The production of turbulent stress in a shear flow by irrotational fluctuations
Abstract
This paper examines, both theoretically and experimentally, the effect produced by irrotational fluctuations, associated with a nearby turbulent field, in a region where the turbulence is initially very low but where there is a mean shear. Calculations are based on rapid distortion theory and experiments use linearized hot wire anemometers in an open circuit wind tunnel. Turbulent shear stress is observed to grow from zero to significant values in the interaction region. The magnitude and extent of this observed shear stress agree reasonably well with predictions of the analysis, when intermittency effects are included. It is concluded that turbulent stresses can be produced by irrotational fluctuations in a region of mean shear and that this effect can be estimated using rapid distortion theory if the overall strain ratio is not large.
 Publication:

Structure of Complex Turbulent Shear Flow
 Pub Date:
 1983
 Bibcode:
 1983scts.proc..388G
 Keywords:

 Potential Flow;
 Shear Flow;
 Shear Stress;
 Turbulent Flow;
 Flow Distortion;
 HotWire Anemometers;
 Reynolds Stress;
 Stress Distribution;
 Fluid Mechanics and Heat Transfer