Spline-interpolation solution of 3D Dirichlet problem for one class of   solids
  We present the spline-interpolation approximate solution of the Dirichlet problem for the Laplace equation in the bodies of revolution, cones and cylinders. Our method is based on reduction of the 3D problem to the sequence of 2D Dirichlet problems. The main advantage of the spline-interpolation solution of the 3D Dirichlet problem is its continuity in the whole domain up to the boundary even for the case of the linear spline. 
Pyotr Ivanshin, Elena Shirokova
math-ph math.CV math.MP