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Boundary Value Problems

Table 1 The number of iterations and condition numbers for h m / h n =2/3

From: A BDDC algorithm for the mortar-type rotated Q 1 FEM for elliptic problems with discontinuous coefficients

M × M

H/ h n =4

H/ h n =16

k = 2

k = 4

k = 6

k = 2

k = 4

k = 6

4 × 4

10 (3.30)

10 (3.30)

10 (3.30)

12 (5.15)

12 (5.15)

12 (5.15)

8 × 8

11 (3.30)

11 (3.34)

11 (3.32)

12 (5.30)

13 (5.34)

13 (5.34)

16 × 16

11 (3.24)

12 (3.21)

13 (3.21)

13 (5.32)

13 (5.39)

14 (5.39)

32 × 32

11 (3.24)

12 (3.24)

12 (3.24)

15 (5.37)

15 (5.41)

15 (5.41)

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