Abstract
We propose a numerical model of liquid-saturated porous material, based on a coupled approach combining a discrete elements method and finite difference method. An ensemble of discrete elements simulates processes of deformation of a porous solid and filtration of single-phase liquid in an interconnected network of "micropores". Mass transfer of a fluid between the "micropores" and "macropores" (the latter are considered as the areas between spatially separated and non-interacting discrete elements) is calculated on a finer grid superimposed on an ensemble of movable discrete elements. The developed model was applied to study a mechanical response of brittle samples with water-saturated pore volume. It has been shown that the strength of liquid-saturated samples is determined not only by strength properties of "dry" material and a pore pressure, but largely by sample geometry, deformation rate and characteristics of porosity of a material. We suggest a generalizing dependence of the uniaxial compressive strength of water-saturated permeable brittle material on the specific diameter of filtration channels, which is the ratio of the characteristic diameter of the filtration channels to the square root of the strain rate. Values of parameters of mentioned dependence are strongly connected with the character of the relation between pore volume and pressure of a liquid.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 4th International Conference on Particle-Based Methods - Fundamentals and Applications, PARTICLES 2015 |
| Publisher | International Center for Numerical Methods in Engineering |
| Pages | 442-450 |
| Number of pages | 9 |
| ISBN (Print) | 9788494424472 |
| Publication status | Published - 2015 |
| Event | 4th International Conference on Particle-Based Methods, PARTICLES 2015 - Barcelona, Spain Duration: 28 Sep 2015 → 30 Sep 2015 |
Other
| Other | 4th International Conference on Particle-Based Methods, PARTICLES 2015 |
|---|---|
| Country | Spain |
| City | Barcelona |
| Period | 28.9.15 → 30.9.15 |
Fingerprint
Keywords
- Discrete elements
- Finite difference
- Liquid
- Porous media
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
Cite this
A theoretical investigation of a mechanical response of fluid-saturated porous materials based on a coupled discrete-continuum approach. / Dimaki, Andrey V.; Shilko, Evgeny V.; Astafurov, Sergei V.; Psakhie, Sergei G.
Proceedings of the 4th International Conference on Particle-Based Methods - Fundamentals and Applications, PARTICLES 2015. International Center for Numerical Methods in Engineering, 2015. p. 442-450.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - A theoretical investigation of a mechanical response of fluid-saturated porous materials based on a coupled discrete-continuum approach
AU - Dimaki, Andrey V.
AU - Shilko, Evgeny V.
AU - Astafurov, Sergei V.
AU - Psakhie, Sergei G.
PY - 2015
Y1 - 2015
N2 - We propose a numerical model of liquid-saturated porous material, based on a coupled approach combining a discrete elements method and finite difference method. An ensemble of discrete elements simulates processes of deformation of a porous solid and filtration of single-phase liquid in an interconnected network of "micropores". Mass transfer of a fluid between the "micropores" and "macropores" (the latter are considered as the areas between spatially separated and non-interacting discrete elements) is calculated on a finer grid superimposed on an ensemble of movable discrete elements. The developed model was applied to study a mechanical response of brittle samples with water-saturated pore volume. It has been shown that the strength of liquid-saturated samples is determined not only by strength properties of "dry" material and a pore pressure, but largely by sample geometry, deformation rate and characteristics of porosity of a material. We suggest a generalizing dependence of the uniaxial compressive strength of water-saturated permeable brittle material on the specific diameter of filtration channels, which is the ratio of the characteristic diameter of the filtration channels to the square root of the strain rate. Values of parameters of mentioned dependence are strongly connected with the character of the relation between pore volume and pressure of a liquid.
AB - We propose a numerical model of liquid-saturated porous material, based on a coupled approach combining a discrete elements method and finite difference method. An ensemble of discrete elements simulates processes of deformation of a porous solid and filtration of single-phase liquid in an interconnected network of "micropores". Mass transfer of a fluid between the "micropores" and "macropores" (the latter are considered as the areas between spatially separated and non-interacting discrete elements) is calculated on a finer grid superimposed on an ensemble of movable discrete elements. The developed model was applied to study a mechanical response of brittle samples with water-saturated pore volume. It has been shown that the strength of liquid-saturated samples is determined not only by strength properties of "dry" material and a pore pressure, but largely by sample geometry, deformation rate and characteristics of porosity of a material. We suggest a generalizing dependence of the uniaxial compressive strength of water-saturated permeable brittle material on the specific diameter of filtration channels, which is the ratio of the characteristic diameter of the filtration channels to the square root of the strain rate. Values of parameters of mentioned dependence are strongly connected with the character of the relation between pore volume and pressure of a liquid.
KW - Discrete elements
KW - Finite difference
KW - Liquid
KW - Porous media
UR - http://www.scopus.com/inward/record.url?scp=84960350080&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84960350080&partnerID=8YFLogxK
M3 - Conference contribution
SN - 9788494424472
SP - 442
EP - 450
BT - Proceedings of the 4th International Conference on Particle-Based Methods - Fundamentals and Applications, PARTICLES 2015
PB - International Center for Numerical Methods in Engineering
ER -