Particle Image Velocimetry of the underbody flow of generic high-speed trains

Two component Particle Image Velocimetry (PIV) of the underbody flow of three different 1:50 generic high-speed train configurations hauled through a water towing tank over a smooth and a rough ground at a speed of 4 m/s (Re = 0.24 Mio) have been performed. The reference train model (RTM) consisting of 4 cars, features bogies and inter car gaps. All this features are removed for the clean train configuration (CTM), while the open train configuration (OTM) reflects all gaps but no bogies.