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Disturbance Dynamics in Transitional and Turbulent FlowsThe dynamics of an ensemble of linear disturbances with a known probability distribution associated with the initial mode amplitudes are studied in boundary-layer flows through an analysis of the transport equations for the mean disturbance kinetic energy and disturbance energy dissipation rate. Effects of adverse and favorable pressure-gradients on the disturbance dynamics are also included in the analysis. Unlike the fully turbulent regime where nonlinear phase scrambling of the fluctuations affects the flow field in proximity to the wall, the laminar regime fluctuations studied here are influenced across the boundary layer by the solid boundary. In addition to the low Reynolds number, early stage transition regime, the dynamics of these disturbance fields can be related in some respects to the near-wall dynamics of the fully turbulent regime.
Document ID
20010018996
Acquisition Source
Langley Research Center
Document Type
Other
Authors
Grosch, C. E. (Old Dominion Univ. Norfolk, VA United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2001
Subject Category
Fluid Mechanics And Thermodynamics
Funding Number(s)
CONTRACT_GRANT: NAG1-2251
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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