Sobhi Frikha

Numerical Simulation of the Overlap Effect on the Turbulent Flow Around a Savonius Wind Rotor

This study aimed to investigate the effect of the overlap on the aerodynamic characteristics of the flow around a Savonius wind rotor. A numerical simulation was developed using a commercial CFD code. The considered numerical model is based on the resolution of the Navier–Stokes equations in conjunction with the k-e turbulence model. These equations were solved by a finite volume discretization method. We were particularly interested in visualizing the velocity field, the mean velocity, the static pressure, the dynamic pressure, the turbulent kinetic energy, the dissipation rate of the turbulent kinetic energy, and the turbulent viscosity. The comparison of the numerical results with previous results shows a good agreement.

Study of the Incidence Angle Effect on a Savonius Wind Rotor Aerodynamic Structure

This study aimed to investigate the effect of the incidence angle on the aerodynamic characteristics of the flow around a Savonius wind rotor. Six configurations with different incidence angles θ = 0°, θ = 30°, θ = 60°, θ = 90°, θ = 120°, and θ = 150° were studied. To this end, we have developed a numerical simulation using the computational fluid dynamic (CFD) code “Fluent.” The considered numerical model is based on the resolution of the Navier–Stokes equations together with the k–e turbulence model. These equations were solved by a finite volume discretization method. Particularly, we were interested in visualizing the velocity field, the mean velocity, the static pressure, the dynamic pressure, the turbulent kinetic energy, the dissipation rate of the turbulent kinetic energy, and the turbulent viscosity. Our results confirm that the variation of the incidence angle has an effect on the local characteristics. Our numerical results were compared with those obtained by previous findings. The comparison showed a good agreement and confirmed the efficiency of our numerical method.

Numerical Study of the Fluid Characteristics Effect on the Penetration of a Negatively Buoyant Jet

The behavior of a negatively buoyant jet in laminar conditions that result from the injection of lighter fluids downwards into a large container of homogeneous fluid of denser density was studied numerically using OpenFoam with the finite volume method. The fluid characteristics effect on the evolution of the pure water injected in the tank full of salt water has been investigated particularly the molecular diffusivity that affects the mixing layer, the relative difference of density between two liquids, and the kinematic viscosity of the salt water that has an important effect in the transient phase as well as the subsequent steady state in terms of stationary penetration depth and jet profile.

Experimental Study of the Injection of a Pure Water Jet in Miscible Salt Water

In this chapter, some experiments were performed to observe the evolution of a pure water jet injected with negatively buoyant conditions in a miscible surrounding salt water in a laminar regime. The effect of the flow rate and the relative difference of density between the pure water jet and the surrounding salt water were examined. In these conditions, the increase of the penetration depth of the jet is obtained by the increase of the flow rate and the decrease of the density difference between the two liquids. A good agreement was found between the numerical and the experimental results.

Incidence Angle Effect on the Turbulent Flow around a Savonius Wind Rotor

This study aims to investigate the effect of the incidence angle on the aerodynamic characteristics of the flow around a Savonius wind rotor. Six configurations with different incidence angles equal to θ=0°, θ=30°, θ=60°, θ=90°, θ=120° and θ=150° were studied. For this, we have developed a numerical simulation using the Computational Fluid Dynamic (CFD) code Fluent. The considered numerical model is based on the resolution of the Navier-Stokes equations in conjunction with the k-e turbulence model. These equations are solved by a finite volume discretization method. Particularly, we are interested in visualizing the velocity field, the mean velocity, the static pressure, the dynamic pressure, the turbulent kinetic energy, the dissipation rate of the turbulent kinetic energy and the turbulent viscosity. Results confirm that the variation of the incidence angle has an effect on the local characteristics. Our numerical results were compared with those obtained by anterior results. The comparison shows a good agreement and confirms the numerical method.