Two-phase Darcy flows and contact mechanics in deformable fractured porous media
Discontinuous pressure model applied to simulate the desaturation by suction of a Callovo-Oxfordian (COX) argilite storage rock in the fractured Excavation Damaged Zone (EDZ) with data set provided by Andra
- Porous medium initially water-saturated
- Atmospheric gas pressure and fixed gas saturation at the bottom boundary
- Axisymmetric model with a 2D triangular mesh of 28945 cells of the \(xr\) domain \((0,10)\times(5,35)\)
- Fracture network in the EDZ: 7 oblique fractures and 1 horizontal fracture
- TPFA scheme for the discrete fracture-matrix two-phase flow model coupled with \(\mathbb P_2\) FE for the mechanics
- Top figure: axisymmetric geometry, fracture network, and boundary conditions
- Middle figure: radial and orthoradial total stresses (Pa) for the discontinuous pressure model at final time
- Bottom figure: gas saturation at final time for the discontinuous (left) and continuous (right) pressure models
Gas injection in two cross-shaped fractures using the continuous pressure model
- Porous medium initially water-saturated
- Injection of gas in the fractures
- 2D triangular mesh of 230 000 cells of the domain \((0,100)\times(0,100)\)
- TPFA scheme for the discrete fracture-matrix two-phase flow model coupled with \(\mathbb P_2\) FE for the mechanics
- Figures: gas saturation and displacement fields (in m) in the x and y directions at final time
Elasto-acoustic wave propagation in 2D and 3D
Three-dimensional simulations have been carried out by open-source code SPEED, jointly developed at MOX (Laboratory of Modeling and Scientific Computing) and DICA (Department of Civil and Environmental Engineering) of Politecnico di Milano.
Simulation of the effects of an acoustic point source in 2D with a mesh of 5000 polygons of the domain \((-1,1)\times (0,1)\), with \((-1,0)\times(0,1)\) the elastic subdomain and \((0,1)\times(0,1)\) the acoustic subdomain.
Three-dimensional simulation of a seismic source in the presence of an underground spherical acoustic cavity, with a forcing peak frequency equal to 22 Hz (wavelength comparable with the sphere diameter)
Three-dimensional simulation of a seismic source in the presence of an underground acoustic cavity, with a forcing peak frequency equal to 11 Hz (wavelength larger than the sphere diameter)