TY - GEN
T1 - Downstream evolution of the most energetic POD modes in the mixing layer of a high reynolds number axisymmetric jet
AU - Jung, Daehan
AU - Gamard, Stephan
AU - George, William K.
AU - Woodward, Scott H.
PY - 2002
Y1 - 2002
N2 - Experimental results were obtained in the potential core region of an axisymmetric turbulent jet from 2 to 6 diameters downstream, at Reynolds numbers of 78,400, 117,600, and 156,800. Data were collected using the 138 hot-wire probe used by Citriniti and George (2000). The Proper Orthogonal Decomposition was then applied to a double Fourier transform in time and azimuthal direction of the double velocity correlation tensor. The lowest azimuthal mode for all POD modes, which dominated the dynamics at x / D = 3 in the previous experiments, dies off rapidly downstream. This is consistent with a trend toward homogeneity in the downstream evolution, and suggests that some residual value may control the growth rate of the far jet. On the other hand, for the higher azimuthal modes, the peak shifts to lower mode numbers and actually increases with downstream distance. These mixing layer data, normalized by similarity variables for the mixing layer, collapse at all downstream positions and are nearly independent of Reynolds numbers.
AB - Experimental results were obtained in the potential core region of an axisymmetric turbulent jet from 2 to 6 diameters downstream, at Reynolds numbers of 78,400, 117,600, and 156,800. Data were collected using the 138 hot-wire probe used by Citriniti and George (2000). The Proper Orthogonal Decomposition was then applied to a double Fourier transform in time and azimuthal direction of the double velocity correlation tensor. The lowest azimuthal mode for all POD modes, which dominated the dynamics at x / D = 3 in the previous experiments, dies off rapidly downstream. This is consistent with a trend toward homogeneity in the downstream evolution, and suggests that some residual value may control the growth rate of the far jet. On the other hand, for the higher azimuthal modes, the peak shifts to lower mode numbers and actually increases with downstream distance. These mixing layer data, normalized by similarity variables for the mixing layer, collapse at all downstream positions and are nearly independent of Reynolds numbers.
KW - Energy
KW - Jet
KW - Proper Orthogonal Decomposition
KW - Turbulence
UR - https://www.scopus.com/pages/publications/84892865992
U2 - 10.1007/978-94-017-1998-8_2
DO - 10.1007/978-94-017-1998-8_2
M3 - Conference contribution
SN - 9789048160747
T3 - Fluid Mechanics and its Applications
SP - 23
EP - 32
BT - IUTAM Symposium on Turbulent Mixing and Combustion - Proceedings of the IUTAM Symposium
T2 - International Union of Theoretical and Applied Mechanics Symposium on Turbulent Mixing and Combustion
Y2 - 3 June 2001 through 6 June 2001
ER -