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Research Papers: Flows in Complex Systems

Passive Control Around the Two-Dimensional Square Back Ahmed Body Using Porous Devices

[+] Author and Article Information
Charles-Henri Bruneau

Institut de Mathématiques de Bordeaux, Université Bordeaux 1, INRIA Bordeaux-Sud Ouest Team MC2, CNRS UMR 5466, 351 Cours de la Libération, F-33405 Talence, Francebruneau@math.u-bordeaux1.fr

Iraj Mortazavi

Institut de Mathématiques de Bordeaux, Université Bordeaux 1, INRIA Bordeaux-Sud Ouest Team MC2, CNRS UMR 5466, 351 Cours de la Libération, F-33405 Talence, Francemortaz@math.u-bordeaux1.fr

Patrick Gilliéron

 Technocentre Renault, Département Systémes Véhicles, 1 Avenue du Golf, F-78288 Guyancourt, Francepatrick.gillieron@renault.com

J. Fluids Eng 130(6), 061101 (May 19, 2008) (12 pages) doi:10.1115/1.2917423 History: Received November 03, 2006; Revised March 19, 2008; Published May 19, 2008

The control of two-dimensional flows around the square back Ahmed body is achieved by using porous devices added on some parts of the body. The square back Ahmed body is considered either in an open domain or on top of a road. The modeling of the flow in different media is performed by means of the penalization method. A good choice of the location of the porous interfaces yields a significant improvement of the aerodynamic quantities, especially for the square back body.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Computational domain including the square back Ahmed body

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Figure 2

Cases 1 (top left), 2 (top right), 3 (middle left), 4 (middle right), 5 (bottom left), and 6 (bottom right) corresponding to various porous device geometries

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Figure 3

Vorticity field around the square back Ahmed body in an open domain at Re=30,000; Cases 0 (left) and 5 (right)

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Figure 4

Time-mean vorticity isolines of the flow near the top front section of a square back Ahmed body at Re=30,000. Cases 0 (top left), 1 or 3 (top right), 2 or 4 (bottom left), and 5 (bottom right). Dotted lines refer to negative values while solid lines refer to positive ones where the absolute values of the isolines are 1, 2, 3, 4, 6, 8, 10, 12, 15, 20, and 30.

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Figure 5

Time-mean velocity vectors of the flow near the top front section of a square back Ahmed body at Re=30,000. Cases 0 (top left), 1 or 3 (top right), 2 or 4 (bottom left), and 5 (bottom right).

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Figure 6

Time-mean vorticity isolines for the flow around the square back Ahmed body in an open domain at Re=30,000. Cases 0 (top left), 1 (top right), 2 (middle-up left), 3 (middle-up right), 4 (middle-down left), 5 (middle-down right), 6 (bottom left), and 7 (bottom right). Dotted lines refer to negative values while solid lines refer to positive ones where the absolute values of the isolines are 1, 2, 3, 4, 6, 8, 10, 12, 15, 20, and 30.

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Figure 7

Time-mean static pressure coefficient Cp isolines for the flow around the square back Ahmed body in an open domain at Re=30,000. Cases 0 (top left), 1 (top right), 2 (middle-up left), 3 (middle-up right), 4 (middle-down left), 5 (middle-down right), 6 (bottom left), and 7 (bottom right). Dotted lines refer to positive values while solid lines refer to negative ones where the change in the quantity between each subsequent isoline is equal to 0.2. The thick solid line refers to the isovalue 0.0.

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Figure 13

Time history of the drag coefficient (left) and the enstrophy (right) for the flow around the square back Ahmed body on top of a road at Re=30,000

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Figure 12

Time-mean static pressure coefficient Cp isolines for the flow around the square back Ahmed body on top of a road at Re=30,000. Cases 0 (top left), 1 (top right), 2 (middle left), 3 (middle right), 4 (bottom left), and 5 (bottom right). Dotted lines refer to positive values while solid lines refer to negative ones where the change in the quantity between each subsequent isoline is equal to 0.2. The thick solid line refers to the isovalue 0.0.

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Figure 11

Time-mean vorticity isolines for the flow around the square back Ahmed body on top of a road at Re=30,000. Cases 0 (top left), 1 (top right), 2 (middle left), 3 (middle right), 4 (bottom left), and 5 (bottom right). Dotted lines refer to negative values while solid lines refer to positive ones where the absolute values of the isolines are 1, 2, 3, 4, 6, 8, 10, 12, 15, 20, and 30.

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Figure 10

Vorticity field around the square back Ahmed body on top of a road at Re=30,000; Cases 0 (top left), 1 (top right), 2 (bottom left), and 4 (bottom right)

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Figure 9

Time history of the drag coefficient (left) and the enstrophy (right) for the flow around the square back Ahmed body in an open domain at Re=30,000

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Figure 8

Time-mean static pressure coefficient Cp isolines for the flow around the square back Ahmed body in an open domain at Re=30,000. Case without control (left) and case with control by a permanent jet on top of the back (right). Dotted lines refer to positive values while solid lines refer to negative ones where the change in the quantity between each subsequent isoline is equal to 0.2. The thick solid line refers to the isovalue 0.0.

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