文档介绍：Preface to the Second Edition
The first edition of this book, Analysis of Turbulent Boundary Layers, was
written in the period between 1970 and early 1974 when the subject of tur-
bulence was in its early stages and that of turbulence modeling in its infancy.
The subject had advanced considerably over the years with greater emphasis
on the use of numerical methods and an increasing requirement and ability to
calculate turbulent two- and three-dimensional flows with and without sepa-
ration. The tools for experimentation were still the traditional Pitot tube and
hot wire-anemometer so that the range of flows that could be examined was
limited putational methods still included integral methods and a small
range of procedures based on the numerical solution of boundary layer equa-
tions and designed to match the limited range of measured conditions. There
have been tremendous advances in experimental techniques with the develop-
ment of non-intrusive optical methods such as laser-Doppler, phase-Doppler
and particle-image velocimetry, all for the measurement of velocity and related
quantities and of a wide range of methods for the measurement of scalars. These
advances have allowed an equivalent expansion in the range of flows that have
been investigated and also in the way in which they could be examined and in-
terpreted. Similarly, the use of numerical methods to solve time-averaged forms
of the Navier-Stokes equations, sometimes interactively with the inviscid-flow
equations, has expanded, even more so with the rise and sometimes fall -
panies that wished to promote and sell puter codes. The result
of these developments has been an enormous expansion of the literature and
has provided a great deal of information beyond that which was available when
the first edition was written. Thus, the topics of the first edition needed to be
re-examined in the light of new experiments and calculations, and the abi