Calculation of boundary layers with sudden transverse strain
Abstract
Modifications to a Reynolds stress closure are proposed in which the weighting of the two components of the pressurestrain correlation is adjusted: the turbulence part is increased to conform with measured rates of return to isotropy and the contribution from the meanstrain part is reduced. Consequential changes are then needed in the other closure assumptions. Their effect is to make the model more generally applicable and to improve predictions of turbulent flows in complex strain fields. The revised model is tested here against the measured response of axisymmetric boundary layers to suddenly imposed rotation. The wall region of this flow is resolved by means of walk functions where it is assumed that the directions of the shear stress and the meanstrain rate are coincident.
 Publication:

ASME Journal of Fluids Engineering
 Pub Date:
 December 1986
 Bibcode:
 1986ATJFE.108..470G
 Keywords:

 Computational Fluid Dynamics;
 Flow Velocity;
 Reynolds Stress;
 Turbulent Boundary Layer;
 Axial Flow;
 Closure Law;
 Cylindrical Bodies;
 Shear Stress;
 Strain Distribution;
 Wall Flow;
 Weighting Functions;
 Fluid Mechanics and Heat Transfer