Please use this identifier to cite or link to this item: https://doi.org/10.1002/nag.268
Title: Fast iterative solution of large undrained soil-structure interaction problems
Authors: Phoon, K.-K. 
Chan, S.-H.
Toh, K.-C. 
Lee, F.-H. 
Keywords: Biot's consolidation
Element-by-element (EBE) iteration
Generalized Jacobi (GJ) preconditioner
Quasiminimal residual (QMR)
Undrained condition
Issue Date: Mar-2003
Source: Phoon, K.-K., Chan, S.-H., Toh, K.-C., Lee, F.-H. (2003-03). Fast iterative solution of large undrained soil-structure interaction problems. International Journal for Numerical and Analytical Methods in Geomechanics 27 (3) : 159-181. ScholarBank@NUS Repository. https://doi.org/10.1002/nag.268
Abstract: In view of rapid developments in iterative solvers, it is timely to re-examine the merits of using mixed formulation for incompressible problems. This paper presents extensive numerical studies to compare the accuracy of undrained solutions resulting from the standard displacement formulation with a penalty term and the two-field mixed formulation. The standard displacement and two-field mixed formulations are solved using both direct and iterative approaches to assess if it is cost-effective to achieve more accurate solutions. Numerical studies of a simple footing problem show that the mixed formulation is able to solve the incompressible problem 'exactly', does not create pressure and stress instabilities, and obviate the need for an ad hoc penalty number. In addition, for large-scale problems where it is not possible to perform direct solutions entirely within available random access memory, it turns out that the larger system of equations from mixed formulation also can be solved much more efficiently than the smaller system of equations arising from standard formulation by using the symmetric quasi-minimal residual (SQMR) method with the generalized Jacobi (GJ) preconditioner. Iterative solution by SQMR with GJ preconditioning also is more elegant, faster, and more accurate than the popular Uzawa method. © 2003 John Wiley and Sons, Ltd.
Source Title: International Journal for Numerical and Analytical Methods in Geomechanics
URI: http://scholarbank.nus.edu.sg/handle/10635/65585
ISSN: 03639061
DOI: 10.1002/nag.268
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