Hi All,

I am working on CO2 injection problems under the National Risk Assessment Partnership (NRAP) project. There is a fracture in one of my geometry. To understand the fracture model in the OGS, I used following references. According to Reference [3], (Equations 3 to 5, Page 1013-1014) the local displacement of the fracture is related to the global relative displacement. On the other hand, fracture width is a function of the global relative displacement, and also related to the fracture mechanical stresses via tangential and normal stiffness. Then in equation 5, the change of fracture aperture with respect to time (db/dt) is demonstrated, along with the coupled permeability function is discussed.

Question: Does the fracture width change during the simulation due to the mechanical stress? I am concerned with the assumption on page 1015, and it says “assume no fracture growth”.

References:

1.Watanabe, N. (2011). Finite element method for coupled thermos-hydro-mechanical processes in discretely fractured and non-fractured porous media PhD. Thesis, Technische Universitat Dresden.

2.Watanabe, N., G. Blocher, M. Cacace, S. Held and T. Kohl, Eds. (2017). Geoenergy Modeling III Enhanced Geothermal Systems. Springer Briefs in Energy Computational Modeling of Energy Systems, Springer.

3.Watanabe, N., W. Wang, J. Taron, U. J. Görke and O. Kolditz (2012). “Lower-dimensional interface elements with local enrichment: application to coupled hydro-mechanical problems in discretely fractured porous media.” International Journal for Numerical Methods in Engineering 90(8): 1010-1034.

Thanks in advance.

Regards,

Mohammad