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Correlation between drag variation and rear surface pressure of an Ahmed body

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Abstract

The correlation between drag variation and rear surface pressure of an Ahmed body with a slant angle of 25° is experimentally studied. The body is forced with several independent steady blowings deployed around the rear window and the vertical base. Several combinations of the independent blowings are investigated, which produce a drag reduction of 16–26%. It is found that the drag or total pressure variation associated with each combination of blowings could always be reasonably well represented by two local pressures, one on the rear window and the other on the base, and the correlation between this drag and a linear combination of the variations in the two local pressures is approximately linear. Extensive flow measurements are conducted to understand the flow physics behind the finding, which provides a valuable guidance on the choice of the feedback pressure signals for future closed-loop drag reduction control studies.

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References

  • Ahmed SR, Ramm G, Faltin G (1984) Some salient features of the time-averaged ground vehicle wake. SAE Technical paper 840300, 1–30, Society of Automotive Engineers, Inc., Warrendale, PA

  • Aubrun S, McNally J, Alvi F, Kourta A (2011) Separation flow control on a generic ground vehicle using steady microjet arrays. Exp Fluids 51:1177–1187

    Google Scholar 

  • Beaudoin JF, Aider JL (2008) Drag and lift reduction of a 3D bluff body using flaps. Exp Fluids 44:491–501

    Google Scholar 

  • Bellman M, Agarwal R, Naber J, Chusak L (2010) Reducing energy consumption of ground vehicles by active flow control. In: Proceedings of ASME 4th International Conference on Energy Sustainability Vol 1:785–793

  • Boucinha V, Weber R, Kourta A (2011) Drag reduction of a 3D bluff body using plasma actuators. Int J Aerod 1:262–281

    Google Scholar 

  • Bruneau C-H, Creusé E, Depeyras D, Gilliéron P, Mortazavi I (2011) Active procedures to control the flow past the Ahmed body with a 25° rear window. Int J Aerod 1:299–317

    MATH  Google Scholar 

  • Brunn A, Wassen E, Sperber D, Nitsche W, Thiele F (2007) Active drag control for a generic car model. Active Flow Control. Springer, Berlin, Heidelberg, pp 247–259

    MATH  Google Scholar 

  • Brunn A, Henning L, Nitsche W, King R (2008) Application of slope-seeking to a generic car model for active drag control. In: 26th AIAA Applied Aerodynamics Conference, AIAA Paper 2008–6734.

  • Bushnell DM, Mcginley CB (1989) Turbulence control in wall flows. Annu Rev Fluid Mech 21:1–20

    MATH  Google Scholar 

  • Choi H, Jeon WP, Kim J (2008) Control of flow over a bluff body. Annu Rev Fluid Mech 40:113–139

    MathSciNet  MATH  Google Scholar 

  • Choi H, Lee J, Park H (2014) Aerodynamics of heavy vehicles. Annu Rev Fluid Mech 46:441–468

    MathSciNet  MATH  Google Scholar 

  • Chong MS, Perry AE, Cantwell BJ (1990) A general classification of three-dimensional flow fields. Phys Fluids A: Fluid Dynamics 2:765–777

    MathSciNet  Google Scholar 

  • Draper NR, Smith H (1998) Applied regression analysis. John Wiley & Sons

    MATH  Google Scholar 

  • Fourrie G, Keirsbulck L, Labraga L, Gillieron P (2011) Bluff-body drag reduction using a deflector. Exp Fluids 50:385–395

    Google Scholar 

  • Gad-el-Hak M (2000) Flow control : passive, active, and reactive flow management. Cambridge University Press

    MATH  Google Scholar 

  • Gomes-Fernandes R, Ganapathisubramani B, Vassilicos JC (2012) Particle image velocimetry study of fractal-generated turbulence. J Fluid Mech 711:306–336

    MATH  Google Scholar 

  • Grandemange M, Gohlke M, Cadot O (2013) Turbulent wake past a three-dimensional blunt body. Part 1. Global modes and bi-stability. J Fluid Mech 722:51–84

    MATH  Google Scholar 

  • Henning L, Becker R, Feuerbach G, Muminovic R, King R, Brunn A, Nitsche W (2008) Extensions of adaptive slope-seeking for active flow control. P I Mech Eng I-J Sys 222:309–322

    Google Scholar 

  • Howard RJA, Pourquie M (2002) Large eddy simulation of an Ahmed reference model. J Turbul. https://doi.org/10.1146/annurev.fl.25.010193.002413

    Article  Google Scholar 

  • Hucho WH, Sovran G (1993) Aerodynamics of Road Vehicles. Annu Rev Fluid Mech 25:485–537

    Google Scholar 

  • Joseph P, Amandolese X, Aider JL (2012) Drag reduction on the 25 degrees slant angle Ahmed reference body using pulsed jets. Exp Fluids 52:1169–1185

    Google Scholar 

  • Joseph P, Amandolese X, Edouard C, Aider JL (2013) Flow control using MEMS pulsed micro-jets on the Ahmed body. Exp Fluids 54(1):1442

    Google Scholar 

  • Kim D, Lee H, Yi W, Choi H (2016) A bio-inspired device for drag reduction on a three-dimensional model vehicle. Bioinspir Biomim 11(2):026004

    Google Scholar 

  • Kim D, Do H, Choi H (2020) Drag reduction on a three-dimensional model vehicle using a wire-to-plate DBD plasma actuator. Exp Fluids. https://doi.org/10.1007/s00348-020-02961-3

    Article  Google Scholar 

  • King R, Aleksic K, Gelbert G, Losse N, Muminovic R, Brunn A, Nitsche W, Bothien M, Moeck J, Paschereit C, Noack B, Rist U, Zengl M (2008) Model predictive flow control - Invited Paper. In: 38th Fluid Dynamics Conference and Exhibit, AIAA Paper 2008–3975

  • Kourta A, Leclerc C (2013) Characterization of synthetic jet actuation with application to Ahmed body wake. Sens Actuator A-Phys 192:13–26

    Google Scholar 

  • Krajnović S (2014) Large eddy simulation exploration of passive flow control around an Ahmed body. J Fluids Eng. https://doi.org/10.1115/1.4027221

    Article  Google Scholar 

  • Krajnović S, Basara B (2010) LES of the flow around Ahmed body with active flow control. In: Deville M, Lê T-H, Sagaut P (eds) Turbulence and interactions: proceedings the TI 2009 Conference. Springer, Berlin Heidelberg, Berlin, Heidelberg, pp 247–254

    Google Scholar 

  • Krentel D, Muminovic R, Brunn A, Nitsche W, King R (2010) Application of active flow control on generic 3D car models. Active Flow Control II. Springer, Berlin Heidelberg, pp 223–239

    Google Scholar 

  • Lehugeur B, Gillieron P (2006) Active control of vortex breakdown phenomenon in the wake of a simplified car geometry. Proc Asme Fluids Eng Div Summer Conf 2:709–714

    Google Scholar 

  • Lehugeur B, Gilliéron P, Bobillier P (2008) Contrôle des structures tourbillonnaires longitudinales dans le sillage d’une géométrie simplifiée de véhicule automobile: approche expérimentale. Méc Ind 9:533–541

    Google Scholar 

  • Littlewood RP, Passmore MA (2012) Aerodynamic drag reduction of a simplified squareback vehicle using steady blowing. Exp Fluids 53:519–529

    Google Scholar 

  • Liu X, Gui N, Wu H, Yang X, Tu J, Jiang S (2020) Numerical simulation of flow past stationary and oscillating deformable circles with fluid-structure interaction. Exp Comput Multiph Flow 2:151–161

    Google Scholar 

  • Liu K, Zhang BF, Zhang YC, Zhou Y (2021) Flow structure around a low-drag Ahmed body. J Fluid Mech 913:A21

    Google Scholar 

  • McNally J, Mazellier N, Alvi F, Kourta A (2019) Control of salient flow features in the wake of a 25° Ahmed model using microjets. Exp Fluids 60(1):7

    Google Scholar 

  • Mestiri R, Ahmed-Bensoltane A, Keirsbulck L, Aloui F, Labraga L (2014) Active flow control at the rear end of a generic car model using steady blowing. J Appl Fluid Mech 7:565–571

    Google Scholar 

  • Metka M, Gregory JW (2015) Drag reduction on the 25-deg Ahmed model using fluidic oscillators. J Fluids Eng. https://doi.org/10.1115/1.4029535

    Article  Google Scholar 

  • Muminovic R, Henning L, King R, Brunn A, Nitsche W (2008) Robust and model predictive drag control for a generic car model. In: 4th Flow Control Conference. AIAA Paper 2008–3859

  • Nabavi M, Siddiqui MHK, Dargahi J (2008) Experimental investigation of the formation of acoustic streaming in a rectangular enclosure using a synchronized PIV technique. Meas Sci Technol 19(6):065405

    Google Scholar 

  • Park H, Cho J-H, Lee J, Lee D-H, Kim K-H (2013a) Aerodynamic drag reduction of Ahmed model using synthetic jet array. SAE Int J Passeng Cars Mech Syst 6:1–6

    Google Scholar 

  • Park H, Cho J-H, Lee J, Lee D-H, Kim KH (2013b) Experimental study on synthetic jet array for aerodynamic drag reduction of a simplified car. J Mech Sci Technol 27:3721–3731

    Google Scholar 

  • Pujals G, Depardon S, Cossu C (2010) Drag reduction of a 3D bluff body using coherent streamwise streaks. Exp Fluids 49:1085–1094

    Google Scholar 

  • Rawlings JO, Pantula SG, Dickey DA (1998) Applied regression analysis: a research tool, 2nd edn. Springer, New York

  • Rossitto G, Sicot C, Ferrand V, Borée J, Harambat F (2016) Influence of afterbody rounding on the pressure distribution over a fastback vehicle. Exp Fluids 57(3):43

    Google Scholar 

  • Roumeas M, Gillieron P, Kourta A (2009) Drag reduction by flow separation control on a car after body. Int J Numer Methods Fluids 60:1222–1240

    MATH  Google Scholar 

  • Sciacchitano A, Wieneke B, Scarano F (2013) PIV uncertainty quantification by image matching. Meas Sci Technol 24(4):045302

    Google Scholar 

  • Sellappan P, McNally J, Alvi FS (2018) Flow topology of a ground vehicle wake and its response to flow control. In: 2018 AIAA Aerospace Sciences Meeting. AIAA Paper 2018–0557

  • Thacker A, Aubrun S, Leroy A, Devinant P (2012) Effects of suppressing the 3D separation on the rear slant on the flow structures around an Ahmed body. J Wind Eng Ind Aerodyn 107:237–243

    Google Scholar 

  • Tian J, Zhang YC, Zhu H, Xiao HW (2017) Aerodynamic drag reduction and flow control of Ahmed body with flaps. Adv Mech Eng 9(7):1687814017711390

    Google Scholar 

  • Tounsi N, Mestiri R, Keirsbulck L, Oualli H, Hanchi S, Aloui F (2016) Experimental study of flow control on bluff body using piezoelectric actuators. J Appl Fluid Mech 9:827–838

    Google Scholar 

  • Venning J, Lo Jacono D, Burton D, Thompson MC, Sheridan J (2017) The nature of the vortical structures in the near wake of the Ahmed body. Proc Inst Mech Eng Part D-J Automob Eng 231:1239–1244

    Google Scholar 

  • Vino G, Watkins S, Mousley P, Watmuff J, Prasad S (2005) Flow structures in the near-wake of the Ahmed model. J Fluids Struct 20:673–695

    Google Scholar 

  • Wang HF, Yu Z, Chao Z, He XH (2016) Aerodynamic drag reduction of an Ahmed body based on deflectors. J Wind Eng Ind Aerodyn 148:34–44

    Google Scholar 

  • Wang BX, Yang ZG, Zhu H (2019) Drag reduction on the 25 degrees Ahmed body using a new zero-net-mass-flux flow control method. Theor Comp Fluid Dyn 33:411–431

    Google Scholar 

  • Wassen E, Thiele F (2008) Drag reduction for a generic car model using steady blowing. In: 4th Flow Control Conference. Fluid Dynamics and Co-located Conferences. AIAA Paper 2008–3771

  • Wassen E, Thiele F (2009) Road vehicle drag reduction by combined steady blowing and suction. In: 39th AIAA Fluid Dynamics Conference. Fluid Dynamics and Co-located Conferences. AIAA Paper 2009–4174

  • Wassen E, Thiele F (2010) Simulation of active separation control on a generic vehicle. In: 5th Flow Control Conference. Fluid Dynamics and Co-located Conferences. AIAA Paper 2010–4702

  • Zhang BF, Zhou Y, To S (2015) Unsteady flow structures around a high-drag Ahmed body. J Fluid Mech 777:291–326

    Google Scholar 

  • Zhang BF, Liu K, Zhou Y, To S, Tu JY (2018) Active drag reduction of a high-drag Ahmed body based on steady blowing. J Fluid Mech 856:351–396

    Google Scholar 

  • Zhou J, Adrian RJ, Balachandar S, Kendall TM (1999) Mechanisms for generating coherent packets of hairpin vortices in channel flow. J Fluid Mech 387:353–396

    MathSciNet  MATH  Google Scholar 

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Funding

This study was funded by National Natural Science Foundation of China under grants 11632006, 91952204 and 11902102, and by Research Grant Council of Shenzhen Government under grants JCYJ20190806143611025 and CB11409006.

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Authors and Affiliations

  1. Center for Turbulence Control, Harbin Institute of Technology, Shenzhen, 518055, China

    Kai Liu, Bingfu Zhang & Yu Zhou

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  1. Kai Liu
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  2. Bingfu Zhang
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  3. Yu Zhou
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Correspondence to Bingfu Zhang or Yu Zhou.

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Liu, K., Zhang, B. & Zhou, Y. Correlation between drag variation and rear surface pressure of an Ahmed body. Exp Fluids 62, 124 (2021). https://doi.org/10.1007/s00348-021-03214-7

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