Block Diagonal Preconditioners for the Galerkin Least Squares Method in Linear Elasticity
Commun. Korean Math. Soc. 2000 Vol. 15, No. 1, 143-153
Jaechil Yoo
Dongeui University
Abstract : In \cite{franca}, Franca and Stenberg developed several Galerkin least squares methods for the solution of the problem of linear elasticity. That work concerned itself only with the error estimates of the method. It did not address the related problem of finding effective methods for the solution of the associated linear systems. In this work, we propose the block diagonal preconditioners. The preconditioned conjugate residual method is robust in that the convergence is uniform as the parameter, $\nu$, goes to $\frac{1}{2}.$ Computational experiments are included.
Keywords : the Galerkin least squares method, preconditioned conjugate residual method, linear elasticity, multigrid
MSC numbers : 65F10, 65N30, 65N55
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