the present study investigates the accumulation of vanadium, iron, and nickel in different depths of soil in collection sites of oil sludge, in masjed soleyman oil and gas exploitation company, located in choob sorkh region. to conduct the research, four sampling points have been selected at the mentioned site, with one sampling point chosen outside the site, as the clean area. soil sampling ha...

Abstract The acoustic propagation characteristics of axisymmetric waves have been widely used in leak detection fluid-filled pipes. related methods and equipment are gradually coming to the market, but their theoretical research obviously lags behind field practice, which seriously restricts breakthrough innovation this technology. Based on fully three-dimensional effect surrounding medium, a c...

In this paper, we introduce our work on accelerating a black oil simulator using GPU-based parallel iterative linear solvers. We develop iterative linear solvers and several commonly used preconditioners on NVIDIA Tesla GPUs. These solvers and preconditioners are coupled with our in-house reservoir simulator. Numerical experiments show that our GPU-based black oil simulator is sped up around si...

The development of mathematical models for describing the dynamic behaviours of fluid conveying pipes, micro-pipes and nanotubes under the influence of some thermo-mechanical parameters results into nonlinear equations that are very difficult to solve analytically. In cases where the exact analytical solutions are presented either in implicit or explicit forms, high skills and rigorous mathemat...

The present work investigates the effect of the elliptical three-dimensional (3D) cracks on a pipe with thickness transition, considering internal pressure. Level sets were defined using the extended finite element method (XFEM), the stress intensity factors (SIFs) of 3D cracks were investigated and compared between straight pipes and pipes with thickness transition. The results show that the X...