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International Journal of Aerodynamics (6 papers in press)
Computational Study of aerodynamic performance and flow structure around NACA 23012 wing by James Dent, Joshua Robson, Alessio Basso, Alexander Ellin, Atma Prakash, Faik Hamad Abstract: The structure of the external flow field around the wing of a Lobet Ganagobie light aircraft is investigated in this paper by using Computational Fluid Dynamics method (CFD). A model has been developed to mimic the NACA 23012 geometry and used to simulate the flow around it. A wind tunnel is used to collect new experimental data for lift coefficient to verify the accuracy of the model at Reynolds numbers, Re = 0.3 x 106. Then, the CFD model is utilised to produce velocity streamline plots and pressure and velocity contours at hiher Re number (2 xl06 3 x 106) to have a better understanding of the flow around Lobet Ganagobie wing model. rnThe turbulence model is selected based on the comparison of experimental data with results from different CFD models. Driven by the abrupt stalling characteristics of the NACA 23012 airfoil section, the model is used to predict the position of the stagnation point on the airfoil so that a stall waning device can be sensibly located. rn Keywords: CFD simulation; finite wing; lift coefficient; drag coefficient; stagnation point; flow separation.
Design of an external six-component wind tunnel balance with floating frame by Miguel Angel AGUIRRE, Ramiro Bracco, Fabio Milanese, Matias Meroniuc Abstract: This paper details the design procedure of a wind tunnel aerodynamic balance. It is the six-component external balance with floating frame used in our main Eiffel-type wind tunnel. This balance has the unique feature of being able to receive full and half wind tunnel models. Firstly, a set of design requirements and specifications is defined. Then the conceptual and detailed design of the mechanism is deeply explained. Finally, an analytical model of the balance is developed and used in order to study the effect of the design loads: this allowed sizing of the load cells and the counterweights of the balance. Keywords: experimental aerodynamics; wind tunnel; external balance; floating frame; half model; full model; design procedure; force measurement.
Numerical simulations of transonic flows with non-unique solutions by A.M. Chuen, M.M. Hafez Abstract: Inviscid, compressible flows are described by a first-order system of hyperbolic partial differential equations in conservation form, and are solved numerically with simple schemes. These schemes show the ability to reproduce well-known solutions adn benchmarks for the two-dimensional Euler equations. Finally, the schemes are used to explore the anomaly of non-unique solutions in the transonic regime. Furthermore, numerical solutions for the isentropic Euler equations.... Keywords: Transonic Flows; Euler Equations; Isentropic Euler Equations; Numerical
Schemes; Non-unique Solutions; OVERFLOW.
Visualisation of inviscid transonic flows using a water table by A. Burkhead, M. Hafez Abstract: The analog of compressible inviscid flows and shallow water surface waves are studied via water table experiments. In particular, the non-uniqueness problems of transonic flows in nozzles and around airfoils are examined numerically and experimentally. Qualitative comparisons of the two results are shown for several cases. Keywords: hydraulic analogy; water table; non-unique solutions; transonic flows.
Effectiveness of Tail Devices for Wake Control of Road Heavy Vehicles by Mohammad Saeedi, Ali Tarokh, Kefu Liu Abstract: In the current research, a series of numerical simulations of the flow field around a typical tractor-trailer combination with and without a drag reduction device (i.e. boat tail) have been performed to study the effect of the device on wake structures and flow evolution behind the trailer. The results of the simulations have been validated through the comparison of the drag coefficient against available wind-tunnel measurement data. Based on the evolution profiles and flow visualization behind the trailer, it has been shown that the trailer wake region in proximity of the trailer rear surface is significantly influenced by the trailer boat tail. As such a quicker flow recovery, smaller recirculation bubble, and lower level of turbulent kinetic energy are obtained when the boat tail is utilized. This resulted in about 8.6% decrease in vehicle aerodynamic drag and 4.6% fuel saving based on the traveling speed of 65 mph. Keywords: Drag Reduction Devices; Aerodynamics of Heavy Truck; Wake control; Boat Tail;.
Computational modeling of elongated body aerodynamics at variable pitch angles in postcritical flow condition 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.