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This article carries out the numerical simulation of airflow over three dimensional car models using ANSYS Fluent software. The calculations have been performed by using realizable k- turbulence model. The external airflow field of the simplified BMW M6 model with or without a wing is simulated. Several aerodynamic characteristics such as pressure distribution, velocity contours, velocity vectors, streamlines, turbulence kinetic energy and turbulence dissipation energy are analyzed in this study. | Vietnam Journal of Science and Technology 56 3 2018 370-379 DOI 10.15625 2525-2518 56 3 10498 NUMERICAL SIMULATION OF AIRFLOW AROUND VEHICLE MODELS Nguyen Van Thang1 Ha Tien Vinh1 Bui Dinh Tri1 2 Nguyen Duy Trong1 1Institute of Mechanics Vietnam Academy of Science and Technology 2Vietnam Academy of Science and Technology Email thangnv2010@gmail.com Received 6 July 2017 Accepted for publication 17 May 2018 Abstract. This article carries out the numerical simulation of airflow over three dimensional car models using ANSYS Fluent software. The calculations have been performed by using realizable k-8 turbulence model. The external airflow field of the simplified BMW M6 model with or without a wing is simulated. Several aerodynamic characteristics such as pressure distribution velocity contours velocity vectors streamlines turbulence kinetic energy and turbulence dissipation energy are analyzed in this study. The aerodynamic forces acting on the car model is calculated and compared with other authors. A rear wing shows a slight increase in the drag coefficient and a remarkable decrease in the lift coefficient. A change of lift force thus improves the car stability. Key words k-8 turbulence model automotive aerodynamics drag lift Classification numbers 5.4.4 5.6.2 5.10.2. 1. INTRODUCTION In recent decades computational fluid dynamics CFD has been playing an important role in engineering and industrial problems. The CFD technology has applied in research design and improvement of aerodynamic car geometry. Therefore automotive industry has a rapid development every year. The Ahmed model was described and performed experimentally by Admed et al. 1 . Two test cases with slant angles of 25 and 35 degrees are estimated. The drag force caused by air flow over the car body at velocities of 40 and 60 m s is examined. Aljure et al. 2 carried out the numerical simulations of flow around two car models the Ahmed and the Asmo cars to investigate turbulent structures. The unsteady .
