CURRENTLY, THE RATE OF DEVELOPMENT OF COMPUTATIONAL FLUID DYNAMICS IS NO LONGER DEPENDENT ON COMPUTER SIZE OR NUMERICAL TECHNIQUES.

CURRENTLY, THE RATE OF DEVELOPMENT OF COMPUTATIONAL FLUID DYNAMICS IS NO LONGER DEPENDENT ON COMPUTER SIZE OR NUMERICAL TECHNIQUES. FURTHER PROGRESS IS RESTRICTED BY THE NEED FOR RELIABLE TEST CASES AND AN IMPROVED UNDERSTANDING OF BOTH THE PHYSICS AND STRUCTURE OF TURBULENCE IN COMPLEX FLOWS. THIS INFORMATION IS REQUIRED FOR BOTH TIME-AVERAGED NAVIER-STOKES AND LARGE-EDDY SIMULATION CALCULATIONS. IN THE FORMER THE REQUIREMENT IS FOR MODELING THE TURBULENT CORRELATIONS, IN THE LATTER FOR SUBGRID SCALE MODELING. ALTHOUGH THE LASER VELOCIMETER HAS BECOME A PROVEN, NONINSTRUSIVE INSTRUMENT FOR THE MEASUREMENT OF LOCAL MEAN VELOCITIES AND TURBULENCE PROPERTIES, MEASUREMENTS HAVE BEEN OF A MEAN, STATISTICAL NATURE DERIVED FROM AVERAGES ACCUMULATED INDEPENDENTLY AT DIFFERENT POSITIONS IN THE FLOW. THUS, THEY DO NOT GIVE INSTANTANEOUS DYNAMIC, PICTURE OF THE FLOW-FIELD STRUCTURES. IN THIS STUDY, A NEW TECHNIQUE WHICH ENABLES RAPID LASER VELOCIMETER SCANS OF TURBULENT FLOW FIELDS IS INVESTIGATED. THIS NOVEL MODIFICATION TO CURRENT VELOCIMETEROPTICS PROVIDES FOR ADEQUATE SPATIAL AND TEMPORAL RESOLUTION OF THE LARGE AND SMALL SCALE STRUCTURES IN A VARIETY OF TURBULENT FLOWS.