A high-speed train entering a tunnel will generate large pressure fluctuations. In recent decades, different design methods have been developed for the prediction of such pressure fluctuations. However, many of the design methods are developed for specific cases and are generally not applicable for other situations. This paper is intended to outline a simplified design method using the commercially available Computational Fluid Dynamics (CFD) code FLUENT [1] for the prediction of the pressure fluctuations at the portal entry stage. Comparison with published Japanese fall scale test data [5] and other widely acceptable empirical equations are provided and the results are found to be consistent with the outlined simplified design method.
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