Numerical Calculation of Aerodynamic Drag of Train in Tu nnel
Xu Weilin, Liao Huasheng, Wang Wei
(Sichuan Union University, Chengdu, 610065)

Abstract: The aerodynamic drag of train in tunnel is calculated on the basis of the mathem atical model of turbulence. The axi-symmetric k-¦Å model and PISO method are e mployed. The roughnes of wall is taken into condsideration on the basis of the N icurades formula and profile of velocity on a rough wall. The irregular boundary is treated by correcting the velocity near the wall. The calculation is achived under the different conditions. The relations between the aerodynamic drag and the different factors are analysed and compared with that obtained by the classical method.
Keywords: aerodynamic drag, numerical calculation, train, tunnel.