Natural convection effects in solar stills

The physical problem concerns a two-dimensional incompressible fluid flow generated inside a triangular enclosure with isotherm upper walls and heated bottom. The hydrodynamic and thermal fields, the local Nusselt number, the temperature profile at the bottom and at the center of the cavity are investigated for a large range of Rayleigh number. The effect of the upper sides inclination is examined for the particular value of Ra=105.