Flow Around Vehicles Under the Influence of Side Winds
|Cooperation:||Scania, Bombardier Transportation, ANSYS Fluent Sweden|
|Sponsors:||Vinnova, Scania, Bombardier Transportation, ANSYS Fluent|
|Start of project:||August 2003|
Many traffic accidents are caused by side winds. These accidents can be collisions caused by substantial vehicle course deviations, the overturning of the vehicles or derailment accidents. It is well known that the shape of the vehicle determines the influence of the side winds on the vehicle stability. Thus the vehicle's side wind resistance can be improved by the adjustment of its design. This task requires thorough understanding of the flow around vehicles under the influence of side winds. Previous experimental studies have concentrated mainly on the vehicle's response to the side winds and not much on the understanding the flow mechanisms.
This project aims to study the influence of the side winds on the road and rail vehicles such as trains, trucks and buses. We are using time-dependent numerical technique (large eddy simulations) to accurately predict the flow and to study its development in time. Two generic geometries will be studied during the project. First the geometry of a simplified train body will be used following by a simplified truck geometry. Results of numerical simulations will be compared with the existing experimental data and with observations of the flows around real trains and trucks. The project will establish accurate picture of the flow around vehicles and provide explanations for the flow mechanisms that are influencing vehicles. This research will hopefully help the engineers and designers to improve the resistance of the vehicles to side winds.
This page, Computational Aero-Acoustics for Vehicle applications, should be part of a frames system at www.tfd.chalmers.se/~lada/projects/proind.html