Examinando por Autor "Vaca Ríos, John Jairo"
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- ÍtemAnálisis aerodinámico computacional de dispositivos de punta de ala en la aeronave Vultur(Fundación Universitaria Los Libertadores. Sede Bogotá., ) Torres Suárez, Dina Vanessa; Rojas Olaya, Deisy Janeth; Vaca Ríos, John JairoThis project contains the step-by-step procedure of the analysis and comparison of results through the use of Computational Fluid Dynamics (CFD) whose main purpose is to determine which of the three configurations designed (wing clean, wing winglet, wing tiptank) for the Vultur aircraft allows to obtain greater performance and efficiency taking into account the needs under which it was designed based on the requirements established by FAC (Fuerza Aérea Colombiana). In turn, the theoretical foundations of the CFD will be shown in general, used as a fundamental basis in the development of the project, in addition the design characteristics determined for the prototypes and their elaboration in 1:10 scale will be observed that will allow a clearer guide to the objects of study of the project throughout its development. This report will provide tables and figures that show the analysis process at each stage, which were essential to determine which of the three configurations provided better performance and efficiency of the Vultur aircraft, from which it was established that the wing winglet provides a better contribution to the aircraft in terms of the study parameters. Finally, the conclusions obtained at the end of this project and recommendations for future research projects based on the design and aerodynamic analysis of wingtip devices or improvement of the results obtained will be presented.
- ÍtemAnálisis del arrastre aerodinámico de un casco de ciclismo competitivo mediante simulación numérica usando el software OpenFOAM®Herrera Quilaguy, Diego Alexis; Vaca Ríos, John JairoThis work comes from an investigation carried out by the RMIT University (Royal Melbourne Institute of Technology University) named “Aerodynamics of ribbed bicycle racing helmets"; where they made an aerodynamic study of competitive cycling helmets, that possess dimples, smooth and ribbed surfaces; this in order to understand the aerodynamic performance of each one of them. This type of investigation was carried out in a closed circuit wind tunnel in the RMIT, through a wide range of wind speeds, pitch and yawing angles. Therefore, the aim of this work is to study the Giro Air Attack helmet and make a comparison of results obtained by a numerical computational simulation Vs experimental information taken from the guide article. It has been made an analysis by Computational Fluid Dynamics (CFD), using a design represented by Computer Aided Design (CAD) obtained by the collaboration with “Tecnoparque SENA, Nodo Bogotá", where was developed a 3D scanning of the Giro Air Attack helmet of the same reference of the experimental study. Was used a software CFD called OpenFOAM for bring the simulation off and prove that the mathematics and turbulence models used have obtained approximate information and in this way determine the performance of the selected model.
- ÍtemAnálisis numérico del flujo turbulento sobre el perfil Naca 1408Martínez Calderón, Daniel Jesús; Vaca Ríos, John JairoSimulation technology in engineering is a fundamental part of the innovation required by modern industry. Because virtual reality will become solutions for human needs, such simulations must be reliable and accurate. The present document reflects the fidelity of a numerical analysis validating results of experimental tests carried out years ago in a wind tunnel on an aerodynamic profile. In this process, understanding the physical principles of turbulence and proper modeling of the turbulent tensor is absolutely necessary because there are different paths to follow and this is where much of the success lies. The model chosen for the validation was the SST k-w after understanding its legacy of averaged equations and its foundation in the Boussinesq assumption, added to terms such as the transport equation for turbulent kinetic energy, the mixing functions and closing coefficients. Throughout this validation process, understanding how the numerical method of finite volume works and the management of algebraic equations, is also key to avoiding the use of the computational tool as a black box that delivers results with errors or inaccuracies that undermine confidence in the quality of the analysis performed
- ÍtemCaracterización aerodinámica de un tractocamión(Fundación Universitaria Los Libertadores. Sede Bogotá., ) Garzón Hernández, Bryan Steven; Murillo Castellanos, Jhonatan Yesid; Vaca Ríos, John JairoThe present investigation was made with the objective of aerodynamically characterizing the truck, implementing aerodynamic complements by altering the air ow that passes over the surface of the truck, influencing the pressure coefficient, aerodynamic drag and other aerodynamic phenomena that occur affecting its performance. A scientific method was implemented, selecting the prototype from reports of cargo vehicles in Colombia published by FENALCO and ANDI between 2017 and 2018, after the truck design and the aerodynamic complements were made in the Solid Edge ST9 software which were manufactured on a scale of 1: 21.3. The manufacture of the cabin, rims and complements was made by 3D printing and the trailer in balsa wood and MDF, using the technique of serial plan. After the model was fabricated, experimental tests were carried out in the wind tunnel of the Fundación Universitaria Los Libertadores. Initially, tests were carried out with the standard truck and afterwards different aerodynamic kits were implemented, obtaining as a result the pressure coefficient distribution figures through the upper section of the vehicle. Flow visualization tests were carried out by means of injected smoke and mercerized cotton (tufts), with this it was possible to show how was air behavior on the truck, identifying the critical points that affected it aerodynamically speaking. Additionally, an aerodynamic - mathematical analysis was carried out, concluding which complement offered a greater percentage of reduction in critical points of the pressure coefficient, thus increasing the aerodynamic efficiency of the truck. On the other hand, this test was able to verify and compare the data obtained and plotted in the tests mentioned above, finally concluding that the Kit that offered the best performance and therefore greatly reduced a critical point in the pressure coefficients on the tractocamión was Kit 1.
- ÍtemDiseño de un alerón delantero para un kart de competencia mediante CFDPacheco Martínez, Karen Gisell; Rojas Sarmiento, Oscar Daniel; Vaca Ríos, John JairoThe following document shows the analysis, redesign and aerodynamic validation processes of a competition kart through the Computational Fluid Dynamic with the purpose of evaluating its performance before and after of the realized modification to its original design and thus improve its performance during a competition. Based on the CFD theory and orienting this same to one of its most common uses, like is the external flow study around a car; modeling of the kart was carried out using the Solid Edge software and Inventor software, one of these modeling was using the common design and the other was using an incorporated aileron, this aileron was made through an aerodynamic airfoil chosen for its efficiency using the XFLR-5 software. Later, through the Ansys Workbench 19 software the computational domain was designed, taking into account different meshing settings, boundary conditions and solution methods; then, a series of results were obtained for each kart modeling and then, through analysis, a final conclusion could be established taking into account the perspective of different academic articles with related topics. Also, recommendations and necessary suggestions are provided to carry out
- ÍtemDiseño y fabricación de un vehículo aéreo no tripulado con energía solar para misiones de vigilancia civil(2016) Pedraza Betancourth, Nelson Javier; Parra Villamarín, Julio Enoc; Vaca Ríos, John Jairo; Bravo Mosquera, Pedro David; Cerón Muñoz, Hernán DaríoCon el fin de promover el desarrollo de las energías renovables y aprovechar las nuevas tecnologías en beneficio de la sostenibilidad, se presentan tanto el diseño como las metodologías de fabricación de un vehículo aéreo no tripulado experimental con energía solar para aplicaciones de vigilancia civil. A lo largo del documento, se proporciona el proceso histórico en torno al desarrollo de la aeronave. Por lo tanto, en la primera parte se muestra el diseño aerodinámico, que incluye los análisis 2-D y 3-D de la plataforma del ala mediante métodos numéricos y experimentales, el diseño analítico de la configuración del empenaje y las principales características del desempeño. análisis. Además, se describen los principales sistemas y componentes que caracterizan a la aeronave, como la configuración de las células solares fotovoltaicas, así como la electrónica y el sistema de control en el vehículo aéreo no tripulado. Por último, el modelado para la distribución de pesos de los componentes se realizó en una prueba preliminar utilizando herramientas CAD. Así, se obtuvo un proceso adecuado para la fabricación del vehículo aéreo no tripulado, considerando que la finalidad de la aeronave es ser lo más ligera y aerodinámica posible para cumplir con la misión para la que fue creada.
- ÍtemEstudio aerodinámico de un avión de alta relación de aspectos usando CFDSandoval Garzón, Ernesto; Vaca Ríos, John Jairo
- ÍtemMetología para realizar pruebas aerodinámicas en prototipos a escala de vehículos de la competencia Shell Eco-Marathon(Fundación Universitaria Los Libertadores. Sede Bogotá., ) Osorio Muñoz, Henry Fernando; Vaca Ríos, John JairoThe present proyect search develop and standardize a methodology with the objective to do aerodynamic testing in Shell Eco-Marathon vehicles, the aerodynamic optimization in this kinds of automobiles is one of the most important aspect to achieve the best score and the first positions; thus, the results of this research are will be useful in the design and optimization vehicles phases. In first instance, it does a thorough review to relevant aerodynamic concepts to measure of aerodynamic vehicle drag, design a scale prototype to be used subsonic wind tunnel testing; use different techniques to know the aerodynamic behavior of the vehicle and in turn, measure the distribution of pressure coefficients above the scale model that allow to estimate the actual vehicle drag. The prototype desing was develop by mechanical engeenering students of the Libre University, the velocity range used for the testing are 9km/h, 15 km/h y 20 km/h respectively. The experimental findings indicate that the testing methodology using scale prototype is a good tool to optimization for any vehicle model that belong to this kind of competition.
- ÍtemPredicción numérica del ruido generado por un tren de aterrizaje frontal simplificado(Fundación Universitaria Los Libertadores. Sede Bogotá., ) Angarita Pérez, Luis Felipe; Rodriguez Ávila, Miguel Ángel; Vergara Pineda, Juan Martín; Vaca Ríos, John JairoUsing multiple numerical experiments, the aerodynamic performance and the acoustic response of the ow colliding with a simpli ed front landing gear are characterized at Mach and Reynolds numbers of 0.23 and 1;54 106 respectively, using a RANS technique such as the Spalart-Allmaras model of turbulence. The calculations are made with multiple three-dimensional meshes of up to 3.3 million elements. The acoustic response for each of the simulated cases is evaluated in the near and far eld by means of the solution of the Ffowcs Williams-Hawkings equation and is compared with the results obtained by the scienti c community. The curves and contours of mean velocity and RMS velocity show a behavior similar to that found by other authors, and the values of the sound pressure levels present the trend reported by other researchers in the near eld; however, far eld sound pressure level values are a ected by the numerical techniques used. Regarding the comparison between the two di erent LAGOON con gurations, no obvious variation was found.