Analisis aerodinamis bodi mobil listrik Geni Biru KMHE 2020 terhadap kecepatan menggunakan simulasi CFD

Abstract

Many aspects and parameters are taken to overcome energy consumption savings in prototype electric cars in addition to modifying the engine system, including the aerodynamic / streamlined body shape of the car to reduce drag generated. The purpose of this study is to determine the value of the drag coefficient (CD) and lift coefficient (CL) and to visualize the contour and streamlined velocity of air fluid that crosses the body of the Geni Biru KMHE 2020 electric car using the CFD (Computational Fluid Dynamics) method with three stages: pre-processing which includes the formation of body geometry and wind tunnel enclosure with 7 m / s inlet velocity input parameters, solving with 1000 iteration convergence target iterations, and post-processing by displaying a residual convergence history graph. From numerical analysis using the CFD method, the air fluid that crosses the body of the Geni Biru KMHE 2020 electric car at a speed of 7 m / s is a drag coefficient (CD) value of 0.144 and a drag force value of 1.884 N, while the lift coefficient (CL) value is 0.014. and the lift force value is 0.183 N. The results of the contour pressure analysis show that there is a stagnation area at the front of the body (nose) marked in red and bubble separation occurs at several points marked in green. And from the streamlined plot analysis, there are several separation points at the rear which cause the creation of a wake area which affects the amount of drag force (drag) which has an impact on the decreasing speed of the car.