“…Lam et al [4] reported similar experimental and numerical results for a trapezoidal cavity composed of two vertical adiabatic sidewalls, a horizontal hot bottom wall, and an inclined cold top wall. Karyakin [5] reported on transient natural convection in a trapezoidal cavity with parallel top and bottom walls and inclined sidewalls. Lee [6,7] and Peric [8] presented numerical results (up to a Rayleigh number of 10 5 ) for laminar natural convection in trapezoidal enclosures of horizontal, insulated bottom and top walls and inclined sidewalls that are maintained at different uniform temperatures.…”