This is the 4th edition of a book originally published by Kluwer
Academic Publishers. It is an exhaustive monograph on turbulence in
fluids in its theoretical and applied aspects, with many advanced
developments using mathematical spectral methods (two-point closures
like the EDQNM theory), direct-numerical simulations, and large-eddy
simulations. The book is still of great actuality on a topic of great
importance for engineering and environmental applications, and presents
a very detailed presentation of the field. The fourth edition
incorporates new results coming from research work done since 1997. Many
of these results come from direct and large-eddy simulations methods,
which have provided significant advances in problems such as turbulent
mixing or thermal exchanges (with and without gravity effects).