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Control of the antisymmetric mode (m = 1) for high Reynolds axisymmetric turbulent separating/reattaching flows
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10.1063/1.3614481
/content/aip/journal/pof2/23/9/10.1063/1.3614481
http://aip.metastore.ingenta.com/content/aip/journal/pof2/23/9/10.1063/1.3614481

Figures

Image of FIG. 1.
FIG. 1.

Sketch of the mean axisymmetric afterbody flow. D denotes the diameter of the main body.

Image of FIG. 2.
FIG. 2.

Cutaway through the mesh around the uncontrolled afterbody called (REF).

Image of FIG. 3.
FIG. 3.

(Color online) Controlled configurations with continuous fluidic injectors.

Image of FIG. 4.
FIG. 4.

(Color online) Iso-surface of colored by the streamwise velocity showing the coherent structures downstream of the step flows. Rectangle: spatial location for the control devices. Ellipse: spatial location of the area of potential receptivity.

Image of FIG. 5.
FIG. 5.

(Color online) Iso-surface of colored by the streamwise vorticity (white for positive values and dark for negative values). Orange iso-surface indicates the way continuous jets penetrate the flow.

Image of FIG. 6.
FIG. 6.

(Color online) Snapshots of Q-criterion at several instances showing the helical convection of a structure (circled).

Image of FIG. 7.
FIG. 7.

(Color online) Perspective views of in selected transverse and longitudinal planes of the controlled and uncontrolled configurations.

Image of FIG. 8.
FIG. 8.

(Color online) Streamlines with contours of streamwise velocity for the reference and controlled configurations in a plane at an angle .

Image of FIG. 9.
FIG. 9.

(Color online) Influence of the control devices (orange markers materialize penetration length of the jets) with two iso-surfaces of, respectively, streamwise velocity () and ().

Image of FIG. 10.
FIG. 10.

(Color online) Streamwise evolution of the mean pressure coefficient. : Deprés et al. (Ref. 7) (kulites), Δ: Deprés et al. (Ref. 7) (steady tabs), •: Meliga and Reijasse (Ref. 72), -: uncontrolled case, *: control in the mixing layer, - -: control at the base/extension junction.

Image of FIG. 11.
FIG. 11.

(Color online) Azimuthal evolution of the mean pressure coefficient. : Deprés et al. (Ref. 7) (kulites), Δ: Deprés et al. (Ref. 7) (steady tabs), •: Meliga and Reijasse (Ref. 72), -: uncontrolled case, *: control in the mixing layer, - -: control at the base/extension junction.

Image of FIG. 12.
FIG. 12.

(Color online) Streamwise evolution of the rms pressure coefficient. : Deprés et al. (Ref. 7) (kulites), •: Meliga and Reijasse (Ref. 72), -: uncontrolled case, *: control in the mixing layer, - -: control at the base/extension junction.

Image of FIG. 13.
FIG. 13.

(Color online) Azimuthal evolution of the rms pressure coefficient. : Deprés et al. (Ref. 7) (kulites), •: Meliga and Reijasse (Ref. 72), -: uncontrolled case, *: control in the mixing layer, - -: control at the base/extension junction.

Image of FIG. 14.
FIG. 14.

(Color online) Unsteady behaviour of the backflow maxima at in a plane (). -•: uncontrolled case, -•: near the early stages of the shear layer (ESSL), -•: at the base/extension junction (BEJ) . - - : Mean values of the backflow maximum.

Image of FIG. 15.
FIG. 15.

(Color online) Maps of dimensionless Power Spectral Density for the dimensionless frequency on the whole extension for the reference and controlled configurations.

Image of FIG. 16.
FIG. 16.

(Color online) Maps of the dimensionless Power Spectral Density of the fluctuating normal velocity with .

Image of FIG. 17.
FIG. 17.

(Color online) Spectra of the first two azimuthal pressure modes , for the streamwise location . : Deprés et al. (Ref. 71), •: Meliga and Reijasse (Ref. 72), -: (REF), : (ESSL), - -: (BEJ).

Image of FIG. 18.
FIG. 18.

(Color online) Spectral maps of the azimuthal pressure modes and for every streamwise location along the extension in function of nondimensional frequencies. - -: spatial limits of the absolute area for determined by Weiss et al.

Image of FIG. 19.
FIG. 19.

(Color online) Power spectral density of the -component of the buffet load. : (REF), : (ESSL), - -: (BEJ) .

Tables

Generic image for table
Table I.

Studies exhibiting two-dimensional forcing acting on the upstream separating boundary layer. Configuration : 2D BFS : 2D Backward Facing Step, F : Fence, AC : Axisymmetric Cylinder, Forcing method : OF : Oscillating Flap, OJ : Oscillating Jet, AF : Acoustic Forcing, RC : Rotating Cylinder.

Generic image for table
Table II.

Studies exhibiting three-dimensional forcing acting on the upstream separating boundary layer. Configuration : 2D BFS : 2D Backward Facing Step, ABB : Axisymmetric Bluff Body, PBB : Plane Bluff Body, CC : Circular Cylinder, Forcing method : OJ : Oscillating Jet, WG : Wake Generator, T : Tabs, R : Rods, C : Cone, WTE : Wavy Trailing Edge, SK : Serrated Skirt.

Generic image for table
Table III.

Studies exhibiting two-dimensional forcing acting directly on the wake. Configuration : 2D BFS : 2D Backward Facing Step, PBB : Plane Bluff Body, ABB : Axisymmetric Bluff Body, D : Disc, Forcing method : AF : Acoustic Forcing, SJ : Synthetic Jet, SP : Splitter Plate, BB : Base Bleed.

Generic image for table
Table IV.

Studies exhibiting three-dimensional forcing acting directly on the wake. Configuration : 2D BFS : 2D Backward Facing Step, ABB : Axisymmetric Bluff Body, Forcing method : PS : Permeable Surface, R : Rods.

Generic image for table
Table V.

Levels of validation of the reference calculation. , .

Generic image for table
Table VI.

Grid characteristics.

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/content/aip/journal/pof2/23/9/10.1063/1.3614481
2011-09-06
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Control of the antisymmetric mode (m = 1) for high Reynolds axisymmetric turbulent separating/reattaching flows
http://aip.metastore.ingenta.com/content/aip/journal/pof2/23/9/10.1063/1.3614481
10.1063/1.3614481
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