Drive Through Water Simulation A Comparative Study on the Effect of Drag Force on the Ahmed Body with A Commercial Car

Abstract

Computational Fluid Dynamics can provide valuable insight into the flow field around a car (water and air).Particularly when the chassis experiences the drag due to water. When any vehicle moves in the flooded roads, it experiences the drag produced by the water because of this drag, the velocity keeps on decreasing. After heavy rain events, streets may be flooded, and the maximum wading depth of the car can be reached quickly. Furthermore, even at low velocities, a bow wave can develop, which increases the risk of water getting into the combustion system.The work focuses on a study on the variation of velocity and the effect of drag force with the displacement of the Ahmed body in water and the splashing of water over the chassis. To compare the results the geometry of a four-wheeler (i.e. car) is also considered. This complete simulation is based on multiphase in which two phases were selected as air and water.it is performed in Ansys fluent taking K-omega SST model which is generally used for two-equation eddy viscosity models which helped in the simulation for calculating drag force as well as the drag coefficient.