Numerical simulation of the transient aerodynamic phenomena induced by passing manoeuvres

TL;DR

This paper presents 3D URANS simulations of passing maneuvers involving Ahmed bodies, analyzing aerodynamic effects at various speeds and distances, with results aligning well with experimental data.

Contribution

It introduces a numerical simulation approach combining deforming and sliding grids to study transient aerodynamics during passing maneuvers.

Findings

Aerodynamic coefficients are significantly affected during passing maneuvers.

Simulation results agree well with experimental data.

The study provides detailed insights into transient aerodynamic phenomena.

Abstract

Several three-dimensional Unsteady Reynolds-Averaged Navier-Stokes (URANS) simulations of the passing generic vehicles (Ahmed bodies) are presented. The relative motion of vehicles was obtained using a combination of deforming and sliding computational grids. The vehicle studied is an Ahmed body with an angle of the rear end slanted surface of $30^{\circ}$. Several different relative velocities and transversal distances between vehicles were studied. The aerodynamic influence of the passage on the overtaken vehicle was studied. The results of the simulations were found to agree well with the existing experimental data. Numerical results were used to explain effects of the overtaking manoeuvre on the main aerodynamic coefficients.