Per ELOFSSON
SCANIA CV AB, Fluid Mechanics
Aerodynamicist
Abstract
This lecture will describe the role of experimental fluid dynamics in the design process for automotive vehicles. In addition, the lecture will present an overview of truck aerodynamics and highlight the differences compared with passenger car aerodynamics.
Wind tunnels designed for automotive testing will be presented and the function of the wind tunnel systems that are specific for vehicle aerodynamics will be explained. Traditionally, experimental methods for automotive testing have been aimed at flow visualization and direct force measurements using an external or internal force balance. In today's vehicle testing, balance measurements are often used together with pressure and velocity field measurements. The additional pressure and velocity data are used in wake-analysis methods and the results help to identify which vehicle regions that need to be improved.
Examples from project and research work at Scania will be used to illustrate the topics above.
Simone SEBBEN
Senior CFD engineer - Volvo Car Corporation, Fluid Dynamics Center
Abstract
CFD is today an important tool in the vehicle industry around the world. At Volvo Car Corporation, CFD has become an integral part of the engineering and design optimization process. More and more CFD is used as a tool to help making project decisions and not only serve as support or input to physical testing. The CFD group at Volvo Car Corporation supports project decisions with virtual development in the following areas: aerodynamics, dirt and snow deposition, aeroacustics, thermodynamics and climate systems .
A general overview of CFD at Volvo Car Corporation today will be presented. Tools and methods used for aforementioned applications will be discussed. Special attention will be given to aerodynamics in the vehicle development process. How do we make an impact on the product using CFD? A short description of some of our current and future research topics will also be presented.
Dr. Alexander Orellano
Bombardier
Manager, Center of Competence for Aerodynamics & Thermodynamics
Abstract
High-speed trains exhibit many complex flow features: reverse-flow regions,
cavities and stagnation points in the gangway and bogie region, laminar-turbulent
transition in the nose region, turbulent boundary layer development, separation
and re-attachment as well as Kàrmàn-vortex streets at the pantographs
contact strip are some examples.
New European legislation is forcing high speed rail manufacturers to reduce the
aerodynamic loads on the surrounding infrastructure, on people waiting at platforms
and on workers at the track. Furthermore, it is the aerodynamic noise which is
the dominant noise source on high-speed trains.
Thus, aerodynamics is nowadays an indispensable topic in the rail industry. This
lecture will address the most critical aerodynamic issues during the development
of a high-speed train including cross-wind stability, head pressure wave generation,
slip stream effect and aeroacoustics. Available methods and their suitability
for the determination of the aerodynamic performance will be discussed, i.e.
analytical equations, Computational Fluid Dynamics (CFD), scaled model testing
in wind tunnels and testing on the train itself.
Luciano MARIELLA
FERRARI F1 GeS
Head of CFD group.
Abstract
General overview on the main mathematical models available for CFD external aero simulations: Navier-Stokes, Eularian, Panel method, etc.
Main features, requirements and limits for each mathematical model, focusing the attention on the applicability to a realistic F1 car shape.
Close-up to the "Reynolds Averaged Navier-Stokes" model: mesh generation requirements, available turbulence models, precision, reliability and repeatability of numerical test.
Practical examples of CFD use inside the Aerodynamic Technical Office of Ferrari GeS: full car external aero simulations, wings development and improvement, thermal problems (like exhausts gas and brake cooling).
Realistic future developments for the CFD tools applied to the aerodynamic project of F1 car.