Dm. Manole et Jl. Lage, NONUNIFORM GRID ACCURACY TEST APPLIED TO THE NATURAL-CONVECTION FLOW WITHIN A POROUS-MEDIUM CAVITY, Numerical heat transfer. Part B, Fundamentals, 23(3), 1993, pp. 351-368
The accuracy of numerical results obtained by using nonuniform grid di
stributions is strongly affected by the size of the grid spacing. The
present work focuses on a detailed procedure for the accuracy tests of
the numerical results obtained by using nonuniform grid distributions
. It is shown that the degree of nonuniformity of a certain grid distr
ibution with a fixed number of grid lines also has a strong effect on
the numerical results. For a fixed number of grid lines there is only
one optimum nonuniform grid distribution for each physical case. Furth
ermore, an accurate nonuniform grid for a physical situation with stee
p gradients presents a very low efficiency in terms of CPU time when u
sed for simulating cases with smaller gradients.