A New Way to Generate an Exponential Finite Difference Scheme for 2D Convection-Diffusion Equations

Table 3

Maximum absolute errors and rate of convergence, Example 8 with 𝑃=100.

ℎ=𝑘	UDS		EDS0		EDS
	Errors	Rate	Errors	Rate	Errors	Rate
1/8	3.07𝑒−2		2.37𝑒−2		1.00𝑒−2
1/16	1.75𝑒−2	0.81	8.64𝑒−3	1.46	5.07𝑒−3	0.98
1/32	9.31𝑒−3	0.91	2.51𝑒−3	1.78	1.68𝑒−3	1.60
1/64	4.80𝑒−3	0.96	6.59𝑒−4	1.93	4.48𝑒−4	1.90
1/128	2.44𝑒−3	0.98	1.67𝑒−4	1.98	1.14𝑒−4	1.97
1/256	1.23𝑒−3	0.99	4.19𝑒−5	1.99	2.88𝑒−5	1.98