Null Space Algorithm and Spanning Trees in Solving Darcy's Equation |
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Authors: | Mario Arioli Gianmarco Manzini |
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Abstract: | A Null Space algorithm is considered to solve the augmented system produced by the mixed finite element approximation of Darcy's Law. The method is based on the combination of a LU factorization technique for sparse matrices with an iterative Krylov solver. The computational efficiency of the method relies on the use of spanning trees to compute the LU factorization without fill-in and on a suitable stopping criterion for the iterative solver. We experimentally investigate its performance on a realistic set of selected application problems.This revised version was published online in October 2005 with corrections to the Cover Date. |
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Keywords: | augmented systems sparse matrices mixed finite elements |
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