Influence of Rear Slant Angle on Drag and Lift of the Ahmed Body

Sidi Mohamed Ben Abdellah University, Faculty of Sciences and Techniques, Research Laboratory in Science and Engineering, Fez 30000, Morocco

^* Corresponding author: lamiae.benmoussa@usmba.ac.ma
^† Corresponding author: ahmed.elkhalfi@usmba.ac.ma

Abstract

Through computer simulations using numerical methods, an Ahmed body model, was examined to study the aerodynamic properties, as well as the evolution of vortex patterns at the rear of this model. Tests were conducted at three different rear slant angles of 15°, 30° and 45° to evaluate the drag and lift forces. A change in the rear slant angle of the vehicle results in changes in vortex flow because vortex formation and separation adjust to this difference. The best readings for minimum drag and lift were observed on the model surface at 15°, leading to higher readings at both 30° and 45° when vortices formed. The stress points be-tween the two surfaces move as more lift is created by strong changes in airflow near the wings at moderate to high angles of climb. The research objective is to enhance the rear design of the vehicle by finding out how to cut down on air resistance without affecting stability. The stream lines and overall flow shape were examined using ANSYS Fluent, with velocity input at 30 m/s acting as the turning condition.