A comparison of variational formats for porous media subjected to dynamic loading
Artikel i vetenskaplig tidskrift, 2011

This paper presents a comparison of two variational formats for fully saturated porous media subjected to dynamic loading, whereby the general situation of relative fluid acceleration is considered: (1) the classical three-field (u, p, w)-format and (2) a novel two-field (u, p)-format, where the seepage velocity w is a spatially 'local' field whose treatment resembles that of internal variables in material models. The limited numerical comparison shows that the (u, p)-format competes well with the (u, p, w)-format. Indeed, it is consistent with the general acceleration modeling in the full range of permeabilities. Moreover, in the low permeability regime (where the magnitude of w is insignificant), the new format reflects the situation pertinent to 'added-mass' and is more efficient than the classical (u, p, w)-format. Finally, the (u, p)-format can conveniently be implemented in existing FE-codes based on the 'added mass' formulation.

two-field variational format

porous media

hydro-mechanical modeling

poromechanics

models

mixtures

algorithmic state variable

wave-propagation

binary phase mixture

galerkin method

Författare

Bernd Lenhof

Chalmers, Tillämpad mekanik, Material- och beräkningsmekanik

Fredrik Larsson

Chalmers, Tillämpad mekanik, Material- och beräkningsmekanik

Kenneth Runesson

Chalmers, Tillämpad mekanik, Material- och beräkningsmekanik

International Journal for Numerical and Analytical Methods in Geomechanics

0363-9061 (ISSN)

Vol. 35 7 807-823

Ämneskategorier

Maskinteknik

DOI

10.1002/nag.925