Theoretical investigation of natural convection heat transfer in inclined and fully divided CO 2 enclosures on Mars

•Three flow regimes successively form in the enclosure as the tilt angle increases.•The transition regime is the most unstable regime.•The partition can advance the formation of the single-cell regime.•The opposite effect of partitions on the first and third regimes is explained.•Partition can moderate the fluctuation of the heat flux for various angles.