Natural ventilation is the process of replacing the air in a tunnel with fresh air outside the tunnel, without using ventilating machines, which consume fossil fuel. Temperature and pressure of the air are the main factors which affect the natural ventilation performance of a tunnel. In this study, computational fluid dynamic (CFD) modeling were conducted to investigate ventilation performance of wind tower with different temperature difference to find how the temperature difference affects hydrodynamic behavior of shallow tunnel.The simulation used the CFD software Fluent 16.0, the numerical model selected the component transport model and the turbulence model (k-epsilon), the solver selected the SIMPLE algorithm in the separate solver, and the discrete method selected the second-order welcome style. The variation of velocity, temperature and pressure in different sections of the tunnel under different internal and external temperature differences of the tunnel were analyzed. The results show that the influence of the temperature difference value on the natural wind of the tunnel is different in different temperature sections. The influence of the temperature difference of the low temperature section on the natural wind speed is greater than that of the high temperature section.This study provides a theoretical basis for the rational use of natural winds in shallow tunnels with exhaust towers.Wind tower as a natural ventilation system is commonly used in tunnel to minimize the consumption of non-renewable energy and reduce the harmful emissions.

CICTP