Effects of Inflow Disturbances on Spatially-Evolving Instability in Plane Channel Flow
A computational study examining the effects of varying inflow disturbance conditions on spatially evolving channel flow instability is presented. The inflow conditions consist of a 2-D perturbation wave coupled with a 3-D random noise field. The 2-D amplitude is varied in order to examine the resulting transition characteristics of the channel. At low 2-D amplitudes (A2d = 1.25%) H-type or subharmonic characteristics dominate while at higher amplitudes (A2d = 2.5% and 3.25%) mixed H-and K-type instabilities occur.
KeywordsCritical Layer Secondary Instability Outflow Boundary Condition Plane Poiseuille Flow Spanwise Location
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