Progress in the development of a two-fluid model of turbulence for near-wall flows. Part 3: Preliminary investigation of a stably-stratified boundary layer

A compressible form of the two-fluid turbulence model is postulated. It includes buoyancy effects in the momentum equation and in the determination of the fragment size. The model is applied to a wall boundary-layer flow at low Mach number, with the difference between the stream and wall temperatures large enough for fluid properties to vary. Results show a substantial reduction in intermittency factors across the boundary layer compared with results for the case with no buoyancy. The intermittency factor and effective viscosity (and hence the turbulence level and heat flux) appear to decay with downstream distance.