Dynamics of an unsteady turbulent boundary layer
Abstract
The present investigation is concerned with the response of a welldefined, steady, flatplate turbulent boundary layer subjected subsequently to two types of oscillations of the freestream velocity in the test section. It is found that the mean velocity profile in the boundary layer is unaffected by imposed freestream oscillations in the range of frequencies employed. It is the same as the one measured with a freestream velocity distribution held steady at its mean value. The behavior of the mean velocity field is a consequence of two observations. The timeaveraged Reynolds stress distribution across the boundry layer is unaffected by the imposed oscillations. The Reynolds stresses arising from the organized velocity fluctuations under imposed oscillatory conditions are negligible compared to Reynolds stress due to the random fluctuations.
 Publication:

Turbulent Shear Flows 3
 Pub Date:
 1982
 Bibcode:
 1982tsfi.symp...34P
 Keywords:

 Computational Fluid Dynamics;
 Flow Velocity;
 Turbulent Boundary Layer;
 Unsteady Flow;
 Free Flow;
 Reynolds Stress;
 Stress Distribution;
 Velocity Distribution;
 Velocity Measurement;
 Fluid Mechanics and Heat Transfer