Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Physics of Fluids
9 (1997), S. 3258-3266
ISSN:
1089-7666
Source:
AIP Digital Archive
Topics:
Physics
Notes:
A direct numerical simulation was made of instability in a spatially evolving channel flow. A local surface suction/blowing was imposed at the upper wall (x/h=20). A Tollmien–Schlichting (TS) wave was superimposed on the laminar channel flow at the inflow. At the outflow, the buffer domain technique was applied to suppress the reflection of outgoing waves. The influence of the local suction/blowing on the linear and nonlinear instabilities of the flow was examined. It was found that the local suction/blowing increases the disturbance energy significantly in the interaction zone for subcritical (Re=5000) and supercritical (Re=10 000) cases. The effects of the blowing strength (0≤AS≤0.1) and the initial TS wave amplitude (0≤ATS≤2.0) on the subcritical channel flow were scrutinized. Two regimes of the wave/flow interaction were found by varing AS, i.e., "monotonic" and "vortex splitting" regimes. © 1997 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.869423
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