Micro-pressure Wave Calculation Using Three Dimensional Compressive Fluid Analysis
We describe three-dimensional analysis of compressive fluid and three-dimensional scale tests to evaluate and verify the pressure gradient of compression waves that are generated when high-speed trains enter tunnels. We introduce an unstructured mesh and a total variation diminishing (TVD) method to improve the accuracy of calculations. A 1/30 scaled model was adopted in both the calculations and experiment. The traveling velocities of the train model ranged between 270 and 320 km/h. The pressure changes in the tunnel during the experiment were measured to verify the calculation results. The experimental results and calculations agreed well with an accuracy of approximately 10 % in both cases with and without a portal hood. We also confirmed that the installation of a portal hood reduced the pressure gradient by approximately 35% because of the increased duration of elevated pressure.
KeywordsPressure Gradient Compression Wave Unstructured Mesh Train Model Train Speed
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- 2.Abe, Y., Morita, K., Terashima, O.: Evaluation of Micro-Pressure Wave Performance in Tunnels by Scaled Model Experiments and Numerical Calculations. In: 17th Transportation Logistics, Japan Society of Mechanical Engineers (2008) (in Japanese)Google Scholar
- 3.Miyachi, T., Iida, M., Ozawa, S.: Optimization of tunnel entarance hood for reducing micro pressure wave from long slab-track tunnel portal. In: 17th Environmental Engineering Symposium, Japan Society of Mechanical Engineers (2007) ((in Japanese)Google Scholar