Elements of the Theory of Turbulence
All the flows considered above were regular or “laminar” ones. The origin of the term is due to the fact that if one marks fluid with dye, then one can see laminar currents in such flows. Flows are always laminar, according to experiment, if their velocities are sufficiently small. On the other hand, a laminar flow always turns into a turbulent one if the velocity increases. Turbulent flow is essentially irregular. Its velocity, pressure and other parameters vary in a random way at any point, even when the boundary and all other external conditions are regular. This chapter contains the basic theory of turbulence.
KeywordsVortex Vorticity Eter Autocorrelation Convolution
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