Streak breakdown instability in pipe Poiseuille flow
نویسنده
چکیده
This work is devoted to the study of the stability of Hagen–Poiseuille flow or pipe flow. The analysis is focused on the streak breakdown process by which two-dimensional streamwise-independent finite amplitude perturbations transiently modulate the basic flow leading to a profile that contains saddle points and is linearly unstable with respect to very small streamwise-dependent perturbations. This mechanism is one possible route of transition to turbulence in subcritical shear flows. The exploration is carried out for initial disturbances of different finite amplitudes and axial and azimuthal periodicity. This study covers a wide range of Reynolds numbers and the double threshold curve obtained for transition is consistent with experimental observations. © 2003 American Institute of Physics. @DOI: 10.1063/1.1564093#
منابع مشابه
On Stability of Streamwise Streaks and Transition Thresholds in Plane Channel Flows
Streak breakdown caused by a spanwise in ectional instability is one phase of the following transition scenarios, which occur in plane Poiseuille and Couette ow. The streamwise vortex scenario is described by (SV) streamwise vortices =) streamwise streaks =) streak breakdown =) transition: The oblique wave scenario is described by (OW) oblique waves =) streamwise vortices =) streamwise streaks ...
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