Robotic Volumetric PIV measurements of a full-scale swimmer’s hand

Robotic Volumetric PIV measurements of a full-scale swimmer’s hand

van den Berg, Joris (Student TU Delft)
Jux, C. (TU Delft Aerodynamics)
Sciacchitano, A. (TU Delft Aerodynamics)
van de Water, W. (TU Delft Fluid Mechanics)
Westerweel, J. (TU Delft Fluid Mechanics)

Kähler, Christian J. (editor)
Hain, Rainer (editor)
Scharnowski, Sven (editor)
Fuchs, Thomas (editor)

2019

The flow field around a full-scale swimmer’s hand model with varying thumb positions is investigated by robotic volumetric PIV. The experiment is conducted in the Open Jet Facility wind tunnel at TU Delft at 15m/s. Quantitative flow field information is constructed with 3D-PTV in a 120 liter volume, encompassing the full hand and arm. The effect of spatial resolution on the time-averaged flow field is investigated. A large-scale recirculating wake behind the hand is accurately identified at a linear bin size of 20mm whereas the accelerated flow between individual fingers can only be resolved at bin sizes below 10mm where 5mm results in a statistically unconverged velocity field. The influence of the thumb is limited to one side of the hand where its presence results in a larger stagnated region in front and larger wake behind the hand, depending on the thumb position. Closing the thumb strengthens the recirculation but results in a smaller velocity deficit downstream, suggesting a smaller propulsive force generation which is considered disadvantageous in competitive swimming.

http://resolver.tudelft.nl/uuid:ddfa5436-d591-4ab0-b150-d2d7078d8e27

https://doi.org/10.18726/2019_3

Universitat der Bundeswehr Munchen

978-3-943207-39-2

Proceedings of the 13th International Symposium on Particle Image Velocimetry: 22-27 July, Munich, Germany

13th International Symposium on Particle Image Velocimetry, 2019-07-22 → 2019-07-24, Munchen, Germany

Institutional Repository

conference paper

© 2019 Joris van den Berg, C. Jux, A. Sciacchitano, W. van de Water, J. Westerweel