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Galerkin methods for linear and nonlinear elliptic stochastic partial differential equations. (English) Zbl 1088.65002

Authors’ abstract: Stationary systems modelled by elliptic partial differential equations – linear as well as nonlinear – with stochastic coefficients (random fields) are considered. The mathematical setting as a variational problem, existence theorems, and possible discretisations – in particular with respect to the stochastic part – are given and investigated with regard to stability.

Different and increasingly sophisticated computational approaches involving both Wiener’s polynomial chaos as well as the Karhunen-Loève expansion are addressed in conjunction with stochastic Galerkin procedures, and stability within the Galerkin framework is established. New and effective algorithms to compute the mean and covariance of the solution are proposed.

The similarities and differences with better known Monte Carlo methods are exhibited, as well as alternatives to integration in high-dimensional spaces. Hints are given regarding the numerical implementation and parallelisation. Numerical examples serve as illustration.

65C30Stochastic differential and integral equations
60H15Stochastic partial differential equations
35R60PDEs with randomness, stochastic PDE
60H35Computational methods for stochastic equations
35J25Second order elliptic equations, boundary value problems
35J65Nonlinear boundary value problems for linear elliptic equations
65N12Stability and convergence of numerical methods (BVP of PDE)
65C05Monte Carlo methods