Simulation of Fluid Flow Through Sedan Car YRS 4 Doors with Speed Variation using CFD


  • Syamsuri Ilmi Institut Teknologi Adhi Tama Surabaya
  • Zain Lillahulhaq Institut Teknologi Adhi Tama Surabaya
  • M Yusron Institut Teknologi Adhi Tama Surabaya



Sedan Car, Drag Coefficient, Quad Pave Mesh Model, CFD


Aerodynamic forces that occur around the vehicle must be considered since it involves safety, ergonomic, and fuel consumption. To reduce fuel consumption, the vehicle should be built as aerodynamic as possible to minimize drag forces. The vehicle becomes unstable at high speed due to increasing lift force. To balance the vehicle at high speed, a downforce should be generated to keep the tires attached to the road surface. Each type of car has a various value of aerodynamic force due to its design, dimension, and cross-section area. The characteristics of streamflow around the car are discussed in this paper. This research simulated 2D sedan car YRS 4 Doors in the steady condition in various velocities, i.e. 23 m/s, 26 m/s, and 40 m/s. This simulation used the Quad Pave mesh model and run in k-ε implicit turbulence model. The characteristics could be observed from the qualitative and quantitative data. The quantitative data used as measurable data were Coefficient of Pressure (CP) and Drag Coefficient (CD).  Quantitative data was shown to outline a better visual explanation of the streaming characteristic. The qualitative data used in this paper are path lines, velocity vectors, and contours. The high-velocity stream results in a low value of CP. When the fluid flowed at high speed through a surface, it had low pressure. The coefficient of drag in the high-speed car decreased as the free stream increased. The value of the coefficient of drag (Cd) from this research was app. 0.567.


MOHAMMED-KASSIM, Z. & FILLIPONE, A., “Fuel savings on a heavy vehicle via aerodynamic drag reductionâ€, Transportation Research Part D: Transport and Environment, v. 5 n. 15, pp. 275–284, 2010

NORWAZAN, A. R., KHALID, A. J., ZULKIFFLI, A. K., NADIA, O., Fuad, M. N., “Experimental and numerical analysis of lift and drag force of sedan car spoilerâ€, Applied Mechanics and Materials, v. 165, pp. 43–47, 2012

KUREC, K., REMER, M., “The influence of different aerodynamic setups on enhancing a sports car’s braking†International Journal of Mechanical Science, v. 164, pp. 105-140, 2019

HU, X. & Wong, E. T. T., “A Numerical Study On Rear-spoiler Of Passenger Vehicleâ€, World Academy of Science, Engineering and Technology, v. 57, pp. 636–641, 2011

SHARMA, R. B. & BANSAL, R. “Aerodynamic Drag Reduction of a Passenger Car Using Spoiler with VGsâ€, International Journal of Engineering Research and Applications (IJERA), pp. 256-263, 2014

KUMAR, V. N., NARAYAN, K. L., RAO, L. N., SRI RAM, Y, “Investigation of Drag and Lift Forces over the Profile of Car with Rearspoiler Using CFDâ€, International Journal of Science and Research v. 1 n. 8, pp. 331-339, 2013

BEZAVADA, S. & KODALI, S. P., “Numerical simulation of air flow over a passenger car and the In-fluence of rear spoiler using CFD†International Journal of Advanced Transport Phenomena, v. 1 n. , pp. , 2012

KUYA, Y., TAKEDA, K., Zhang, X., “Computational investigation of a race car wing with vortex gen-erators in ground effectâ€, Journal of Fluids Engineering, Transactions of the ASME v. 132 n. 2, pp. 0211021–0211028, 2010

ISLAM, M. R., Hossain, M. A., Mashud, M., Gias, M. T. I., “Drag Reduction of a Car by Using Vortex Generatorâ€, International Journal of Scientific & Engineering Research, v. 4 n. 7, pp. 1298 - 1302, 2013.

SELVARAJU, P., PARAMMASIVAM, M., SHANKAR, D., “Analysis of drag and lift performance in sedan car model using CFD, Journal of Chemical and Pharmaceutical Sciences, special issue 7, pp. 429-435, 2015.

SYAMSURI, S., SUHENI, S., MAULANA, H. S., “Simulasi numerik kombinasi perpindahan panas konveksi alami dan radiasi pada square cavityâ€, Turbo : Jurnal Program Studi Teknik Mesin v. 8 n. 2., pp. 208-213, 2019

GUILMINEAU, E., “Computational study of flow around a simplified car bodyâ€, Journal of Wind Engineering and Industrial Aerodynamics, v. 96 n. 6–7, pp. 1207–1217, 2008

LILLAHULHAQ, Z. & MAULANA, H. S., “Pengaruh Model Turbulensi Aliran Terhadap Simulasi Numerik Aircurtain†MEKANIKA: Jurnal Teknik Mesin, v. 5 n. 2, 40–45, 2020

MENTER, F. R. & KUNTZ, M., “Adaptation of Eddy-Viscosity Turbulence Models to Unsteady Separated Flow Behind Vehiclesâ€, The Aerodynamics of Heavy Vehicles: Trucks, Buses, and Trains, Berlin, Springer Verlag, pp 339-352, 2004