Direct simulation of turbulent pulsed plane channel flows
Abstract
A study on the behavior of turbulent wall shear flows submitted to time dependent external forces is presented. Experimental studies and theoretical considerations give some insight into the influence of an imposed unsteadiness on turbulent motions in the case of pulsed plane channel and boundary layer flows: the time averaged turbulent quantities seem to be unaffected by the imposed periodical forces, mostly at high frequencies, and the phase averaged quantities follow merely the evolution of the linear viscous Stokes solution on the major part of the flow domain. The completion of these experimental results by means of numerical direct simulation is addressed. This numerical work, completed in the case of a pulsed plane channel flow at a mean Reynolds number 2000 for the steady case, shows that nonlinear interactions can be found between the turbulent flow and the imposed unsteadiness, in the range of low frequencies where the computations were performed.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 November 1991
 Bibcode:
 1991STIN...9310860R
 Keywords:

 Channel Flow;
 Computerized Simulation;
 Shear Flow;
 Stokes Flow;
 Turbulence Models;
 Turbulent Flow;
 Wall Flow;
 Flow Distribution;
 Flow Equations;
 NavierStokes Equation;
 Stress Distribution;
 Time Dependence;
 Velocity Distribution;
 Fluid Mechanics and Heat Transfer