Numerical Investigation of Vehicle Overtaking using CFD

The importance of overtaking investigation is to ensure that vehicle can remain stable under turbulent conditions. The flow distribution occurring on a light vehicle (bike) when it is passing by a heavy vehicle (bus) investigated using three dimensional (3D) Computational Fluid Dynamics. Previous tests have been researched and compared, it was found that the overtaking vehicle causes the other vehicle it experience sideward forces, leading to roll followed by undergoing a yawing moments as well as reductions in speed, caused by changing pressure distributions throughout the vehicles. An aerodynamic characteristic of a vehicle is of significant interest in reducing accidents due to wind loading and in reducing the fuel consumption. To avoid accidents we should reduce the wake region of the entire body of each vehicle. For that modulation in shape the boundary layer condition are changed and the flow separation are also reduced to small. This report presents a control and stability of a vehicle (Bus and Bike) overtaking and air flow pattern around the vehicle body using Computational Fluid Dynamics (CFD) software. The bike is modeled without aerokit and CFD analysis is carried out to study the static pressure, velocity and wake region. The CAD model is created by using Creo parametric software and CFD analysis is done by using ANSYS software.