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This book on the general topic of hydro and aerodynamics of viscous fluids at subsonic speeds discusses a set of applications where the constrained geometry of the flow requires specific theoretical approaches. The first part deals with several problems of channel flows, inspired, for example, by the dissipation of mechanical energy (the so-called hydrodynamic erosion or channelized effect) in commercial oil pipelines. It also addresses the theory of flow in channels with porous walls, an important topic in chemical engineering. The second part starts by investigating the problem of high-temperature jets, and the resulting solutions demonstrate the impact of the Prandtl number and show the power-law temperature dependence of the viscosity of the gas. The subsequent study of wake flows of variable density reveals surprising turbulent mixing properties, characterized by the dependence of the process on turbulent transport as determined by the initial parameters of the free jet (dynamical invariance). The third part presents the results of theoretical and experimental research on the formation and development of concentrated vortex structures, with the appearance of free Taylor-Goertler vortices. The mechanism of their formation is reviewed, and on the basis of this, the correct explanation of a number of phenomena misinterpreted in the current literature is given. Finally, the theory of vortex rings is developed.