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Keywords: drag
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Journal Articles
J Exp Biol (2021) 224 (2): jeb230961.
Published: 1 February 2021
... Foraminifera tests, sunk in viscous mineral oil to match their Reynolds numbers and drag coefficients, we predicted sinking velocity of real tests in seawater. This method can be applied to study other settling particles such as plankton, spores or seeds. The transport of organisms and biologically derived...
Includes: Supplementary data
Journal Articles
J Exp Biol (2020) 223 (20): jeb226654.
Published: 28 October 2020
.... Adhesion at these locations offers remoras drag reduction of up to 71–84% compared with the freestream. Remoras were observed to move freely along the surface of the whale using skimming and sliding behaviors. Skimming provided drag reduction as high as 50–72% at some locations for some remora sizes...
Includes: Supplementary data
Journal Articles
J Exp Biol (2019) 222 (22): jeb212464.
Published: 18 November 2019
... fields and distributions of thrust and drag along the body. Lampreys initiated acceleration from rest with the formation of a high-amplitude body bend at approximately one-quarter body length posterior to the head. This deep body bend produced two high-pressure regions from which the majority of thrust...
Journal Articles
J Exp Biol (2018) 221 (7): jeb177600.
Published: 11 April 2018
... in the previous work was based on a constant drag coefficient ( C D =1), whereas air resistance was higher in our experiments, considering the change in C D with Reynolds number. The mean values of the drag coefficient per jump were 27% higher in males (2.15±0.31 and 1.69±0.14 for males and females...
Includes: Supplementary data
Journal Articles
J Exp Biol (2016) 219 (21): 3399–3411.
Published: 1 November 2016
... the raptorial appendages of mantis shrimp (Stomatopoda) using a combination of flume experiments, mathematical modeling and phylogenetic comparative analyses. We found that computationally efficient blade-element models offered an accurate first-order approximation of drag, when compared with a more elaborate...
Includes: Supplementary data
Journal Articles
J Exp Biol (2016) 219 (21): 3480–3491.
Published: 1 November 2016
.... A hydrodynamic drag function ( D ) based on single-point time-averaged velocity statistics that incorporates the influence of turbulent fluctuations was used to infer the energetic cost of steady swimming. Novel hydrodynamic preference curves were developed and used to assess the appropriateness of D...
Includes: Supplementary data
Journal Articles
J Exp Biol (2016) 219 (19): 3146–3154.
Published: 1 October 2016
... than during gliding. Advance ratio Drag Flexed Extended Wind tunnel Propeller Lift Flying birds use their wings to accomplish a diverse range of behaviors, including take-off and landing, maneuvering, cruising and soaring flight. Aerodynamic performance during each type...
Includes: Supplementary data
Journal Articles
J Exp Biol (2016) 219 (16): 2458–2468.
Published: 15 August 2016
... bottlenose whales with data loggers that recorded depth, 3-axis acceleration and speed either with a fly-wheel or from change of depth corrected by pitch angle. We fitted measured values of the change in speed during 5 s descent and ascent glides to a hydrodynamic model of drag and buoyancy forces using...
Includes: Supplementary data
Journal Articles
J Exp Biol (2015) 218 (7): 1099–1110.
Published: 1 April 2015
... . 10.1111/j.1365-2435.2010.01801.x Greek-Walker , M. and Pull , G. A. ( 1975 ). A survey of red and white muscle in marine fish . J. Fish Biol.   7 , 295 - 300 . 10.1111/j.1095-8649.1975.tb04602.x Hainsworth , F. R. ( 1988 ). Induced drag savings from ground effect...
Includes: Supplementary data
Journal Articles
J Exp Biol (2014) 217 (23): 4229–4236.
Published: 1 December 2014
...Julie M. van der Hoop; Andreas Fahlman; Thomas Hurst; Julie Rocho-Levine; K. Alex Shorter; Victor Petrov; Michael J. Moore Attaching bio-telemetry or -logging devices (‘tags’) to marine animals for research and monitoring adds drag to streamlined bodies, thus affecting posture, swimming gaits...
Journal Articles
J Exp Biol (2014) 217 (15): 2740–2751.
Published: 1 August 2014
... in length. Animals at this scale generally operate within the regime of intermediate Reynolds numbers, where both viscous and inertial fluid forces have the potential to play a role in propulsion. The present study aimed to resolve which forces create thrust and drag in the paddling of the water boatman...
Includes: Supplementary data
Journal Articles
J Exp Biol (2014) 217 (9): 1485–1495.
Published: 1 May 2014
... 2014 Accelerometer Disturbance Drag Energetics Field metabolic rate Flipper stroking Foraging Locomotion Translocation For aquatic animals, the cost of transport (COT; the energetic cost of covering a unit distance) is a substantial component of foraging efficiency; moving through...
Journal Articles
J Exp Biol (2014) 217 (7): 1167–1174.
Published: 1 April 2014
... with hosts. This study explored the biomechanical costs and benefits of the epiphytic association between the intertidal brown algal epiphyte Soranthera ulvoidea and its red algal host Odonthalia floccosa . Drag on epiphytized and unepiphytized hosts was measured in a recirculating water flume. A typical...
Journal Articles
J Exp Biol (2013) 216 (9): 1717–1725.
Published: 1 May 2013
... be a significant selective factor acting on body shape. On exposed shores, narrower arms probably reduce both lift and drag in breaking waves. On protected shores, fatter arms may provide more thermal inertia to resist overheating, or more body volume for gametes. Such plastic changes in body shape represent...
Includes: Supplementary data
Journal Articles
J Exp Biol (2012) 215 (21): 3693–3702.
Published: 1 November 2012
..., indicates that peak coefficients of lift and drag ( C L and C D ) and lift-to-drag ratio ( C L : C D ) increase throughout ontogeny and that these patterns correspond with changes in feather microstructure. To begin to place these results in a comparative context that includes variation in life-history...
Includes: Supplementary data
Journal Articles
J Exp Biol (2012) 215 (20): 3622–3630.
Published: 15 October 2012
... the COT model at vertical pitch angles. As there is little agreement about an appropriate value for λ ( Aoki et al., 2011 ), we used λ=1.0 (but see Discussion). * Author for correspondence ( pm29@st-andrews.ac.uk ) 10 1 2012 1 6 2012 © 2012. 2012 drag buoyancy cost...
Includes: Supplementary data
Journal Articles
J Exp Biol (2011) 214 (17): 2973–2987.
Published: 1 September 2011
... in response to the need to produce thrust required to overcome combined drag and buoyancy forces. This work was funded by the program bio-logging Science of the University of Tokyo (UTBLS), Grant-in Aids for Science Research from the Japan Society for the Promotion of Science (21681002), the National...
Includes: Supplementary data
Journal Articles
J Exp Biol (2011) 214 (16): 2655–2659.
Published: 15 August 2011
... enabled us to observe the change in overall shape of the urchins and quantify the decrease in spine angle that occurred as flow speeds increased. The effect of this behaviour on drag and lift was measured with physical models made from urchin tests with spines in the `up' position (typical in stagnant...
Includes: Multimedia, Supplementary data
Journal Articles
J Exp Biol (2011) 214 (11): 1867–1873.
Published: 1 June 2011
... is that this behavior is aerodynamically inactive and serves to minimize drag. The second is that the tip-reversal upstroke is capable of producing significant aerodynamic forces. Here, we explored the aerodynamic capabilities of the tip-reversal upstroke using a well-established propeller method. Rock dove ( Columba...
Journal Articles
J Exp Biol (2011) 214 (1): 131–146.
Published: 1 January 2011
... blue whale diving drag energetics filter feeding foraging Obligate suspension filter feeding occurs across many different lineages of marine vertebrates that demonstrate convergent specializations for processing vast quantities of small prey items from seawater ( Sanderson and Wassersug...
Includes: Supplementary data