Unsteady incompressible turbulent boundary layer flow over a longitudinal cylinder
Abstract
An analytical model is developed for unsteady turbulent boundarylayer flow over a cylinder in the presence of fluctuating and accelerating flow velocities. An eddyviscosity treatment which allows for unsteady flow is used for the model, which accounts for the in and outofphase velocity components. The governing partial differential equations with three independent variables are solved with an implicit finite difference scheme. Calculations made with the model are compared with experimental results for the differences between in and outofphase flow velocities, the variation of the skin friction coefficient (SFC), the shape factor and Re over time and distance. Among other results, it was found that in laminar flows the SFC decreases with streamwise distance while Re increases at the same time with respect to the displacement and momentum thicknesses. In oscillating flows, the SFC and Re fluctuate over distance, and increase over distance in accelerating flows.
 Publication:

Acta Technica
 Pub Date:
 1986
 Bibcode:
 1986AcTec..31..328K
 Keywords:

 Computational Fluid Dynamics;
 Cylindrical Bodies;
 Flow Deflection;
 Incompressible Boundary Layer;
 Turbulent Boundary Layer;
 Unsteady Flow;
 Finite Difference Theory;
 Free Flow;
 Partial Differential Equations;
 Reynolds Stress;
 Skin Friction;
 Time Dependence;
 Velocity Distribution;
 Wall Flow;
 Fluid Mechanics and Heat Transfer