Figure 1

(a) Physical model of convection in a square cavity, and (b) grid-points distribution in the adiabatic inner block (NY/2 − ND + 1 ≤ j ≤ NY/2 + ND + 1, NX/2 − ND + 1 ≤ i ≤ NX/2 + ND + 1).
(a) Physical model of convection in a square cavity, and (b) grid-points distribution in the adiabatic inner block (NY/2 − ND + 1 ≤ j ≤ NY/2 + ND + 1, NX/2 − ND + 1 ≤ i ≤ NX/2 + ND + 1).