Validation
Each release of TNT is validated with several experimental data and in particular with the results of the European research program Transaero (BRITE/EURAM project TRANSAERO – A European initiative on transient aerodynamics for railway system optimisation, Springer, 2002).
HIgh speed train: Terranuova Tunnel
TNT reproduces with an excellent precision the unsteady flow-fields generated by the high-speed trains passing in the Terranuova Le Ville tunnel, located on the Italian line Florence-Arezzo (double track tunnel of 2'707 m length).
On the left, two ETR500 trains travelling at 280 km/h, pressures on the middle of the car (mobile point). On the right, pressure evolution at the center of the tunnel induced by a single ETR500 train traveling at 280 km/h (fixed point)
medium speed train: Tunnel de Stanton
Excellent agreement is obtained in the Stanton tunnel test case, where the simulated (blue) and measured (black) pressure flow-fields are evaluated for an APT-E train moving at 220 km/h.
Comparison between experimental (black) and computed with TNT (blue) data (experimental data by Pope and Gawthorpe, 1976).
Longitudinal ventilation: Métro M2 à Lausanne
TNT was used in the design of the ventilation system of the m2 underground line of Lausanne. During the test phase, the performances of the ventilation system were checked and it was possible to compare the results of real scale tests of the equipment with the numerical results obtained during the design phase. Figure 9 shows the evolution of the tunnel air velocity induced by the sequential start of 14 jetfans. The numerical results accurately reproduce this evolution.
