A multigrid multilevel Monte Carlo method for transport in the Darcy–Stokes system

Prashant Kumar, Peiyao Luo, Francisco J. Gaspar, Cornelis W. Oosterlee

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)
2 Downloads (Pure)

Abstract

A multilevel Monte Carlo (MLMC) method for Uncertainty Quantification (UQ) of advection-dominated contaminant transport in a coupled Darcy–Stokes flow system is described. In particular, we focus on high-dimensional epistemic uncertainty due to an unknown permeability field in the Darcy domain that is modelled as a lognormal random field. This paper explores different numerical strategies for the subproblems and suggests an optimal combination for the MLMC estimator. We propose a specific monolithic multigrid algorithm to efficiently solve the steady-state Darcy–Stokes flow with a highly heterogeneous diffusion coefficient. Furthermore, we describe an Alternating Direction Implicit (ADI) based time-stepping for the flux-limited quadratic upwinding discretization for the transport problem. Numerical experiments illustrating the multigrid convergence and cost of the MLMC estimator with respect to the smoothness of permeability field are presented.

Original languageEnglish
Pages (from-to)382-408
Number of pages27
JournalJournal of Computational Physics
Volume371
DOIs
Publication statusPublished - 15 Oct 2018

Keywords

  • Contaminant transport
  • Darcy–Stokes flow
  • MLMC
  • Multigrid
  • UQ
  • Uzawa smoother

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