Laminarization of the turbulent boundry layer acceleration.

Thesis: Sc. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1965Sc. D.Sc. D. Massachusetts Institute of Technology, Department of Mechanical Engineerin

Argonne National Laboratory Reports

A quasi-continuum model for turbulent momentum and heat transport in large rod bundles has been developed. This model has been derived from a sub-channel analysis and adapted to a quasi-continuum form by introducing concepts of porosity and distributed resistance. The effects of turbulent kinetic energy generation due to shear, viscosity, diffusion, geometric effects, buoyancy, and Reynolds number are explicitly included. The proposed model of turbulence is relatively simple, yet it is believed to provide a framework for taking account of important turbulent mechanisms in rod bundles

Argonne National Laboratory Reports

This report develops a general single-point closure scheme for calculating the local levels of turbulent fluxes of momentum and heat in liquid-metal flows. Transport effects are accounted for by way of the three scalar quantities: turbulent kinetic energy; turbulence-energy dissipation rate; and scalar energy (or half the mean temperature variance). Their values at any point in the flow are obtained from the solution of conservation equations of transport type for each of the three quantities. The turbulent momentum fluxes (Reynolds stresses) and heat-transport rates are then obtained from the algebraic formulas containing the above scalar quantities and the mean velocity and temperature fields

RANS modelling of some strongly swirling aerospace flows

Progress is reported on the modelling, via RANS closures, of two swirling turbulent flows important in aeronautics: the trailing wing-tip vortex and the flow in rotor-stator cavities. For the former the decay of the vortex is only well captured at second-moment level while, for the latter, an unsteady flow computation brings out large-scale organized structures, with the number of structures varying with cavity aspect ratio and Reynolds number, a result qualitatively in accord with experiment