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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)