Open Access Open Access  Restricted Access Subscription or Fee Access

Numerical Investigation of a Drag Reduction Device Applied to the Ahmed Body


(*) Corresponding author


Authors' affiliations


DOI: https://doi.org/10.15866/iremos.v15i2.22103

Abstract


In this paper, a new technique of drag reduction around a simplified car body called the Ahmed body is introduced. A conduit has been perforated in this body. The purpose of this conduit is bringing part of airflow from the body’s front to be injected in its rear end where the recirculation occurs. In this study, a numerical model of a turbulent flow around a two–dimensional then three–dimensional body has been developed. Numerical simulations have been performed using the computational fluid dynamics software ANSYS Fluent. For the 2D case, series of numerical simulations have been performed. In these simulations, the conduit position relative to the body’s lower slant edge has been modified. For the position with minimum drag, the effect of narrowing the conduit exit has been tested. Finally, the effect of narrowing the conduit exit has been studied. For the 3D case, the effect of changing dimensions of a rectangular conduit and its position from the body’s lower slant edge have been studied. For the position with lower drag, the effect of narrowing the conduit exit has been studied. The 2D and 3D results show that in some conduit configurations, drag could be reduced.
Copyright © 2022 Praise Worthy Prize - All rights reserved.

Keywords


Ahmed Body; Conduit; Drag; Reduction; Turbulent Flow; ANSYS Fluent

Full Text:

PDF


References


J. C. Hilliard and G. S. Springer, (Eds), Fuel Economy (Springer US, Boston, MA, 1984).
https://doi.org/10.1007/978-1-4899-2277-9

S. R. Ahmed, G. Ramm, and G. Faltin, Some Salient Features Of The Time-Averaged Ground Vehicle Wake, SAE Technical Paper 840300, 1984.
https://doi.org/10.4271/840300

A. Agriss, M. Agouzoul, and A. Ettaouil, Reducing drag on a flat plate subjected to incompressible laminar flow MATEC Web of Conferences, (S. Aniss, ed.), Vol. 286:07006, 2019.
https://doi.org/10.1051/matecconf/201928607006

V. Oruç, Strategies for the applications of flow control downstream of a bluff body, Flow Meas. Instrum., Vol. 53:204-214, 2017.
https://doi.org/10.1016/j.flowmeasinst.2016.08.008

P. Gilliéron and A. Kourta, Aerodynamic drag reduction by vertical splitter plates, Exp. Fluids, Vol. 48(Issue1):1-16, 2010.
https://doi.org/10.1007/s00348-009-0705-7

J. -F. Beaudoin and J. -L. Aider, Drag and lift reduction of a 3D bluff body using flaps, Exp. Fluids, Vol. 44(Issue4):491-501, 2008.
https://doi.org/10.1007/s00348-007-0392-1

D. Kim, H. Lee, W. Yi, and H. Choi, A bio-inspired device for drag reduction on a three-dimensional model vehicle, Bioinspir. Biomim., Vol. 11(Issue2):026004, 2016.
https://doi.org/10.1088/1748-3190/11/2/026004

J. Tian, Y. Zhang, H. Zhu, and H. Xiao, Aerodynamic drag reduction and flow control of Ahmed body with flaps, Adv. Mech. Eng. (London, U. K.), Vol. 9(Issue7): 16878140177113, 2017.
https://doi.org/10.1177/1687814017711390

G. Pujals, S. Depardon, and C. Cossu, Drag reduction of a 3D bluff body using coherent streamwise streaks, Exp. Fluids, Vol. 49 (Issue5): 1085-1094, 2010.
https://doi.org/10.1007/s00348-010-0857-5

G. Rossitto, C. Sicot, V. Ferrand, J. Borée, and F. Harambat, Influence of afterbody rounding on the pressure distribution over a fastback vehicle, Exp. Fluids, Vol. 57(Issue3):43, 2016.
https://doi.org/10.1007/s00348-016-2120-1

Khurana, S., Suzuki, K., Rathakrishnan, E., Simultaneous Control of Vortex-Sizes Around Spike Root and Body Base for a Blunt-Nosed Cylindrical Body, (2018) International Review of Aerospace Engineering (IREASE), 11 (5), pp. 176-185.
https://doi.org/10.15866/irease.v11i5.13585

Sharma, D., Poddar, K., Muthukumar, A., Reddy, K., Effect of Boundary Layer Mixing Devices on Hysteresis Behavior of Flow Past a Pitching Airfoil, (2015) International Journal on Engineering Applications (IREA), 3 (1), pp. 14-20.

Laffane, Z., Saidi, F., Hamoudi, B., Boualia, Y., Sedini, A., Passive Blowing on NACA 0012 Profile with Attached Gurney Flap, (2019) International Review of Mechanical Engineering (IREME), 13 (7), pp. 427-437.
https://doi.org/10.15866/ireme.v13i7.17324

M. Rouméas, P. Gilliéron, and A. Kourta, Drag reduction by flow separation control on a car after body, Int. J. Numer. Methods Fluids, Vol. 60 (Issue11): 1222-1240, 2009.
https://doi.org/10.1002/fld.1930

L. Cédric, Réduction de la traînée d'un véhicule automobile simplifié à l'aide du contrôle actif par jet synthétique [Simplified Car Geometry Drag Reduction by Synthetic Jet Actif Flow Control], Ph.D. dissertation, Institut National Polytechnique de Toulouse, Toulouse, France, 2008.

Y. Eulalie, Étude aérodynamique et contrôle de la traînée sur un corps de Ahmed culot droit [Aerodynamic analysis and drag reduction around an Ahmed bluff body], Ph.D. dissertation, Université de Bordeaux, Bordeaux, France, 2014.

B. Wang, Z. Yang, and H. Zhu, Active flow control on the 25°Ahmed body using a new unsteady jet, International Journal of Heat and Fluid Flow, Vol. 79, 108459. 2019.
https://doi.org/10.1016/j.ijheatfluidflow.2019.108459

A. Kourta and C. Leclerc, Characterization of synthetic jet actuation with application to Ahmed body wake, Sensors and Actuators A: Physical, Vol. 192: 13-26, 2013.
https://doi.org/10.1016/j.sna.2012.12.008

A. Brunn, L. Henning, W. Nitsche, and R. King, Application of Slope-Seeking to a Generic Car Model for Active Drag Control, In 26th AIAA Applied Aerodynamics Conference, Honolulu, Hawaii: American Institute of Aeronautics and Astronautics, 2008.
https://doi.org/10.2514/6.2008-6734

Aloui, F., Kourta, A., Ben Nasrallah, S., Turbulent Boundary Layer Synthetic Jet Interaction: Slot Inclination Effects, (2016) International Journal on Engineering Applications (IREA), 4 (2), pp. 45-54.

Conesa Torres, A., Bardera-Mora, R., Sánchez García, M., León Calero, M., 3D Backward-Facing Step Flow Structure Modification with Plasma Actuators, (2017) International Review of Aerospace Engineering (IREASE), 10 (1), pp. 14-23.
https://doi.org/10.15866/irease.v10i1.10491

Marchetto, F., Benini, E., Numerical Simulation of Harmonic Pitching Supercritical Airfoils Equipped with Movable Gurney Flaps, (2019) International Review of Aerospace Engineering (IREASE), 12 (3), pp. 109-122.
https://doi.org/10.15866/irease.v12i3.16723

X. W. Wang, Y. Zhou, Y. F. Pin, and T. L. Chan, Turbulent near wake of an Ahmed vehicle model, Exp. Fluids Vol. 54(Issue4): 1490, 2013.
https://doi.org/10.1007/s00348-013-1490-x

F. R. Menter, Two-equation eddy-viscosity turbulence models for engineering applications. AIAA J., Vol. 32(Issue8): 1598-1605, 1994.
https://doi.org/10.2514/3.12149

E. H. Hirschel (Ed.), Numerical Flow Simulation III. Vol. 82. Notes on Numerical Fluid Mechanics and Multidisciplinary Design (NNFM), Springer Berlin Heidelberg, Berlin, Heidelberg, 2003.
https://doi.org/10.1007/978-3-540-45693-3

ANSYS, Inc., ANSYS Fluent Theory Guide, Release 17.0, Southpointe 2600 ANSYS Drive Canonsburg, PA 15317, January 2016.

G. Fourrié, L. Keirsbulck, L. Labraga and P. Gilliéron, Bluff-body drag reduction using a deflector, Exp. Fluids, Vol. 50(Issue2): 385-395, 2011.
https://doi.org/10.1007/s00348-010-0937-6

E. Guilmineau, Computational study of flow around a simplified car body, Journal of Wind Engineering and Industrial Aerodynamics, Vol. 96 (Issue6-7): 1207-1217, 2008.
https://doi.org/10.1016/j.jweia.2007.06.041

E. Guilmineau, G. B. Deng, A. Leroyer, P. Queutey, M. Visonneau, and J. Wackers, Assessment of hybrid RANS-LES formulations for flow simulation around the Ahmed body, Comput. Fluids, Vol. 176:302-319, 2018.
https://doi.org/10.1016/j.compfluid.2017.01.005

J. Venning, D. Lo Jacono, D. Burton, M. C. Thompson, and J. Sheridan, The nature of the vortical structures in the near wake of the Ahmed body, Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, Vol. 231 (Issue9):1239-1244, 2017.
https://doi.org/10.1177/0954407017690683

H. Lienhart, C. Stoots, and S. Becker, Flow and Turbulence Structures in the Wake of a Simplified Car Model (Ahmed Model). DGLR Fach Symp. der AG STAB, Stuttgart University, 2000.

ERCOFTAC Classic Collection - Cases: case082. Flow around a Simplified Car Body (Ahmed Body).
http://cfd.mace.manchester.ac.uk/ercoftac/doku.php?id=cases%3Acase082


Refbacks

  • There are currently no refbacks.



Please send any question about this web site to info@praiseworthyprize.com
Copyright © 2005-2024 Praise Worthy Prize