A spectral method for solving heat and moisture transfer through consolidated porous media

Suelen Gasparin, Denys Dutykh, Nathan Mendes

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

This work presents an efficient numerical method based on spectral expansions for simulation of heat and moisture diffusive transfers through multilayered porous materials. Traditionally, by using the finite-difference approach, the problem is discretized in time and space domains (method of lines) to obtain a large system of coupled ordinary differential equations (ODEs), which is computationally expensive. To avoid such a cost, this paper proposes a reduced-order method that is faster and accurate, using a much smaller system of ODEs. To demonstrate the benefits of this approach, three case studies are presented. The first one considers nonlinear heat and moisture transfer through one material layer. The second case, ie, highly nonlinear, imposes a high moisture content gradient, simulating a rain-like condition, over a two-layered domain, whereas the last one compares the numerical prediction against experimental data for validation purposes. Results show how the nonlinearities and the interface between materials are easily and naturally treated with the spectral reduced-order method. Concerning the reliability part, predictions show a good agreement with experimental results, which confirm robustness, calculation efficiency, and high accuracy of the proposed approach for predicting the coupled heat and moisture transfer through porous materials.

Original languageBritish English
Pages (from-to)1143-1170
Number of pages28
JournalInternational Journal for Numerical Methods in Engineering
Volume117
Issue number11
DOIs
StatePublished - 16 Mar 2019

Keywords

  • Chebyshev polynomials
  • heat and moisture transfer
  • numerical simulation
  • reduced-order modeling
  • spectral methods
  • Tau-Galerkin method

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