Development of a multiphysics numerical solver for modeling the behavior of clay-based engineered barriers

Numerical model of free swelling processes in compacted MX-80 bentonites

“…The same is applied to describe transport. The field equations, state functions and parameters used in the flow and transport model are described in detail by Asensio et al 42 and Navarro et al, 16,43 while its main trends are described in Appendix C. Table C.1 summarises the parameters used.…”

“…To conduct these analyses, the model synthesised by Eq. ( 8) was implemented in the calculation program described by Navarro et al 43 ,which incorporates the formulation summarised in Appendices B, C and D, developed using the implementation platform…”

A New Double-Porosity Macroscopic Model of Bentonite Free Swelling

“…The mass balance equations to obtain P L , P G and the concentrations of the different chemical species considered (state variables in addition to u) are also defined for the resolution of the coupled flow and transport problem. Many of the currently existing numerical models (see, for example, Sánchez et al, 2005Sánchez et al, , 2016Guimarães et al, 2013;Navarro et al, 2017Navarro et al, , 2019 are based on this calculation strategy. Therefore, the necessary information is available to calculate all the magnitudes involved in Eqs.…”

“…The works of authors such as Moyne and Murad (2003), Mainka et al (2014), Qiao et al (2019) andSchreyer Bennethum et al (1997) provide a robust conceptual foundation for the development of double-porosity models. The conceptual framework that defines the Barcelona Expansive Model (BExM; Alonso et al, 1999), which has been applied with satisfactory results by various authors (Sánchez et al, 2005(Sánchez et al, , 2016Guimarães et al, 2013;Navarro et al, 2017Navarro et al, , 2019 for instance), is adopted in this study.…”

A worksheet-based tool to implement reactive transport models in COMSOL Multiphysics

“…Since some of these codes are capable of working at the level of defining the coefficients of the partial differential equations (PDE), their solution is left to the work of symbolic algebra and the numerical algorithms included in the software (Farrell et al, 2013;McRae et al, 2016;Houston and Sime, 2018). This allows the end-user to model problems with many PDEs , even with important degrees of coupling between them, very quickly and efficiently as can be seen in many recent application examples (López-Vizcaíno et al, 2017;Navarro et al, 2019).…”