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Assessment of acceleration modelling for fluid-filled porous media subjected to dynamic loading

Bernd Lenhof (Institutionen för tillämpad mekanik, Material- och beräkningsmekanik) ; Per Kettil (Institutionen för tillämpad mekanik, Material- och beräkningsmekanik) ; Kenneth Runesson (Institutionen för tillämpad mekanik, Material- och beräkningsmekanik) ; Nils-Erik Wiberg (Institutionen för tillämpad mekanik, Material- och beräkningsmekanik)
International Journal for Numerical and Analytical Methods in Geomechanics (0363-9061). Vol. 32 (2008), 2, p. 109-119.
[Artikel, refereegranskad vetenskaplig]

The purpose of this paper is to examine the importance of different possible simplifying approximations when performing numerical simulations of fluid-filled porous media subjected to dynamic loading. In particular, the relative importance of the various acceleration terms for both the solid and the fluid, especially the convective contribution, is assessed. The porous medium is modelled as a binary mixture of a solid phase, in the sense of a porous skeleton, and a fluid phase that represents both liquid and air in the pores. The solid particles are assumed to be intrinsically incompressible, whereas the fluid is assigned a finite intrinsic compressibility. Finite element (FE) simulations are carried out while assuming material properties and loading conditions representative for a road structure. The results show that, for the range of the material data used in the simulations, omitting the relative acceleration gives differences in the solution of the seepage velocity field, whereas omitting only the convective term does not lead to significant differences.

Nyckelord: hydro-mechanical modelling, porous media, binary phase mixture, poromechanics, relative acceleration, road modelling



Denna post skapades 2007-05-03. Senast ändrad 2015-06-12.
CPL Pubid: 41208

 

Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Material- och beräkningsmekanik (2005-2017)

Ämnesområden

Annan samhällsbyggnadsteknik
Teknisk mekanik

Chalmers infrastruktur

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On the Dynamics of Porous Media - Application to Road and Railway Structures