Abstract
Aerodynamic noise is generated by interaction of the air flow with an object and within the turbulent flow itself. In railways it becomes an important noise source for speeds above 250 kph and major areas of noise generation on trains, in particular high speed trains, are the train head, the leading and second bogie, the pantograph and the gaps between trailers. In this presentation a numerical simulation approach based on CFD/CAA techniques aiming to predict aerodynamic noise of different components of SNCF's TGV high speed trains. The approach is based on an unsteady DES flow simulation combined with the Ffowcs-Williams and Hawkins (FW-H) analogy for the acoustic part. In order to develop the method different models are implemented and the leading bogie was selected as an application case. A simplified symmetric model will be compared against a full, higher resolved model in order to see if computation time gains are feasible. Results of this simulation, in terms of sound power and directivity, are already used by SNCF noise experts in order to estimate pass-by noise levels of TGV high speed trains. Furthermore, noise mitigation solutions can be tested virtually with the suggested approach before being tested with a prototype.
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