Chapter 5

The flow around trains in the open air


This chapter gives an introduction to the flow around trains in the open air and provides the basic description of the flow field on which the discussion of the applications in Part 2 is based. The discussion is built on the results of full-scale experiments, for a wide range of different train types, with data from model-scale experiments and computational fluid dynamics being used where no full-scale data are available. Firstly, the flow around trains on level ground is discussed, and the five basic flow regions are introduced – the nose region, the boundary layer region, the near wake region, the far wake region and the underbody flow region. Each of these regions is then analysed in turn, ...

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