Numerical modelling of rowing blade hydrodynamics

Sliasas, Andrew; Tullis, S.

doi:10.1007/s12283-009-0026-3

Cited by 14 publications

(15 citation statements)

References 11 publications

(22 reference statements)

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“…Research on oar blade hydrodynamics that does account for a free surface and for accelerations of the oar blade was performed by Sliasas & Tullis (2009). They investigated both steady flow over an oar blade as well as unsteady flow, i.e.…”

Section: Previous Work On Hydrodynamics In Rowingmentioning

confidence: 99%

Drag force on an accelerating submerged plate

et al. 2019

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We present results on the drag on, and the flow field around, a submerged rectangular normal flat plate, which is uniformly accelerated to a constant target velocity along a straight path. The plate aspect ratio is chosen to be $AR=2$ to resemble an oar blade in (competitive) rowing, the sport which inspired this study. The plate depth, i.e. the distance from the top of the plate to the air–water interface, the plate acceleration and the plate target velocity are varied, resulting in a plate width based Reynolds number of $4\times 10^{4}\lesssim Re\lesssim 8\times 10^{4}$. In our analysis we distinguish three phases; (i) the acceleration phase during which the plate drag is enhanced, (ii) the transition phase during which the plate drag decreases to a constant steady value upon which (iii) the steady phase is reached. The plate drag force is measured as function of time which showed that the steady-phase plate drag at a depth of $1/5$ plate height (20 mm depth for a plate height of 100 mm) increased by 45 % compared to the plate top at the surface (0 mm). Also, it is shown that the drag force during acceleration of the plate increases over time and is not captured by a single added mass coefficient for prolonged accelerations. Instead, an entrainment rate is defined that captures this behaviour. The formation of starting vortices and the wake development during the time of acceleration and transition towards a steady wake are studied using hydrogen bubble flow visualisations and particle image velocimetry. The formation time, as proposed by Gharib et al. (J. Fluid Mech., vol. 360, 1998, pp. 121–140), appears to be a universal time scale for the vortex formation during the transition phase.

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Section: Previous Work On Hydrodynamics In Rowingmentioning

confidence: 99%

Drag force on an accelerating submerged plate

et al. 2019

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“…This numerical technique for solving an approximate form of the Navier-Stokes equations has been initially developed in the Aerospace and Automotive industrial fields [1][2][3][4]. Thanks to the current accessibility of high computational resources at affordable prices, CFD is applied to a wide range of sport related problems in nautical disciplines, from America's Cup [5] to kayak [6] and rowing boats [7][8][9], in swimming [10][11][12] and as a well-established method in cycling [13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

CFD analysis of internal ventilation in high-speed human powered vehicles

Baldissera

Delprete

2017

Sports Eng

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“…Hydrodynamic forces acting on blades have been studied by several researchers [1][2][3][4][5][6]. There is a significant effect of the hydrodynamic force towards rowing performance as it is used to accelerate the boat.…”

Section: Introductionmentioning

confidence: 99%

“…The hydrodynamic force generated on the blade is the result of the lift and drag forces are formulated as in equation 1 and 2 [2,9]. Currently, the fluid mechanics of rowing can be investigated using computational study in which the reliability of the method in solving issues of interest is undoubted and used widely to study fluid mechanics [1,3,10]. The fluid flow around the blade have been successfully modeled and validated by comparison with the experimental data by Leroyer [11].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of hydrodynamic force acting on commercialized rowing blades using computational fluid dynamics

Aziz

Harun

Syahrom

et al. 2017

AIP Conference Proceedings

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This paper presents a study of the hydrodynamics of several rowing blade designs. The study was done using Computational Fluid Dynamics (CFD) which enabled the investigation to be done similar to the experimental study, but with additional hydrodynamic visualization for further analysis and understanding. The CFD method was validated using quasi-static experimental data from Caplan (2007). Besides that, the proposed CFD analyses have improved the precious CFD results with the percentage of error of 6.58 percent of lift and 0.69 percent of drag force compared to 33.65 and 18.75 percent obtained by Coppel (2010). Consequent to the successful validation, the study then proceeded with the real size of Macon, Big balde and Fat blade. It was found that the hydrodynamic performance of the Fat blade was the highest due to the area, aspect ratio and the shape of the blade. Besides that, distribution of pressure for all models were also investigated which deepened the understanding of the blade fluid mechanics of rowing.

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Numerical modelling of rowing blade hydrodynamics

Cited by 14 publications

References 11 publications

Drag force on an accelerating submerged plate

Drag force on an accelerating submerged plate

CFD analysis of internal ventilation in high-speed human powered vehicles

Analysis of hydrodynamic force acting on commercialized rowing blades using computational fluid dynamics

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