Results of a three-dimensional unsteady computational study of a row of jets injected normal to a crossflow are presented with the aim of understanding the dynamics of the large-scale structures in the region near the jet. The jet to crossflow velocity ratio is 0.5. A modified version of the computer program (INS3D), which utilizes the method of artificial compressibility, is used for the computations. Results obtained clearly indicate that the near-field large-scale structures are extremely dynamic in nature, and undergo breakup and reconnection processes. The dynamic near-field structures identified include the counterrotating vortex pair (CVP), the horseshoe vortex, wake vortex, wall vortex, and shear layer vortex. The dynamic features of these vortices are presented in this paper. The CVP is observed to be a convoluted structure interacting with the wall and horseshoe vortices. The shear layer vortices are stripped by the crossflow, and undergo pairing and stretching events in the leeward side of the jet. The wall vortex is reoriented into the upright wake system. Comparison of the predictions with mean velocity measurements is made. Reasonable agreement is observed.

1.
Ajersch
P.
,
Zhou
J. M.
,
Ketler
S.
,
Salcudean
M.
, and
Gartshore
I. S.
,
1997
, “
Multiple Jets in a Crossflow: Detailed Measurements and Numerical Simulations
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
119
, pp.
330
342
.
2.
Andreopoulos
J.
,
1985
, “
On the structure of jets in a crossflow
,”
J. Fluid Mech.
, Vol.
157
, pp.
163
197
.
3.
Andreopoulos
J.
, and
Rodi
W.
,
1984
, “
Experimental investigation of jets in a crossflow
,”
J. Fluid Mech.
, Vol.
138
, pp.
93
127
.
4.
Chorin
A. J.
,
1968
, “
Numerical Solution of the Navier–Stokes Equations
,”
Math. Comput.
, Vol.
22
, pp.
745
762
.
5.
Crabb
D.
,
Durao
D. F. G.
, and
Whitelaw
J. H.
,
1981
, “
A round jet normal to a crossflow
,”
ASME Journal of Fluids Engineering
, Vol.
103
, pp.
142
153
.
6.
Demuren
A. O.
,
1993
, “
Characteristics of three-dimensional jets in crossflow
,”
Int. J. Engng. Sci.
, Vol.
31
, No.
6
, pp.
899
913
.
7.
Fornberg
B. G.
,
1988
, “
Generation of finite difference formulas on arbitrarily spaced grids
,”
Mathematics of Computations
, Vol.
31
, No.
184
, pp.
699
706
.
8.
Foss, J., 1980, “Interaction region phenomena for the jet in a crossflow problem,” Rep. SFB 80/E/161, Univ. Karlsruhe, Germany.
9.
Fric
T. F.
, and
Roshko
A.
,
1994
, “
Vortical structure in the wake of a transverse jet
,”
J. Fluid Mech.
, Vol.
279
, pp.
1
47
.
10.
Garg, V. K., and Gaugler, R. E., 1994, “Prediction of film cooling on gas turbine airfoils,” ASME Paper No. 94-GT-16.
11.
Garg
V. K.
, and
Gaugler
R. E.
,
1997
, “
Effect of velocity and temperature distribution at the hole exit on film cooling of turbine blades
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
119
, pp.
343
351
.
12.
Ho
C. M.
, and
Huerre
P.
,
1984
, “
Perturbed Shear Layers
,”
Ann. Rev. Fluid Mech.
, Vol.
16
, pp.
365
424
.
13.
Hyams, D. G., and Leylek, J. H., 1997, “A detailed analysis of film-cooling physics: Part III—streamwise injection with shaped holes,” ASME Paper No. 97-GT-271.
14.
Jones, W. P., and Wille, M., 1996, “Large eddy simulation of a round jet in crossflow,” Engineering Turbulence Modeling and Experiments 3, Rodi, W., and Bergeles, G., eds., pp. 199–209.
15.
Kamotani
Y.
, and
Gerber
I.
,
1972
, “
Experiments on a turbulent jet in crossflow
,”
J. Fluid Mech.
, Vol.
306
, pp.
111
114
.
16.
Kelso
R. M.
,
Lim
T. T.
, and
Perry
A. E.
,
1996
, “
An Experimental Study of Round Jets in Cross-Flow
,”
J. Fluid Mech.
, Vol.
306
, pp.
111
144
.
17.
Kim
S. W.
, and
Benson
T. J.
,
1992
, “
Calculation of a circular jet in crossflow with a multiple-time-scale turbulence model
,”
Int. J. Comp. Phys.
, Vol.
59
, p.
308
308
.
18.
McGovern, T. K., and Leylek, J. H., 1997, “A detailed analysis of film-cooling physics, Part II: compound-angle injection with cylindrical holes,” ASME Paper No. 97-GT-270.
19.
Moussa
Z. M.
,
Trischka
J. W.
, and
Eskinazi
S.
,
1977
, “
The near field in the mixing of a round jet with a cross-stream
,”
J. Fluid Mech.
, Vol.
80
, pp.
49
80
.
20.
Patankar
S. V.
,
Basu
D. K.
, and
Alpay
S. A.
,
1977
, “
Prediction of the three-dimensional velocity field of a deflected turbulent jet
,”
Trans. SME I: J. Fluids Engng.
99
, pp.
758
762
.
21.
Rogers
S.
, and
Kwak
D.
,
1991
, “
Steady and Unsteady Solutions of the Incompressible Navier–Stokes Equations
,”
AIAA Journal
, Vol.
29
, No.
4
, pp.
603
610
.
22.
Singer
B. A.
,
1994
, “
Metamorphosis of a hairpin vortex into a young turbulent spot
,”
Phys. Fluids
, Vol.
6
, No.
11
, pp.
3724
3736
.
23.
Sykes
R. I.
,
Lewellen
W. S.
, and
Parker
S. F.
,
1986
, “
On the vorticity dynamics of a turbulent jet in a crossflow
,”
J. Fluid Mech.
, Vol.
80
, pp.
49
80
.
24.
Walters, D. K., and Leylek, J. H., 1997, “A detailed analysis of film-cooling physics: Part I—streamwise injection with cylindrical holes,” ASME Paper No. 97-GT-269.
25.
Yuan
L. L.
, and
Street
R. L.
,
1999
, “
Large Eddy Simulation of a Round Jet in Crossflow
,”
J. Fluid Mech.
, Vol.
379
, pp.
71
104
.
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