applications)
(1) Background: Sensing of critical events or flow signatures in nature often presents itself as a coupled interaction between a fluid and arrays of slender flexible beams, such a wind-hairs or whiskers. It is hypothesized that important information is gained in highly noisy environments by the inter-correlation within the array. (2) Methods: The present study uses a model sea lion head with artificial whiskers in the form of slender beams (optical fibres), which are subjected to a mean flow with overlaid turbulent structures generated in the wake of a cylinder. Motion tracking of the array of fibres is used to analyse the correlation of the bending deformations of pairs of fibres. (3) Results: Cross-correlation of the bending signal from tandem pairs of whiskers proves that the detection of vortices and their passage along the animals head is possible even in noisy environments. The underlying pattern, during passage of a vortex core, is a jerk-like response of the whiskers, which can be found at later arrival-times in similar form in the downstream whisker’s response. (4) Conclusions: Coherent vortical structures can be detected from cross-correlation of pairs of cantilever-beam like sensors even in highly turbulent flows. Such vortices carry important information within the environment, e.g., the underlying convection velocity. More importantly in nature, these vortices are characteristic elementary signals left by prey and predators. The present work can help to further develop flow, or critical event, sensory systems which can overcome high noise levels due to the proposed correlation principle. View Full-Text
Keywords: tandem cylinders; flexible beams; fluid–structure interaction; whisker sensing; cross-correlation; coherent vortices; convection velocity; optical fiber sensors; pinniped head tandem cylinders; flexible beams; fluid–structure interaction; whisker sensing; cross-correlation; coherent vortices; convection velocity; optical fiber sensors; pinniped head
Show Figures

Figure 1

MDPI and ACS Style

Glick, R.; Muthuramalingam, M.; Brücker, C. Fluid-Structure Interaction of Flexible Whisker-Type Beams and Its Implications for Flow Sensing by Pair-Wise Correlation. Fluids 2021, 6, 102. https://doi.org/10.3390/fluids6030102

AMA Style

Glick R, Muthuramalingam M, Brücker C. Fluid-Structure Interaction of Flexible Whisker-Type Beams and Its Implications for Flow Sensing by Pair-Wise Correlation. Fluids. 2021; 6(3):102. https://doi.org/10.3390/fluids6030102

Chicago/Turabian Style

Glick, Raphael, Muthukumar Muthuramalingam, and Christoph Brücker. 2021. "Fluid-Structure Interaction of Flexible Whisker-Type Beams and Its Implications for Flow Sensing by Pair-Wise Correlation" Fluids 6, no. 3: 102. https://doi.org/10.3390/fluids6030102

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop