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It is well known that corners require a special treatment in the 2D boundary integral equaiton. The factor

1/(2pi)appearing in the equation should be replaced by1/(2 alpha), wherealphais the corner angle (see the problem 2.6.4 in the book of Pozrikidis on the boundary integral methods for viscous flows). Here I am concerned with a 3D viscous flow problem where the geometry is composed with several planes that form sharp edges. Right now, I am excluding those nodes from the computation but I get dubious results. I wonder if the nodes at the corner need a special treatment as well. Any help will be highly appreciated. Thank you in advance.