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Turbulence

Turbulence is that state of fluid motion which is characterized by apparently random and chaotic three-dimensional vorticity. When turbulence is present, it usually dominates all other flow phenomena and results in increased energy dissipation, mixing, heat transfer, and drag... more

This excellent introduction to Turbulence, based on a text by Prof. William K. George, is a good start for any beginner in fluid dynamics.