  We revisit a phenomenological description of turbulent thermal convection
along the lines proposed originally by Gough (1965) in which eddies grow solely
by extracting energy from the unstably stratified mean state and are
subsequently destroyed by internal shear instability. This work is part of an
ongoing investigation for finding a procedure to calculate the turbulent fluxes
of heat and momentum in the presence of a shearing background flow in stars.
