Experiment and solute transport modeling in unsaturated double-porosity media
Section: PH, MA, MX, GM, SIE, SV
Location: Ho Chi Minh City, Vietnam.
Duration : 3 to 6 months
Project description: Modeling of solute transport is of great interest for civil, environmental and material engineering (concrete anti-degradation from salt ingress, soil/groundwater decontamination, for example). The difficulty of this problem resides in the heterogeneity of geo-materials. In such media, the classic models could not capture non-standard behaviours of preferential mass transport. A class of heterogeneous geo-materials can be modeled by the double-porosity medium consisting of two porous geo-materials with micro- and macro-porosity, respectively. The description of the solute transport in the unsaturated double-porosity medium can be obtained by applying the homogenization technique (multiscale method). The macroscopic models have the form of two coupled equations that show the concentrations in the macro-porosity and micro-porosity domain.
This proposition aims to investigate the non-standard behaviours of solute transport regimes which are characterized by non-dimensional numbers, in unsaturated double-porosity geo-material. The numerical simulations of the double-porosity models are carried out using a special implementation, with resolving local boundary problems to determine effective parameters for some experiment types in hydrogeology. The same problems modeled and tested at fine scale (reference solutions) are also run to compare with the ones of the double-porosity models. Finally, the results of the tracer transport experiments in heterogeneous media in the literature will be simulated numerically in order to verify the double-porosity models.
Tasks and objectives: The principal works of this internship consist of studying the bibliography; using a FEM (finite element method) commercial code to run numerical problems; and comparing breakthrough concentration curves of the models with existing experiment results. From that, we can highlight double-porosity effect in the heterogeneous media and understand macro-micro behaviours of solute transport in porous media by the asymptotic homogenization method.
Required skills: The student with having background on flow and transport in porous media is welcome. The motivation for modelling by mathematic method is needed.