Natural Convection in a Differentially Heated Square Enclosure with a Solid Polygon

Table 1

Grid sensitivity check at 𝑁=5, 𝑋₀=0.5, 𝐴=𝜋/25, Ra=10⁵, and 𝐾_𝑟=1.

Predefined mesh size	Mesh elements	Nu	CPU time (s)
Extremely coarse	261	4.4311	2
Extra coarse	459	4.4860	2
Coarser	677	4.5051	2
Coarse	1309	4.5101	2
Normal	1973	4.5120	2
Fine	2969	4.5162	2
Finer	8871	4.5193	3
Extra fine	24827	4.5195	6
Extremely fine	32411	4.5201	7