Abstract
Two- and three-dimensional nonstationary viscous fluid flows in the plane channels and pipes are considered. By means of efficient computational algorithms for direct integration of the incompressible Navier-Stokes equations the classes of two- and three-dimensional nonstationary flows with the stationary integral characteristics are found. They are called the secondary flows. 2-D secondary flows have only qualitative similarity to the turbulent flows observed in experiments. 3-D secondary flows agree rather well even quantitatively with the turbulent flows.
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