TY - GEN
T1 - On harmonic perturbations in a turbulent mixing layer
AU - Lifshitz, Yuli
AU - Degani, David
AU - Tumin, Anatoli
N1 - Funding Information:
The authors are grateful to Professor I. Wygnanski for attracting their interest to the problem of the turbulent mixing layer and for useful discussions of the results. N. Reau thanks the Embassy of France for the support he received during his stay at Tel-Aviv within the framework of the CSN program. This research was supported by a grant from the German–Israeli Foundation for Scientific Research and Development (GIF).
PY - 2004
Y1 - 2004
N2 - The problem of coherent perturbations in a turbulent mixing layer is revisited. The governing equations for perturbations are derived from the RANS equations with a Boussinesq-type closure model. The proposed theoretical model utilizes the idea of separating the "fast" and the "slow" scales in a manner similar to the PSE concept. However, the equations for the amplitude functions are not simplified (not parabolized). Emulation of an actuator (oscillating flap) is introduced into the computational analysis via inhomogeneous boundary conditions. The actuator size and amplitude, the effect of coherent perturbation on the base flow, and the non-linear effects in the development of the coherent signal are investigated.
AB - The problem of coherent perturbations in a turbulent mixing layer is revisited. The governing equations for perturbations are derived from the RANS equations with a Boussinesq-type closure model. The proposed theoretical model utilizes the idea of separating the "fast" and the "slow" scales in a manner similar to the PSE concept. However, the equations for the amplitude functions are not simplified (not parabolized). Emulation of an actuator (oscillating flap) is introduced into the computational analysis via inhomogeneous boundary conditions. The actuator size and amplitude, the effect of coherent perturbation on the base flow, and the non-linear effects in the development of the coherent signal are investigated.
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U2 - 10.2514/6.2004-2653
DO - 10.2514/6.2004-2653
M3 - Conference contribution
AN - SCOPUS:85087606099
SN - 9781624100314
T3 - 34th AIAA Fluid Dynamics Conference and Exhibit
BT - 34th AIAA Fluid Dynamics Conference and Exhibit
PB - American Institute of Aeronautics and Astronautics Inc.
T2 - 34th AIAA Fluid Dynamics Conference and Exhibit 2004
Y2 - 28 June 2004 through 1 July 2004
ER -