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PHYSICAL properties of turbulence, statistical averages, and techniques used to measure them are described in the first two chapters. Hot-wire anemometry is fully discussed. The next two chapters deal with the kinematics and dynamics of isotropic turbulence, isotropic scalar fields, pressure fluctuations, and anisotropic turbulence. The last three chapters are devoted to transport processes in turbulent flows, free shear flows (jet and wakes), and wall shear flows (channel flows and boundary layers). Any statistical theory consists of two parts. The first is devoted to defining suitable averages which invariably exceed the number of equations relating them. In the second part one complements the equations by assuming certain relations among the average quantities so that the determinate set of equations can be solved. The mam difficulty is in finding these relations guided by experimental facts or intuition. Some have confused statistical formalism with real progress in turbulence. The author avoids this pitfall to a large extent.

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