flow structure and heat transfer characteristics around two-equal in-tandem square cylinders in the two dimensional laminar and turbulent flow regimes are simulated numerically for reynolds and prandtl numbers, re=1-1×10 5 , pr=0.71, respectively. the investigation is based on an implicit finite volume scheme for integrating the unsteady navier-stokes equations and use of standard κ-ε model to ...

The tail (caudal fin) is one of the most prominent characteristics of fishes, and the analysis of the flow pattern it creates is fundamental to understanding how its motion generates locomotor forces. A mechanism that is known to greatly enhance locomotor forces in insect and bird flight is the leading edge vortex (LEV) reattachment, i.e. a vortex (separation bubble) that stays attached at the ...

Asymptotic approximations for small Strouhal number are derived for the solution of the problem of the interaction between an acoustic wace and a subsonic jet flow issuing from a semi-infinite pipe. Density and sound speed differences between the jet flow and the (slowly moving) ambient medium, and a general edge condition are included. The approximations relate to the field inside the jet flow...

Three-dimensional fully unsteady computational fluid dynamic simulations of five Olympic-level swimmers performing the underwater dolphin kick are used to estimate the swimmer's propulsive efficiencies. These estimates are compared with those of a cetacean performing the dolphin kick. The geometries of the swimmers and the cetacean are based on laser and CT scans, respectively, and the stroke k...

Generation of Alfvénic (magnetohydrodynamic) vortices by the interaction of compressible plasma flows with magnetic-field-aligned blunt obstacles is modeled in terms of magnetohydrodynamics. It is found that periodic shedding of vortices with opposite vorticity is a robust feature of the interaction in a broad range of plasma parameters: for plasma beta from 0.025 to 0.5, and for the flow speed...

In the investigations of fish swimming, relationship between swimming and corresponding characteristics flow field attracts lots attention. this paper, influence different Strouhal numbers on mechanical fish-like body is investigated. It found that strength anti-Karman vortex thrust are affected by number. When number small, coefficient small but propulsion efficiency high. Similarly, when larg...

Two-dimensional viscous incompressible flow past five generic bridge deck cross sections are investigated by means of the discrete vortex method. The analyses yields root mean square lift coefficients and Strouhal numbers for fixed cross sections and aerodynamic derivatives for the cross sections undergoing forced oscillatory cross wind and twisting motion. Fair agreement is established between...

Levantoniscus n. gen. is erected for two new species from Cyprus: Levantoniscus bicostulatus n. sp. and Levantoniscus makrisi n. sp. Levantoniscus wahrmani (Strouhal, 1968) n. comb. from Israel and southern Turkey is transferred from the genus Bathytropa Budde-Lund, 1885 and family Bathytropidae. The new genus is included in the family Trachelipodidae and is characterized by distinct dorsal orn...

This work focuses on vortex-within-a-vortex (VV) structures behind three different shapes of forked caudal fin with a heaving-pitching motion. The results show that the synchronization trailing-edge vortex separation and shedding leading-edge contributes to generation VV structure. fins chord lengths can be observed almost simultaneously. Strouhal number not only determines vortices in wake but...