The calculation of low Reynolds number turbulent wall jets
Abstract
Turbulent cylindrical wall jets at low Re are studied numerically. Attention is focused on a simple turbulence model based on Prandtl's mixing length hypothesis normally used to predict boundary layer flows at high Re. The Re range of interest is below 5000. Continuity and momentum equations are defined, together with boundary conditions and an eddy viscosity term, the latter to relate shear stress to the mean velocity. The governing equations are solved using an implicit forward marching finite difference scheme. A comparison with experimental data reveals overpredictions of the rate of jet spread and local maximum velocities. Neglecting damping effects in the nearwall region improves the accuracy of the turbulence model.
 Publication:

Developments in Mechanics. Volume 12
 Pub Date:
 1983
 Bibcode:
 1983deme...12..325R
 Keywords:

 Boundary Layer Flow;
 Low Reynolds Number;
 Nozzle Geometry;
 Shear Flow;
 Turbulent Jets;
 Wall Jets;
 Boundary Conditions;
 Finite Difference Theory;
 High Reynolds Number;
 Mixing Length Flow Theory;
 Turbulence Models;
 Fluid Mechanics and Heat Transfer