Computational Analysis of Actuation Techniques Impact on the Flow Control around the Ahmed Body

被引:2
|
作者
Edwige, Stephie [1 ,2 ]
Gilotte, Philippe [2 ]
Mortazavi, Iraj [1 ]
机构
[1] Conservatoire Natl Arts & Metiers, Lab M2N, F-75003 Paris, France
[2] Intelligent Exterior Syst, Plast Omnium, F-59010 St Julie, France
关键词
Ahmed body; large eddy simulation; active control; pulsed jets; synthetic jets; suction jets; drag reduction; WAKE;
D O I
10.3390/fluids7020052
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
Active flow control with jet devices is a promising approach for vehicle aerodynamics control. In this work an extended computational study is performed comparing three different actuation strategies for active flow control around the square back Ahmed body at Reynolds number 500,000 (based on the vehicle height). Numerical simulations are run using a Large Eddy Simulation (LES) approach, well adapted to calculate the unsteady high Reynolds number flow control using periodic jet devices. computations are validated comparing to in-house experiments for uncontrolled and some controlled cases. The novelty of this investigation is mainly related to the in-depth study of the base flow and actuation approaches by an accurate LES method and their comparison to experiments. Here, several simulations are performed to estimate the effect of active controls on the flow topology and the drag reduction. Beside the continuous blowing jet, three periodic actuation techniques including periodic blowing and suction as well as the zero flux synthetic jet devices are explored. The slots are implemented discontinuously in order to achieve a better control efficiency linked to vortex generation. In this framework, spectral analyses on global aerodynamical quantities, rear pressure/drag coefficient behavior examination as well as wake structure investigations are performed in order to compare these jet actuations. As a result, shear layer variations are observed during the blowing phase, but the main flow topology change occurs with suction and synthetic jets. Rear back pressure is therefore substantially increased.
引用
收藏
页数:21
相关论文
共 50 条
  • [1] LES of the Flow around Ahmed Body with Active Flow Control
    Krajnovic, Sinisa
    Basara, Branislav
    [J]. TURBULENCE AND INTERACTIONS, 2010, 110 : 247 - +
  • [2] LES INVESTIGATION OF PASSIVE FLOW CONTROL AROUND AN AHMED BODY
    Krajnovic, Sinisa
    [J]. PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2013, VOL 7A, 2014,
  • [3] Numerical Simulation of Unsteady Flow around Ahmed Body with Active Flow Control
    Wang Bingxin
    Zhu Hui
    Yang Zhigang
    [J]. APPLIED MECHANICS AND MATERIALS I, PTS 1-3, 2013, 275-277 : 402 - 408
  • [4] CFD STUDY OF FLOW AROUND AHMED BODY
    Lienhart, Raphael
    Jesudhas, Vimaldoss
    Balachandar, Ram
    Barron, Ron
    Rodriguez, Romain
    Murzyn, Frederic
    [J]. 4TH THERMAL AND FLUIDS ENGINEERING CONFERENCE, ASTFE 2019, 2019,
  • [5] Large Eddy Simulation Exploration of Passive Flow Control Around an Ahmed Body
    Krajnovic, Sinisa
    [J]. JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME, 2014, 136 (12):
  • [6] Numerical Simulation and Control of the 3D Flow Around Ahmed Body
    Bruneau, C. -H.
    Creuse, E.
    Depeyras, D.
    Gillieron, P.
    Mortazavi, I.
    [J]. COMPUTATIONAL FLUID DYNAMICS 2010, 2011, : 297 - +
  • [7] Sensitivity analysis of hybrid methods for the flow around the ahmed body with application to passive control with rounded edges
    Delassaux, Francois
    Mortazavi, Iraj
    Itam, Emmanuelle
    Herbert, Vincent
    Ribes, Charles
    [J]. COMPUTERS & FLUIDS, 2021, 214
  • [8] Experimental and numerical studies of the flow around the Ahmed body
    Tunay, Tural
    Sahin, Besir
    Akilli, Huseyin
    [J]. WIND AND STRUCTURES, 2013, 17 (05) : 515 - 535
  • [9] ANALYSIS AND ACTIVE CONTROL OF THE FLOW AROUND TWO FOLLOWING AHMED BODIES
    Bruneau, Charles-Henri
    Khadra, Khodor
    Mortazavi, Raj
    [J]. PROCEEDINGS OF THE ASME FLUIDS ENGINEERING DIVISION SUMMER MEETING, 2013, VOL 1B: SYMPOSIA, 2014,
  • [10] Computational Analysis of Flow Field around Ahmed Car Model Passing Underneath a Flyover
    Musa, Md Nor
    Osman, Kahar
    Hamat, Ab Malik A.
    [J]. 4TH INTERNATIONAL MEETING OF ADVANCES IN THERMOFLUIDS (IMAT 2011), PT 1 AND 2, 2012, 1440 : 190 - 198