Fractures and fracture networks are the principal pathways for migration of water and contaminants in groundwater systems, fluids in enhanced geothermal systems (EGS), oil and gas in petroleum reservoirs, carbon dioxide leakage from geological carbon sequestration, and radioactive and toxic industrial wastes from underground storage repositories. When dealing with EGS fracture networks, there a...

In this paper a finite volume method with a “Modified Implicit Pressure, Explicit Saturation” (MIMPES) approach is used to model the 3-D incompressible and immiscible twophase flow of water and oil in heterogeneous and anisotropic porous media. A vertex centered finite volume method with an edge-based data structure is adopted to discretize both the elliptic pressure and the hyperbolic saturati...

A two-dimensional along-the-channel CFD (computational fluid dynamic) model, coupled with a twophase flow model of liquid water and gas transport for a PEM (proton exchange membrane) fuel cell is described. The model considers non-isothermal operation and thus the non-uniform temperature distribution in the cell structure. Water phase-transfer between the vapour, liquid water and dissolved phas...

The paper reports pressure drop data for hydrocarbon fluids boiling in vertical upflow in a 8.68 m long, 25.4 mm i.d. tube, heated by direct electrical heating. These data were recorded simultaneously with the boiling heat transfer measurements. The systematic trends of the measured pressure gradient with respect to vapour quality, mass flux and pressure are examined. This provides useful infor...

Wind-blown sand is a typical example of twophase particle-laden flows. Owing to lack of simultaneous measured data of the wind and wind-blown sand, interactions between them have not yet been fully understood. In this study, natural sand of 100–125 lm taken from Taklimakan Desert was tested at the freestream wind speed of 8.3 m/s in an atmospheric boundary layer wind tunnel. The captured flow i...

We present in this note a unified approach on how to design simple, efficient and energy stable time discretization schemes for the Allen-Cahn or Cahn-Hilliard Navier-Stokes system which models twophase incompressible flows with matching or non-matching density. Special emphasis is placed on designing schemes which only require solving linear systems at each time step while satisfy discrete ene...

Distributed database management protocols are usually based on the assumption that data consistency is paramount. However, this assumption is invalid for distributed real-time applications such as ship combat systems and air traffic control, where data availability is crucial and may need to be achieved at the expense of guarantees of data consistency. Two protocols designed for real-time comba...

We consider in this paper numerical approximations of phase-field models for twophase complex fluids. We first reformulate the phase-field models derived from an energetic variational formulation into a form which is suitable for numerical approximation and establish their energy laws. Then, we construct two classes, stabilized and convex-splitting, of decoupled time discretization schemes for ...

Concurrency on a massive scale is required to meet the needs of today’s increasingly distributed systems. To better understand how current concurrency control schemes work on distributed systems, this paper reports an evaluation of concurrency control schemes for online transaction processing (OLTP) workloads on distributed database management systems (DBMS) with a variable number of nodes. Fiv...

We have developed T2Well, a numerical simulator for nonisothermal, multiphase, multicomponent flows in integrated wellbore-reservoir systems. The new model extends the existing numerical reservoir simulator TOUGH2 to calculate the flow in both the wellbore and the reservoir simultaneously and efficiently, by introducing a special wellbore subdomain into the numerical grid. For gridblocks in the...