Presentation materials
Large scale flow and dispersion in heterogeneous networks under non-linear flow conditions
Non-linear flow and dispersion in natural and engineered media are key issues in different fields of science and engineering. Applications range across scales from non-Newtonian flows in pore and capillary networks to turbulent flows in karst networks. Spatial variability in the physical medium...
We will present our latest observations on tortuosity in pore scale porous media model under high Reynolds numbers (Re) during the transition from the Darcy to the non-Darcy, inertial regime [1]. Unexpectedly, we found that tortuosity does not follow a natural monotonous decrease with increasing flux. We will provide an overview of the method and algorithms employed. Then, we will discuss how...
Tortuosity is one of the fundamental effective parameters describing hydrodynamic properties of porous media. However, the fact it can be defined in several different ways, e.g. via the length of the streamlines [1] or as a statistic of the pore-scale velocity field [2], may cause inconsistency between the results. For example, the equivalence between the weighted streamline-based tortuosity...
The upscaling of flows with nonlinear rheology is challenging because conventional homogenization methods usually rely on linearity to obtain closed form solutions. Here, the problem of upscaling power-law fluid flows in tree-like networks is examined. An analytical scheme is presented for direct microscale solutions to the problem. Homogenization of the problem is explored through the...
In civil engineering, it is common practise to support the walls of an open excavation, such as a borehole or trench, by filling it with fluid. The traditional and most widely used support fluids are slurries of bentonite clay in water. Semidilute aqueous solutions of high-molecular-weight polymer ("polymer fluids") are known have a variety of advantages over traditional bentonite slurries in...
Keywords and scope: mass transport in living systems, coupling of non-linear models, heterogeneous rheology, therapy monitoring, biological porous media, Stokes flow in moving geometries.
In this presentation we are interested in operational applications and new numerical approaches for modeling the heterogeneous mucus biofilm of human lungs for the monitoring of cystic fibrosis (CF)...
Polymer flooding plays a key role in enhancing oil recovery process around worldwide oil fields. Viscoelastic polymer added into water can improve sweep efficiency either by reducing mobility ratio or by lowering the degree of heterogeneity of layers [1]. It may result from factors such as the decreasing size or clogging of pore throat due to polymer retention within the reservoir rock, the...
