We investigate the possibility of manipulating turbulence structures in the viscous sublayer for the purpose of drag reduction using a direct numerical simulation of a turbulent channel flow. Recognizing that a great portion of production of vorticity occurs in the viscous sublayer, a body force is used to suppress spanwise velocity in the sublayer, and a significant amount of drag reduction is obtained. A more realistic body force or wall movement in the spanwise direction using instantaneous wall-shear stress in a closed-loop control is shown to reduce drag as much as 35%. Implementation of such a body force using an electromagnetic force is also discussed.
REFERENCES
1.
H.
Choi
, P.
Moin
, and J.
Kim
, “Active turbulence control for drag reduction in wall-bounded flows
,” J. Fluid Mech.
262
, 75
(1994
).2.
T.
Bewley
and P.
Moin
, “Optimal control of turbulent channel flows
,” Active Control of Vibration and Noise, ASME DE
75
, 221
(1995
).3.
C.
Lee
, J.
Kim
, D.
Babcock
, and R.
Goodman
, “Application of neural networks to turbulence control for drag reduction
,” Phys. Fluids
9
, 1740
(1997
).4.
C.
Lee
, J.
Kim
, and H.
Choi
, “Suboptimal control of turbulent channel flows for drag reduction
,” J. Fluid Mech.
358
, 245
(1998
).5.
P.
Koumoutsakos
, “Vorticity flux control for a turbulent channel flow
,” Phys. Fluids
11
, 248
(1999
).6.
F. Waleffe and J. Kim, “How streamwise rolls and streaks self-sustain in a shear flow,” in Self-Sustaining Mechanisms of Wall Turbulence, edited by R. L. Panton (Computational Mechanics, Southampton, UK, 1997), p. 309.
7.
W. Schoppa and F. Hussain, “Genesis and dynamics of coherent structures in near-wall turbulence: a new look,” in Ref. 6, p. 385.
8.
O. Sendstad and P. Moin, “The near wall mechanics of three-dimensional turbulent boundary layers,” Report No. TF-57, Department of Mechanical Engineering, Stanford University, Stanford, CA, 1992.
9.
J.
Kim
and J.
Lim
, “A linear process in wall-bounded turbulent shear flows
,” Phys. Fluids
12
, 1885
(2000
).10.
J.
Kim
, P.
Moin
, and R. D.
Moser
, “Turbulence statistics in fully developed channel flow at low Reynolds number
,” J. Fluid Mech.
177
, 133
(1987
).11.
J. W.
Brooke
and T. J.
Hanratty
, “Origin of turbulence-producing eddies in a channel flow
,” Phys. Fluids A
5
, 1011
(1993
).12.
P. S. Bernard and J. M. Wallace, “Vortex kinematics, dynamics, and turbulent momentum transport in wall bounded flows,” in Ref. 6, p. 65.
13.
T. J. Hanratty and D. V. Papavassiliou, “The role of wall vortices in producing turbulence,” in Ref. 6, p. 83.
14.
S. Satake and N. Kasagi, “Turbulence control with a wall-adjacent thin layer of spanwise damping force,” in the Tenth Symposium on Turbulent Shear Flows, The Pennsylvania State University, 14–16 August 1995.
15.
The mechanism by which riblet suppresses the near-wall turbulence is similar in a sense that spanwise motion associated with the streamwise vortices is suppressed, hence drag is reduced. See
H.
Choi
, P.
Moin
, and J.
Kim
, “Direct numerical simulation of turbulent flow over riblet
,” J. Fluid Mech.
255
, 503
(1993
).16.
J. M.
Hamilton
, J.
Kim
, and F.
Waleffe
, “Regeneration mechanisms of near-wall turbulence structures
,” J. Fluid Mech.
287
, 317
(1995
).17.
F.
Sherman
, S.
Tung
, C.-J.
Kim
, C.-M.
Ho
, and J.
Woo
, “Flow control by using high-aspect-ratio, in-plane microactuators
,” Sens. Actuators A
73
, 169
(1999
).18.
C.
Henoch
and J.
Stace
, “Experimental investigation of a salt water turbulent boundary layer modified by an applied streamwise magnetohydrodynamic body force
,” Phys. Fluids
7
, 1371
(1995
).19.
T.
Berger
, J.
Kim
, C.
Lee
, and J.
Lim
, “Electromagnetic force control of turbulent boundary layers for drag reduction
,” Phys. Fluids
12
, 631
(2000
).
This content is only available via PDF.
© 2002 American Institute of Physics.
2002
American Institute of Physics
You do not currently have access to this content.
