2353	 Fast Finite-Difference Solution of Biharmonic Problems	 Setting the Reynolds number equal to zero in a method for solving the Navier-Strokes equations numerically results in a fast numerical method for biharmonic problems. The equation is treated as a system of two second order equations and a simple smoothing process is essential for convergence. An application is made to a crack-type problem. numerical analysis partial differential equations biharmonic equation boundary value problem
