... 0xH,0yH 388 The Boundary Element Method with Programming The Hankel functions can be expanded to4 (14.12) where 0.57721J (Euler constant) and here only the first terms of the expansion ... continuous elements and then with the program prog111_discont, the discontinuous version of the multi-region program. If we compare the tractions at interface elements in Figures 12.7, 12 .8 with ... 8 ! Nodes 4 ! Elements 1.000 1.000 0.707 0.707 1.000 0.000 0.707 -0 .707 0.000 -1 .000 1234364 The Boundary Element Method with Programming where (13.30) The discretised form...