An experimental study of unsteady hydrodynamics of a single scull

Abstract

The effect of hull dynamics on the hydrodynamic performance of a single scull is investigated via a combination of field trials and tank tests. The location of laminar-turbulent transition in unsteady flow is explored via several series of hot-film measurements on the bow of a full-scale single scull in unsteady flow in both towing tank and field-trial conditions. Results demonstrate that the measured real-world viscous-flow behaviour can be successfully reproduced in the tank using an oscillating sub-carriage to reproduce the surging motion measured in the field trials. It can be seen that there is a strong link between turbulence and acceleration; results show that the link is relatively insensitive to mean velocity, but that small changes in acceleration time-histories can have a marked effect, as can the presence of small waves. The impact of the location of laminar turbulent transition is investigated by way of a series of resistance tests, both with free transition and with transition forced by turbulence stimulation at two different locations. Results indicate that an aft movement of 200mm of the location of transition can reduce resistance by almost 0.5 per cent. Unsteady tests using the oscillating sub-carriage indicate that unsteady effects add around 3 per cent to the total mean resistance with free transition

Kayak blade–hull interactions: A body force approach for self-propelled simulations

“…The variation in kayak hull velocity has been reported to be as low as 4% by Jackson 3 or vary between 5% and 14% depending on the athlete. 21 However, as a velocity variation of over 50% in a rowing shell causes only a 3% increase in resistance, 29 the impact of surge velocity in kayaking is likely to be small but potentially as significant as the hydrodynamic interactions investigated here. There are no published data on the impact of athlete-induced heave and roll motions; however, visual observations indicate that these could also be significant.…”

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

“…The obtained forces for each angle were then substituted into equations 3 and 4 in order to resolve the lift and drag force components where Fn and Ft were the normal force and shear force respectively, and θ was the angle of attack measured between the length of the blade axis to the wall of the flume. and (5,6) The fluid model was meshed using hexa element which was provided by the software. The total number of elements and mesh arrangements depended on the default size assigned to the mesh element.…”

“…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.…”

A Systematic Review of Performance Analysis in Rowing Using Inertial Sensors

“…Kayaking/Canoeing Citation Sport Validation Technology [12] Rowing Optical motion capture [14] Rowing Coach qualitative assessment [17] Rowing Manual feature labelling [18] Rowing Controlled laboratory validation test [20] Rowing Force plates [25] Rowing GPS [27] Rowing GPS [30] Rowing GPS [32] Rowing Navilock-550 ERS [33] Rowing Optical motion capture [38] Rowing GPS [39] Rowing GPS [40] Rowing Optical motion capture [41] Rowing Optical motion capture [42] Canoeing Video Camera [43] Rowing GPS and stroke coach monitor [44] Rowing GPS [46] Rowing Reference measures from rowing simulator [47] Rowing Peach innovations measurement oarlock…”

“…Presenting raw signal data to a coach or an athlete is sometimes inappropriate as distinct biomechanical events are not distinct; noise can be eradicated from a signal using correctly designed filters. A high volume of the reviewed papers used a windowing/filtering technique during their data analysis (15/36-41.7%) [14,18,22,26,27,30,34,[38][39][40][41][42][43][44]47].…”