Numerical simulation of jet instabilities and plane mixing layers
Abstract
Numerical simulations of jets and mixing layers were performed based on the superposition of small disturbances on baseline velocity profiles. Vortex maps and passive temperature maps are presented. Finite difference methods are used to simulate a twodimensional mixing layer with periodic boundary conditions for Reynolds numbers of 1000 and 10,000. A Bickleytype jet profile (Lessieur et al., 1988) is also considered. For the case of a twodimensional mixing layer, coherent turbulent structures appear which have broadband spectra. For the threedimensional case, a submesh turbulent viscosity is noted which allows large Reynolds numbers to be achieved. Special attention is given to the interaction between largescale coherent structures and smallscale threedimensional turbulence.
 Publication:

AAAF
 Pub Date:
 October 1988
 Bibcode:
 1988aaaf.meetR....L
 Keywords:

 Computerized Simulation;
 Flow Stability;
 Flow Velocity;
 Jet Flow;
 Mixing Layers (Fluids);
 Turbulence Models;
 Finite Difference Theory;
 High Reynolds Number;
 Shear Flow;
 Three Dimensional Flow;
 Two Dimensional Flow;
 Velocity Distribution;
 Fluid Mechanics and Heat Transfer