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Discretising the regularised integral equation (3.119) with
piecewise constant shape functions, one obtains



(3.133) 
where S_{J} is a plane element in S_{y} and
represents on S_{J}. In (3.134) the righthand screw convention is applied
to the direction of the integration along
.
In the evaluation
of the integral in (3.134) we divide (3.117) into the
static part (the fundamental solution of threedimensional Laplace's
equation) and the residual part as follows:
When kR is small we use the following series for the computation of
We compute the integrals related to the static part
analytically and the rest numerically with Gaussian quadrature.
Kenichi Yoshida
20010728