A new original technology for numerically analysing hydrodynamic stability is described. Using the example of Poiseuille flows in plane and ribbed channels, it is demonstrated how this technology can be applied to a stability investigation of various flows. The main attention is given to a little-studied scenario of stability loss for significantly subcritical laminar flows of a viscose incompressible liquid where a small disturbance of special type, which causes a large kinetic energy growth due to an interaction with the main flow, arises and transfers the main flow to a quasi-stationary one that is unstable to small disturbances of some different type which destroy this flow and cause the laminar-turbulent transition.
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