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Theory and Modern Applications

Table 2 Example 2: Poisson’s equations ( 52 ) in r - θ plane

From: A new compact high order off-step discretization for the system of 2D quasi-linear elliptic partial differential equations

h

 

Proposed O( h 4 )-methods

O( h 4 )-Methods discussed in [16, 17]

α = 1

α = 2

α = 1

α = 2

1/8

u

2.3294(−06)

4.6091(−06)

4.2944(−06)

6.8672(−06)

u r

8.1179(−06)

1.6529(−05)

8.8246(−06)

4.2834(−05)

u θ

3.9153(−04)

6.2317(−04)

4.4823(−04)

8.6298(−04)

1/16

u

1.4731(−07)

2.9153(−07)

2.7278(−07)

4.4629(−06)

u r

9.7119(−07)

1.8818(−06)

8.1105(−07)

3.0421(−06)

u θ

2.8537(−05)

4.5514(−05)

3.2188(−05)

6.3244(−05)

1/32

u

9.2898(−09)

1.8373(−08)

1.8642(−08)

3.2187(−07)

u r

7.9264(−08)

1.5078(−07)

7.0243(−08)

2.2424(−07)

u θ

1.9185(−06)

3.0633(−06)

2.3156(−06)

4.4341(−06)

1/64

u

5.8207(−10)

1.1480(−09)

1.1022(−09)

1.9068(−08)

u r

5.5941(−09)

1.0553(−08)

5.8124(−09)

1.4172(−08)

u θ

1.2425(−07)

1.9850(−07)

1.5510(−07)

2.7012(−07)