The influence of the aerodynamics on small objects around the high speed trains
|Start of project:||January 2005|
The aim of this project is to investigate how the aerodynamic effects caused by the flow around the high speed train influence small objects in the vicinity of the train. During last few years, large number of damages on the trains caused by the stones and other smaller objects below and around them have been observed. Also in Sweden several damages have been reported on the Swedish high-speed trains Regina and X2000. These were attributed to the flying objects. The damages were broken windows and imprints on the train body. Both these trains have top speed between 180 - 200 km/h. The possible explanation for these damages is that the train lifts the stones from the ground which then hit the train.
There are two possible explanations for this phenomena:
The first study aims to identify the important mechanisms in the flow around trains that can produce flying objects (such as stones) causing damages on trains. We shall use the time-dependent simulations such as Large Eddy Simulations and unsteady RANS simulations. The results of simulations will be used to determine the time-dependent forces around the trains and to explain the mechanisms that can produce flying stones around the trains. The knowledge obtained in this project will be used to improve our understanding of the flows around trains and to help engineers to design better trains and railways
Preliminary simulations have been carried out. Below one instants when a stone hits the underbody of the train is shown.