For a better understanding of turbulent structure, a new flow visualization method of the time averaged structure of the turbulence has been developed by using wall pressure fluctuations to detect the velocity fluctuations of the flow. Velocity fluctuations were visualized by the measured velocity-wall pressure cross-correlation with the whole flow field for various time-delays between two measured values. Turbulence structures of a backward-facing step flow were investigated for three different flow regions—the recirculating flow just behind the step, the reattachment flow, and the boundary layer flow far down stream from the step. Sequential contour maps of cross-correlation values were calculated to display movement and deformation of turbulent structures both qualitatively and quantitatively.

1.
Adrian
R. J.
,
1986
, “
Multi-Point Optical Measurements of Simultaneous Vectors in Unsteady Flow—A Review
,”
International Journal of Heat and Fluid Flow
, Vol.
7
, No.
2
, pp.
127
145
.
2.
Didden
N.
, and
Ho
C. M.
,
1985
, “
Unsteady Separation in a Boundary Layer Produced by an Impinging Jet
,”
Journal of Fluid Mechanics
, Vol.
160
, pp.
235
256
.
3.
Dinkelacker
A.
,
Hessel
M.
,
Meier
G. E. A.
, and
Schewe
G.
,
1977
, “
Investigation of Pressure Fluctuations Beneath a Turbulent Boundary Layer by Means of an Optical Method
,”
Physics of Fluids
, Vol.
20
, Part II, pp.
216
224
.
4.
Hijikata, K., and Mimatu, J., 1985, “Holographic Visualization of Pressure Distribution on the plate by Jet Impingement,” Proceedings of the International Symposium on Fluid Control and Measurement, Tokyo, pp. 685–690.
5.
Hijikata, K., and Mimatu, J., 1987, “Turbulent Structure Near the Stagnation Point of an Axisymmetric Impinging Jet,” Proceedings of the 6th Symposium on Turbulent Shear Flow, Toulouse, pp. 221–226.
6.
Hussain
A. K. M. F.
, and
Clark
A. R.
,
1981
, “
On the Coherent Structure of the Axisymmetric Mixing Layer: A Flow-Visualization Study
,”
Journal of Fluid Mechanics
, Vol.
104
, pp.
263
294
.
7.
Johansson
A. V.
,
Her
J.-Y.
, and
Haritonidis
J. H.
,
1987
, “
On the Generation of High-Amplitude Wall-Pressure Peaks in Turbulent Boundary Layers and Spots
,”
Journal of Fluid Mechanics
, Vol.
175
, pp.
119
142
.
8.
Kim
J.
, and
Hussain
J.
,
1993
, “
Propagation Velocity of Perturbations in Turbulent Channel Flow
,”
Physics of Fluids A
, Vol.
5
, pp.
695
706
.
9.
Kobashi
Y
, and
Ichijo
M.
,
1986
, “
Wall Pressure and its Relation to Turbulent Structure of a Boundary Layer
,”
Experiments in Fluids
, Vol.
4
, pp.
49
55
.
10.
Schewe
G.
,
1983
, “
On the Structure and Resolution of Wall-Pressure Fluctuations Associated with turbulent Boundary-Layer Flow
,”
Journal of Fluid Mechanics
, Vol.
134
, pp.
311
328
.
11.
Talomon
A. M.
,
Kunen
J. M. G.
, and
Ooms
G.
,
1986
, “
Simultaneous Flow Visualization and Reynolds-Stress Measurement in a Turbulent Boundary Layer
,”
Journal of Fluid Mechanics
, Vol.
163
, pp.
459
478
.
12.
Yule
A. J.
,
1978
, “
Large-Scale Structure in the Mixing Layer of a Round Jet
,”
Journal of Fluid Mechanics
, Vol.
89
, Part 3, pp.
413
432
.
This content is only available via PDF.
You do not currently have access to this content.