Effect of roughness on threedimensional turbulent boundary layers
Abstract
The paper describes a threedimensional boundary layer experiment on a rough surface. The data obtained are compared to a reference experiment having the same geometry and flow conditions but with a smooth surface. The boundary layer data are compared using scaling criteria developed from twodimensional flows. It is found that the results, in terms of scaled variables, agree well in regions where pressure gradients are the dominant cause of threedimensionality. In regions where shear stresses are more important, significant deviations in profile characteristics appear. A possible interpretation is that the degree of anisotropy is greater in threedimensional rough boundarylayer flows than in the corresponding smoothwall case.
 Publication:

IN: Symposium on Numerical and Physical Aspects of Aerodynamic Flows
 Pub Date:
 1983
 Bibcode:
 1983snpa.proc.....K
 Keywords:

 Boundary Layer Separation;
 Surface Roughness Effects;
 Three Dimensional Boundary Layer;
 Turbulent Boundary Layer;
 Turbulent Wakes;
 Blunt Bodies;
 Flow Velocity;
 Pressure Gradients;
 Shear Stress;
 Skin Friction;
 Wall Flow;
 Fluid Mechanics and Heat Transfer