Forthcoming and Online First Articles

International Journal of Aerodynamics

International Journal of Aerodynamics (IJAD)

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International Journal of Aerodynamics (5 papers in press)

Regular Issues

  • Computational modeling of elongated body aerodynamics at variable pitch angles in postcritical flow condition   Order a copy of this article
    by Konstantin Matveev, Miles Wheeler 
    Abstract: Special types of unmanned aerial vehicles are intended to fall unpowered through the air during the initial descent upon release from another aircraft. To predict dynamics of these vehicles in such high-speed falls and later develop means for steering, their aerodynamic characteristics need to be understood. In this work, a cylindrical body is simulated in steady translation through the air in postcritical flow regimes. Validation studies carried out for cylinders with known aerodynamic properties suggested the usage of Detached Eddy Simulation approach with SST k-omega; turbulence model and gamma-transition model. The force and moment coefficients are determined for a rounded-edge cylinder in a range of pitch angles. The drag coefficient initially increases with the pitch angle, but at higher angles the drag variation becomes smaller. The side force demonstrates a well-defined maximum at a medium pitch angle. The aerodynamic moment for inclined body positions tend to force the body into the transverse orientation with respect to the incident flow.
    Keywords: aerodynamics; unmanned aerial vehicles; CFD.

  • Speed Deficit Determination in the Wake of a Darrieus-Troposkien Turbine.   Order a copy of this article
    by Jorge Lassig, Carlos Labriola 
    Abstract: A series of tests on small Darrieus Troposkien Turbine (DTT) was performed in a wind tunnel, to determine the speed deficit and turbulence intensity that adds the wake. These tests are made in order to provide information on the interaction that could result on an array of this type of wind turbines, installed on the roof of a building. The tested turbine had and equatorial diameter of 0.85m and a high of 1.30m. It has with two blades of symmetrical profile NACA 0024. The decrease of rotor speed was 10% with wind speed from 9 m/s to 13 m/s. The turbulence intensity added by the turbine in the wake measured at a distance of one diameter was 0.27, and 0.17 measured at two diameters.
    Keywords: Darrieus; Wake; Speed Deficit; Turbulence intensity.

  • Numerical Simulation of Unsteady Inviscid Flows and Nonlinear Wave Propagation   Order a copy of this article
    by Aaron C. Burkhead, M. Hafez 
    Abstract: The first section of the paper involves developing third and fourth order numerical methods for one and two step schemes. These numerical methods are tested on various benchmark differential equations in order to show they exhibit the desired order of accuracy. Wynns algorithm is also looked at as a method for improving scheme accuracy. In the second part, several concepts common in numerical methods are applied to simple differential equations, namely Burgers equation, Kortweg-De Vries equation, a Burgers-Kortweg-De Vries hybrid equation, the Boussinesq equation, and the Kuramoto-Sivashinsky equation. These were selected because the equations solutions exhibit interesting flow phenomena such as shock wave and soliton propagation. These equations are solved with simple implicit and explicit methods, with a particular linearization technique applied to balance between the nonlinear term and the dissipative/dispersive term.
    Keywords: One and Two Step Methods for ODEs and PDEs; Third and Fourth order accurate schemes; Unsteady Oscillation of Shocks in Nozzles; Burgers’ Equation; Kortweg-De Vries Equation; Boussinesq Equation; Kuramoto-Sivashinksy Equation; Numerical Simulation of Propagation of Shocks and Solitons.

  • Numerical Simulations of Laminar Separated Flows Based on Compressible & Incompressible Navier-Stokes Equations for Engineering Education   Order a copy of this article
    by A. Chuen, M. Hafez 
    Abstract: A simple numerical scheme based on Leap-Frog is developed to solve the Navier-Stokes equations. Methods for balancing the artificial and physical dissipation terms using DuFort-Frankel scheme are discussed. Approaches for restoring time-accuracy for unsteady problems are also considered. Test cases on simple geometries with structured grids are demonstrated for both incompressible and compressible flows. The present work is used to demonstrate the viability of the scheme as an educational tool for CFD in engineering applications with boundary layers and separation.
    Keywords: Numerical Simulation of Separated Flows; Incompressible; Compressible; Steady and Unsteady Flows; Navier-Stokes Equations; Simple Numerical Schemes; Damped Wave Formulation.

  • Study of the flight of the Acer negundo samara   Order a copy of this article
    by Francisco Porritiello, Vicente Javier Nadal Mora, Joaquín Piechocki 
    Abstract: Samaras have been the object of intensive study in recent years. This inspiring aerodynamic rotary decelerator attracts research attention because of its simplicity: it is composed of a thin wing and a concentrated load. Specimens from Acer negundo seeds were taken in two batches to perform experimental measurements and for model configuration, mass properties and aerodynamic characteristics. The samara flight was then characterized by nutation angle, falling and rotation velocities. Then simulations were performed, and their results were compared with those of the experiments. The contrast exercise found that the simulation tool helps predict the behaviour of the flight of samaras. The contributions of this work are to characterize the flight of a particular maple samara belonging to Acer negundo specie, utilizing experimental research and simulations of the samara flight using a simple routine developed for atmospheric decelerators, this last in order to determine the suitability of this tool for this particular application.
    Keywords: rotary wing decelerator; samara seed; rotary wing aerodynamics; Low Reynolds number aerodynamics.