Calculating the Malliavin derivative of some stochastic mechanics problems

Hauseux, Paul, Hale, Jack S. and Bordas, Stephane ORCID: https://orcid.org/0000-0001-8634-7002 2017. Calculating the Malliavin derivative of some stochastic mechanics problems. PLoS ONE 12 (12) , e0189994. 10.1371/journal.pone.0189994

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Abstract

The Malliavin calculus is an extension of the classical calculus of variations from deterministic functions to stochastic processes. In this paper we aim to show in a practical and didactic way how to calculate the Malliavin derivative, the derivative of the expectation of a quantity of interest of a model with respect to its underlying stochastic parameters, for four problems found in mechanics. The non-intrusive approach uses the Malliavin Weight Sampling (MWS) method in conjunction with a standard Monte Carlo method. The models are expressed as ODEs or PDEs and discretised using the finite difference or finite element methods. Specifically, we consider stochastic extensions of; a 1D Kelvin-Voigt viscoelastic model discretised with finite differences, a 1D linear elastic bar, a hyperelastic bar undergoing buckling, and incompressible Navier-Stokes flow around a cylinder, all discretised with finite elements. A further contribution of this paper is an extension of the MWS method to the more difficult case of non-Gaussian random variables and the calculation of second-order derivatives. We provide open-source code for the numerical examples in this paper.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Additional Information:	This is an open access article distributed under the terms of the Creative Commons Attribution License
Publisher:	Public Library of Science
ISSN:	1932-6203
Date of First Compliant Deposit:	29 August 2018
Date of Acceptance:	6 December 2017
Last Modified:	03 May 2023 23:12
URI:	https://orca.cardiff.ac.uk/id/eprint/111996

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