Bus Body Outflow Field Of Numerical Simulation

The CFD method is applied to study the 3-D flow around a bus in this paper. According to the character of outer shape of modem buses, the numerical calculationsare performed from the simplest shape-cuboid by using ANSYS/FLOTRAN software. First, the foreside of the cuboid is modified step by step in 17 models (this is equal to the process of modification to the foreside of a bus). Second, the afterbody of the cuboid is modified step by step in 9 models to model flow wake at rear end and get the drag coefficients and lift coefficients in different aterbodies. Last, the flow-Field numerical simulations and analysis of two modem buses are performed. In the paper, the computational results of all models are obtained, including 3-D velocity field, 3-D pressure field, and six aerodynamic coefficients. The results have good agreement with wind tunnel test.