Calculation of unsteady twodimensional laminar and turbulent boundary layers with fluctuations in external velocity
Abstract
A numerical method is proposed for calculating unsteady twodimensional laminar and turbulent boundary layers with allowance for fluctuations in external flow velocity. An eddyviscosity formulation is used to model the Reynolds shear stress term appropriate to turbulent flow, and the governing boundary layer equations are solved by a twopoint finitedifference scheme. For illustration, the method is applied to the calculation of the phase angles between the shear stress at the wall and an oscillating external laminar boundary layer on a flat plate. The effectiveness of the method (for engineering purposes) is demonstrated by comparing calculations for turbulent flows with experimental data.
 Publication:

Proceedings of the Royal Society of London Series A
 Pub Date:
 June 1977
 DOI:
 10.1098/rspa.1977.0096
 Bibcode:
 1977RSPSA.355..225C
 Keywords:

 Finite Difference Theory;
 Flat Plates;
 Laminar Boundary Layer;
 Turbulent Boundary Layer;
 Two Dimensional Boundary Layer;
 Unsteady Flow;
 Eddy Viscosity;
 Flow Velocity;
 Oscillating Flow;
 Reynolds Stress;
 Shear Stress;
 Wall Flow;
 Fluid Mechanics and Heat Transfer