In this study external airflows around road vehicle models were numerically studied to investigate the aerodynamic characteristics. Models used in this study were simplified from the car which is runnung, and after understanding the physical meaning t...
In this study external airflows around road vehicle models were numerically studied to investigate the aerodynamic characteristics. Models used in this study were simplified from the car which is runnung, and after understanding the physical meaning through numerical simulations for 2-D models, this was verified through numerical simulations for semi 3-D models amd 3-D model. FVM based on a general curvilinear coordinate system was used to solve the governing equations and for turbulent flows, standard k-εmodel were used. Two different differencing schemes e.g. Upwind Differencing Scheme and Linear Upwind Differencing Scheme were used and compared. There was large wake region behind vehicles, so the differencing scheme had an influence on the calculation results. The drag coefficients of 3-dimensional model car by the calculation were about 40-50% higher than the experimental values.