We employ numerical simulation to investigate the hydrodynamics of carangiform locomotion as the relative magnitude of viscous and inertial forces, i.e. the Reynolds number (Re), and the tail-beat frequency, i.e. the Strouhal number (St), are systematically varied. The model fish is a three-dimensional (3D) mackerel-like flexible body undulating with prescribed experimental kinematics of carang...

This article presents a numerical investigation of the pulsatile flow non-Newtonian Casson fluid through rectangular channel with symmetrical local constriction on walls. The objective is to study heat transfer characteristics said under an applied magnetic field and thermal radiation. Such may find its application in devising treatments for stenosis blood arteries, designing biomechanical devi...

We report some experiments undertaken to investigate the origin of ordered and chaotic laminar vortex streets behind circular cylinders at low Reynolds numbers. We made simultaneous measurements of near wake longitudinal velocity and cylinder lateral vibration amplitude spectra for cylinder Reynolds numbers in the range from 40 to 160. For a non-vibrating cylinder the velocity energy spectra co...

As they fly or swim, many animals generate a wake of vortices with their flapping fins and wings that reveals the dynamics of their locomotion. Previous studies have shown that the dynamic interaction of vortices in the wake with fins and wings can increase propulsive force. Here, we explore whether the dynamics of the vortex interactions could affect the predictability of propulsive forces. We...

The present study investigates numerically the phenomenon of vortex-shedding and its suppression in twodimensional mixed convective flow past a square cylinder under the joint influence of buoyancy and free-stream orientation with respect to gravity. The numerical experiments have been conducted at a fixed Reynolds number (Re) of 100 and Prandtl number (Pr) of 0.71, while Richardson number (Ri)...

Purpose This paper aims to analyze the propulsive performance of small-amplitude pitching foils at very high frequencies with double objectives: find out scaling laws for time-averaged thrust and efficiency frequencies; characterize Strouhal number above which effect turbulence on mean values cannot be neglected. Design/methodology/approach The force a NACA0012 foil reduced ( k ) Reynolds Re = ...

Abstract We experimentally investigate the periodic vortex shedding dynamics in a highly oblate Bose–Einstein condensate using moving penetrable Gaussian obstacle. The frequency f v is measured as function of obstacle velocity and characterized by linear relationship = ( ? c ) with being critical velocity. proportionality constant linearly decreased decrease strength, whereas approaches speed s...

This article concerns heat transfer analysis in pulsating flow a channel with walls having multiple symmetric constrictions. The is influenced by Lorentz force and thermal radiation. unsteady governing equations, simplified for low conducting fluids, are solved the finite difference method using stream–vorticity function formulation. effects of emerging parameters, including magnetic field para...

We report direct numerical simulations of a pair wings in horizontal tandem configuration, to analyze the effect their aspect ratio on flow and aerodynamic performance system. The are immersed uniform free-stream at Reynolds number Re = 1000, they undergo heaving pitching oscillation with Strouhal St 0.7. ratios forewing hindwing vary between 2 4. system is dictated by interaction trailing edge...