摘要

The onset of convective instability in a vertical porous layer with open boundaries is analysed. The base flow is partly buoyancy-induced and partly caused by an imposed vertical pressure gradient. The linearised perturbation equations expressing the local mass and energy balances, as well as the momentum balance modelled according to Darcy-Forchheimer's law, are solved numerically in terms of normal modes. The neutral stability curves and the critical Darcy-Rayleigh number are obtained versus the form-drag parameter.