|Source:||David P. Young, Boeing Computer Services, Seattle, Washington|
|Discipline:||Dynamic analysis in structural engineering|
These are four complex symmetric matrices that arise in modeling acoustic scattering phenomena. The fundamental operator is the Helmholtz equation with varying k and Dirichlet boundary conditions. All four problems come from a grid with 29 by 29 interior points. Some interior points are fixed as conductors. Five and nine-point difference formulae are used depending on the value of k at points in the grid.
Standard iterative methods, even with well-chosen preconditioners, perform poorly on these problems.
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Last change in this page: Wed Sep 22 13:33:21 US/Eastern 2004 [Comments: ]