A poro-viscoelastic substitute model of fine-scale poroelasticity obtained from homogenization and numerical model reduction
Artikel i vetenskaplig tidskrift, 2020

Numerical model reduction is exploited for computational homogenization of the model problem of a poroelastic medium under transient conditions. It is assumed that the displacement and pore pressure fields possess macro-scale and sub-scale (fluctuation) parts. A linearly independent reduced basis is constructed for the sub-scale pressure field using POD. The corresponding reduced basis for the displacement field is constructed in the spirit of the NTFA strategy. Evolution equations that define an apparent poro-viscoelastic macro-scale model are obtained from the continuity equation pertinent to the RVE. The present model represents an extension of models available in literature in the sense that the pressure gradient is allowed to have a non-zero macro-scale component in the nested FE2 setting. The numerical results show excellent agreement between the results from numerical model reduction and direct numerical simulation. It was also shown that even 3D RVEs give tractable solution times for full-fledged FE2 computations.

Poroelasticity

Computational homogenization

Numerical model reduction

Författare

Ralf Jänicke

Chalmers, Industri- och materialvetenskap, Material- och beräkningsmekanik

Fredrik Larsson

Chalmers, Industri- och materialvetenskap, Material- och beräkningsmekanik

Kenneth Runesson

Chalmers, Industri- och materialvetenskap, Material- och beräkningsmekanik

Computational Mechanics

0178-7675 (ISSN) 1432-0924 (eISSN)

Vol. in press 1-21

Modellering och beräkningsbaserad homogenisering av ett poröst medium med vätsketransport i ett nätverk av propagerande sprickor

Vetenskapsrådet (VR), 2018-01-01 -- 2022-12-31.

Ämneskategorier

Teknisk mekanik

Beräkningsmatematik

Sannolikhetsteori och statistik

DOI

10.1007/s00466-019-01808-x

Mer information

Senast uppdaterat

2020-02-12