Numerical study of the thunniform mode of fish swimming with different Reynolds number and caudal fin shape

2012 ◽  
Vol 68 ◽  
pp. 54-70 ◽  
Author(s):  
Xinghua Chang ◽  
Laiping Zhang ◽  
Xin He
Keyword(s):  
Reynolds Number ◽  
Numerical Study ◽  
Fish Swimming ◽  
Caudal Fin ◽  
Caudal Fin Shape ◽  
Fin Shape

Grammatonotus bianchi, a new species of splendid perch (Percoidei: Callanthiidae) from Myanmar, northeastern Indian Ocean

Zootaxa ◽  
2021 ◽  
Vol 4996 (3) ◽  
pp. 513-524
Author(s):  
MARK W. LISHER ◽  
HTUN THEIN ◽  
PETER N. PSOMADAKIS
Keyword(s):  
New Species ◽  
Indian Ocean ◽  
Andaman Sea ◽  
Caudal Fin ◽  
Large Head ◽  
Caudal Fin Shape ◽  
A New Species ◽  
Fin Shape

A new splendid perch, Grammatonotus bianchi sp. nov. is described on the basis of two specimens (45.9–68.7 mm SL) collected at 184 m depth in the Andaman Sea off the coast of Myanmar during bottom surveys conducted by the R/V Dr Fridtjof Nansen in 2018. The new species can be distinguished from all congeners by its large head (37.7–38.6% SL), large orbit (14.4–15.3% SL), caudal-fin shape, and fresh coloration. A key to Indian Ocean species of Grammatonotus is provided.  

Ontogeny of head and caudal fin shape of an apex marine predator: The tiger shark (Galeocerdo cuvier)

2016 ◽  
Vol 277 (5) ◽  
pp. 556-564 ◽  
Author(s):  
Amy L. Fu ◽  
Neil Hammerschlag ◽  
George V. Lauder ◽  
Cheryl D. Wilga ◽  
Chi-Yun Kuo ◽  
...  
Keyword(s):  
Tiger Shark ◽  
Caudal Fin ◽  
Marine Predator ◽  
Galeocerdo Cuvier ◽  
Caudal Fin Shape ◽  
Fin Shape

Impact of Caudal Fin Shape on Thrust Production of a Thunniform Swimmer

2020 ◽  
Vol 17 (2) ◽  
pp. 254-269
Author(s):  
Alexander Matta ◽  
Hodjat Pendar ◽  
Francine Battaglia ◽  
Javid Bayandor
Keyword(s):  
Caudal Fin ◽  
Caudal Fin Shape ◽  
Thrust Production ◽  
Fin Shape

A numerical study of the transition of jet diffusion flames

1990 ◽  
Vol 431 (1882) ◽  
pp. 301-314 ◽  
Keyword(s):  
Reynolds Number ◽  
Diffusion Coefficient ◽  
Large Scale ◽  
Numerical Study ◽  
Small Scale ◽  
Surface Model ◽  
Flame Surface ◽  
Transition Mechanism ◽  
Air Stream ◽  
Scale Fluctuation

A numerical study on the transition from laminar to turbulent of two-dimensional fuel jet flames developed in a co-flowing air stream was made by adopting the flame surface model of infinite chemical reaction rate and unit Lewis number. The time dependent compressible Navier–Stokes equation was solved numerically with the equation for coupling function by using a finite difference method. The temperature-dependence of viscosity and diffusion coefficient were taken into account so as to study effects of increases of these coefficients on the transition. The numerical calculation was done for the case when methane is injected into a co-flowing air stream with variable injection Reynolds number up to 2500. When the Reynolds number was smaller than 1000 the flame, as well as the flow, remained laminar in the calculated domain. As the Reynolds number was increased above this value, a transition point appeared along the flame, downstream of which the flame and flow began to fluctuate. Two kinds of fluctuations were observed, a small scale fluctuation near the jet axis and a large scale fluctuation outside the flame surface, both of the same origin, due to the Kelvin–Helmholtz instability. The radial distributions of density and transport coefficients were found to play dominant roles in this instability, and hence in the transition mechanism. The decreased density in the flame accelerated the instability, while the increase in viscosity had a stabilizing effect. However, the most important effect was the increase in diffusion coefficient. The increase shifted the flame surface, where the large density decrease occurs, outside the shear layer of the jet and produced a thick viscous layer surrounding the jet which effectively suppressed the instability.

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