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• W2150165817 abstract "By using functional integral methods we determine new evolution equations satisfied by the joint response-excitation probability density function (PDF) associated with the stochastic solution to first-order nonlinear partial differential equations (PDEs). The theory is presented for both fully nonlinear and for quasilinear scalar PDEs subject to random boundary conditions, random initial conditions or random forcing terms. Particular applications are discussed for the classical linear and nonlinear advection equations and for the advection–reaction equation. By using a Fourier–Galerkin spectral method we obtain numerical solutions of the proposed response-excitation PDF equations. These numerical solutions are compared against those obtained by using more conventional statistical approaches such as probabilistic collocation and multi-element probabilistic collocation methods. It is found that the response-excitation approach yields accurate predictions of the statistical properties of the system. In addition, it allows to directly ascertain the tails of probabilistic distributions, thus facilitating the assessment of rare events and associated risks. The computational cost of the response-excitation method is order magnitudes smaller than the one of more conventional statistical approaches if the PDE is subject to high-dimensional random boundary or initial conditions. The question of high-dimensionality for evolution equations involving multidimensional joint response-excitation PDFs is also addressed." @default.
• W2150165817 created "2016-06-24" @default.
• W2150165817 creator A5009658255 @default.
• W2150165817 creator A5028263902 @default.
• W2150165817 date "2012-08-01" @default.
• W2150165817 modified "2023-09-27" @default.
• W2150165817 title "New evolution equations for the joint response-excitation probability density function of stochastic solutions to first-order nonlinear PDEs" @default.
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• W2150165817 doi "https://doi.org/10.1016/j.jcp.2012.07.013" @default.
• W2150165817 hasPublicationYear "2012" @default.
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