This chapter is devoted to the viscous fluid flows, which are described by the Navier—Stokes equations. We derive the Navier—Stokes equations in the Cartesian, cylindrical, and spherical coordinate systems and consider their exact solutions at small Reynolds numbers. We present the Prandtl’s theory of boundary layer, which is valid at large Reynolds numbers. This theory enables one to calculate the drag force acting on a plate in the viscous fluid flow. We also outline the theory for the transition from laminar viscous fluid flow to turbulent flow and discuss a number of the semiempirical theories of turbulence.
KeywordsBoundary Layer Fluid Flow Viscous Fluid Critical Reynolds Number Spherical Coordinate System
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