Discontinuities in effective permeability due to fracture percolation

Radio Scintillation Due to Discontinuities in the Interstellar Plasma Density

We develop the theory of interstellar scintillation as caused by an irregular plasma having a power-law spatial density spectrum with a spectral exponent of β = 4 corresponding to a medium with abrupt changes in its density. An “outer scale” is included in the model representing the typical scale over which the density of the medium remains uniform. Such a spectrum could be used to model plasma...

Simulation and Experimental Investigation of the Permeability Reduction due to Asphaltene Deposition in Porous Media

Fracture Permeability Alteration due to Chemical and Mechanical Processes: A Coupled High-Resolution Model

Reactive fluid-flow experiments in fractures subjected to normal stress suggest the potential for either increased or decreased permeability resulting from fracture-surface dissolution. We present a computational model that couples mechanical deformation and chemical alteration of fractures subjected to constant normal stress and reactive fluid flow. The model explicitly represents micro-scale ...

Virtual Pervious Concrete: Microstructure, Percolation, and Permeability

As the usage of pervious concrete continues to increase dramatically, a better understanding of the linkages between microstructure, transport properties, and durability will assist suppliers in mixture proportioning and design. This paper presents various virtual pervious concrete microstructural models and compares their percolation characteristics and computed transport properties to those o...

Multi-scale approach to invasion percolation of rock fracture networks

A multi-scale scheme for the invasion percolation of rock fracture networks with heterogeneous fracture aperture fields is proposed. Inside fractures, fluid transport is calculated on the finest scale and found to be localized in channels as a consequence of the aperture field. The channel network is characterized and reduced to a vectorized artificial channel network (ACN). Different realizati...