Non-linear coherent mode interactions and the control of shear layersA nonlinear integral formulation, based on local linear stability considerations, is used to study the collective interactions between discrete wave-modes associated with large-scale structures and the mean flow in a developing shear layer. Aspects of shear layer control are examined in light of the sensitivity of these interactions to the initial frequency parameter, modal energy contents and modal phases. Manipulation of the large-scale structure is argued to be an effective means of controlling the flow, including the small-scale turbulence dominated region far downstream. Cases of fundamental, 1st and 2nd subharmonic forcing are discussed in conjunction with relevant experiments.
Document ID
19910071011
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Nikitopoulos, D. E. (Louisiana State University Baton Rouge, United States)
Liu, J. T. C. (Brown University Providence, RI, United States)