Digitale Medien
New York, NY [u.a.]
:
Wiley-Blackwell
Numerical Linear Algebra with Applications
3 (1996), S. 1-20
ISSN:
1070-5325
Schlagwort(e):
preconditioning saddle-point problems
;
eigenvalue estimation
;
mixed finite element method
;
minimum residual method
;
second-order elliptic problems
;
Engineering
;
Engineering General
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Mathematik
Notizen:
We consider saddle-point problems that typically arise from the mixed finite element discretization of second-order elliptic problems. By proper equivalent algebraic operations the considered saddle-point problem is transformed to another saddle-point problem. The resulting problem can then be efficiently preconditioned by a block-diagonal matrix or by a factored block-matrix (the blocks correspond to the velocity and pressure, respectively). Both preconditioners have a block on the main diagonal that corresponds to the bilinear form(δ is a positive parameter) and a second block that is equal to a constant times the identity operator. We derive uniform bounds for the negative and positive eigenvalues of the preconditioned operator. Then any known preconditioner for the above bilinear form can be applied. We also show some numerical experiments that illustrate the convergence properties of the proposed technique.
Zusätzliches Material:
2 Tab.
Materialart:
Digitale Medien
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