PREFACE

Turbulence and shear flow phenomena continue to challenge scientists and engineers in very major ways. At the fundamental level numerous Important questions remain unansweredl that require the convergence of theoretical analysis, experimentation and numerical calculation for their full understanding. At the applied level, turbulence and shear flow phenomena clearly have major impact on energy production, transportation, the environment, and the economy, all of which affect the well being of society.

As a consequence, the Fourth International Symposium on Turbulence and Shear Flow Phenomena (TSFP4) is characterized by a large range of topics that collectively reflect much of the current questioning going on in the field Whether fundamental or applied, the answers to these questions broaden the potential for putting turbulence to good use when it is needed, or to avoid it or its consequences when it is not. The topics are: Bio-Fluid-Mechanics, Complex Flows, Compressible Flows, Environmental and Geophysical Flows, Fundamentals, Heat Transfer, Multiphase Flows, Reacting Flows, Scalar Transport, Seperated and Unsteady Flows, Transition, Turbulent Boundarv Layers, Turbulence Control, Experimentnl Methods, Numerical Methods, Hybrrid Methbds, LES, and RANS. Over 200 papers addressingl these topics appear in the pages of these three TSFP4 volumes.

Joseph A. C. Humphrey
TSFP4 Organizing Committee Chair
and
Thomas B. Gatski
TSFP4 Local Executive Committee Chair