In this article, steady natural convection inside a square cavity with wavy surface filled with a porous medium is studied numerically. The temperature for the right wall of the cavity is maintained at TC . The wavy surface wall is located at constant heat flux and the another walls have been considered to be insulated. In present study, the governing equations are solved numerically by finite volume method. The aim of this article is investigation of Darcy and Rayleigh numbers effects on natural convection heat transfer in a wavy wall cavity. A range of parameters such as Rayleigh number (10 3 ≤ Ra≤ 106) and Darcy number (10-5≤ Da ≤ 10-1) are selected. It was found that the Nusselt number increases with increasing both of Rayleigh and Darcy numbers.

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