Malek Abid
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View article: Impact of Circuit Training on Skill Related Neuromuscular Fitness Components (Balance, Coordination and Reaction Time) of Secondary School Level Players; A Quasi-Experimental Single Experimental Group Pretest Posttest Study Design
Impact of Circuit Training on Skill Related Neuromuscular Fitness Components (Balance, Coordination and Reaction Time) of Secondary School Level Players; A Quasi-Experimental Single Experimental Group Pretest Posttest Study Design Open
Health is wealth. Physical fitness is a necessity of living a happy life. Without fitness a blessed life become a curse. Skill related fitness components are part and parcel if playing any game or doing a task accurately and perfectly. The…
View article: Free surface water waves generated by instability of an exponential shear flow in arbitrary depth
Free surface water waves generated by instability of an exponential shear flow in arbitrary depth Open
The stability of an exponential current in water to infinitesimal perturbations in the presence of gravity and capillarity is revisited and reformulated using the Weber and Froude numbers. Some new results on the generation of gravity-capi…
View article: Dispersive Wave Focusing on a Shear Current: Part 1—Linear Approximations
Dispersive Wave Focusing on a Shear Current: Part 1—Linear Approximations Open
We consider the evolution and kinematics during dispersive focussing, for a group of waves propagating atop currents varying with depth. Our analysis assumes long-crested linear waves propagating at arbitrary angles relative to the current…
View article: The superharmonic instability and wave breaking in Whitham equations
The superharmonic instability and wave breaking in Whitham equations Open
The Whitham equation is a model for the evolution of surface waves on shallow water that combines the unidirectional linear dispersion relation of the Euler equations with a weakly nonlinear approximation based on the Korteweg–De Vries equ…
View article: Exploring the Weber dependency of jet fragmentation: a Direct Numerical Simulation investigation
Exploring the Weber dependency of jet fragmentation: a Direct Numerical Simulation investigation Open
Jet fragmentation is investigated through a Direct Numerical Simulation campaign using Basilisk (Popinet & collaborators 2013). The simulations span over one order of magnitude of gaseous Weber numbers (13 to 165), i.e. over the second win…
View article: The superharmonic instability and wave breaking in Whitham equations
The superharmonic instability and wave breaking in Whitham equations Open
The Whitham equation is a model for the evolution of surface waves on shallow water that combines the unidirectional linear dispersion relation of the Euler equations with a weakly nonlinear approximation based on the KdV equation. We show…
View article: Free surface water-waves generated by instability of an exponential shear flow
Free surface water-waves generated by instability of an exponential shear flow Open
The stability of an exponential current in water to infinitesimal perturbations in the presence of gravity and capillarity is investigated. Some new results on the generation of gravity-capillary waves are presented which supplement the pr…
View article: Numerical simulations of the wake and deformations of a flexible rotor blade in a turbulent flow
Numerical simulations of the wake and deformations of a flexible rotor blade in a turbulent flow Open
We present, for the first time, the mean deflection evolution of a flexible rotor blade using a coupled model based on Navier–Stokes equations, for the fluid flow, and linear elasticity equations for the blade deformation. Three turbulence…
View article: Effects of Inrush Current on the Hysteresis Loop and Load Influences on the Transient Current of a Single-Phase Transformer
Effects of Inrush Current on the Hysteresis Loop and Load Influences on the Transient Current of a Single-Phase Transformer Open
When putting any unloaded transformer into service, a high-value current that can be very dangerous, called the inrush current, appears. The latter may cause problems and consequences in the electrical system. The challenges of visualizing…
View article: Generation of Gravity-Capillary Wind Waves by Instability of a Coupled Shear-Flow
Generation of Gravity-Capillary Wind Waves by Instability of a Coupled Shear-Flow Open
The theory of surface wave generation, in viscous flows, is modified by replacing the linear-logarithmic shear velocity profile, in the air, with a model which links smoothly the linear and logarithmic layers through the buffer layer. This…
View article: The Cubic Vortical Whitham Equation
The Cubic Vortical Whitham Equation Open
The cubic-vortical Whitham equation is a model for wave motion on a vertically sheared current of constant vorticity in a shallow inviscid fluid. It generalizes the classical Whitham equation by allowing constant vorticity and by adding a …
View article: Transformation of the Peregrine Breather Into Gray Solitons on a Vertically Sheared Current
Transformation of the Peregrine Breather Into Gray Solitons on a Vertically Sheared Current Open
In this Brief Research Report, we show, within the framework of the nonlinear Schrödinger equation in deep water and in the presence of vorticity (vor-NLS), that the Peregrine breather traveling at the free surface of a shear current of sl…
View article: Multimodal distributions of agricultural-like sprays: A statistical analysis of drop population from a pressure-atomized spray
Multimodal distributions of agricultural-like sprays: A statistical analysis of drop population from a pressure-atomized spray Open
International audience
View article: Wave Breaking in Undular Bores with Shear Flows
Wave Breaking in Undular Bores with Shear Flows Open
It is well known that weak hydraulic jumps and bores develop a growing number of surface oscillations behind the bore front. Defining the bore strength as the ratio of the head of the undular bore to the undisturbed depth, it was found in …
View article: Miles Theory Revisited with Constant Vorticity in Water of Infinite Depth
Miles Theory Revisited with Constant Vorticity in Water of Infinite Depth Open
The generation of wind waves at the surface of a pre-existing underlying vertically sheared water flow of constant vorticity is considered. Emphasis is put on the role of the vorticity in water on wind-wave generation. The amplitude growth…
View article: Transverse instability of gravity–capillary solitary waves on deep water in the presence of constant vorticity
Transverse instability of gravity–capillary solitary waves on deep water in the presence of constant vorticity Open
The bifurcation of two-dimensional gravity–capillary waves into solitary waves when the phase velocity and group velocity are nearly equal is investigated in the presence of constant vorticity. We found that gravity–capillary solitary wave…
View article: Whitham approach for the study of nonlinear waves on a vertically sheared current in shallow water
Whitham approach for the study of nonlinear waves on a vertically sheared current in shallow water Open
Two-dimensional nonlinear gravity waves travelling in shallow water on a vertically sheared current of constant vorticity are considered. Using Euler equations, in the shallow water approximation, hyper-bolic equations for the surface elev…