Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
AERODYNAMIC INVESTIGATION OF A MIRA FASTBACK MODEL GEOMETRY USING CFD TECHNIQUES BASED ON EXPERIMENTAL WIND TUNNEL ANALYSIS
Submission Author:
Luckyan Quintino , PR
Co-Authors:
Luckyan Quintino, Jorge Chavez , Leonel R Cancino
Presenter: Leonel R Cancino
doi://10.26678/ABCM.ENCIT2022.CIT22-0225
Abstract
Aerodynamics are a high applicability type of science, used in the development of automobiles, airplanes and even considered in the design of great infrastructures such as tall buildings and bridges. On the rise of the computer era, some software packages were developed to calculate the impact of fluid dynamics on virtual bodies without manufacturing a prototype or using a wind tunnel. The engineers working in this area are now able to study those effects in a less expensive way, which also contributed for more development on the products and Computer Fluid Dynamics (CFD) software. Nowadays in Brazil, fuel prices had increased considerably, and this kind of situations normally highlight fuel efficient of cars. Although a low drag coefficient is possible, it’s not always achievable in a car project because the air flow around the body also has direct impact in the vehicle stability as well as in noise generation, both vital to the success of the car as a product in safety and comfort categories. The MIRA reference geometries were developed after production models of the early 80’s initially with three rear body type variation: fastback, notchback and estate-back/wagon and were firstly introduced to calibrate wind tunnels using scale models and full-sized models, those geometry also became a great reference for CFD software validation some decades later. In this work, the MIRA reference fastback type model was numerically investigated. Its geometry differs in the rear with a smooth transition between the roofline and the rear end of the body, eliminating the three-volume characteristic of a traditional sedan body. Generally capable of generating less drag due to a smaller wake formation, the fastback body type is usually associated with sportive kind of cars. In this work, Mesh and computational domain independency test were then performed to guarantee reliable numerical data. The obtained fluid flow pattern, using the commercial ANSYS FLUENT software, is then discussed in terms of aerodynamic behavior and compared to experimental data available at the literature. The set-up was built using the wind tunnel experimental data available at the literature. Several turbulence models were tested to compare and validate the numerical results as well as numerical procedures.
Keywords
fluid dynamics, CFD, MIRA Fastback body, Aerodynamic Behavior
