This paper considers the application of numerical techniques to modelling large 3D Extremely Low Frequency (ELF) electromagnetic problems in the time and frequency domains. The environment model consists of three material layers: air, sea and seabed. To represent a coastal region, the sea region is shallow with a variable depth and includes a sloping seabed. The electromagnetic source is a harm...

Although twin pipelines in series have been used to transport hydrocarbons engineering practice, most previous studies focused on the dynamic response of seabed around a single pipeline. A two-way coupling model fluid–structure–seabed interaction (FSSI) is proposed for study soil and liquefaction caused by waves currents pipelines. The present integrates flow introducing boundary condition velo...

research interests have been focused on the concept of penalizing jobs both for being early and for being tardy because not only of modern competitive industrial challenges of providing a variety of products at a very low cost by smoothing productions but also of its increasing and exciting computer applications. here, sequencing approaches of the mixed- model just-in-time production systems is...

the data set employed in this study was comprised of a number of 6,800 records of lamb’s longevity and their survival rate, collected from 1989 through 2009, from the lori-bakhtiari experimental flock at the shooli station in shahrekord, iran. the data were analyzed using linear models and proportional hazard models with weibull function. these models included fixed factors and direct additive ...

The seabed instability induced by the transient liquefaction when exposed to wave-current may threaten safety of offshore structures. In this study, Reynolds-averaged Navier–Stokes (RANS) equations with k–ε turbulence model were used imitate fluid dynamics, and Biot's poro-elastic theory was simulate response. An in-house solver (porous-fluid–seabed–structure interactions–field operation manipu...

This paper presents a numerical study on the hydrodynamic coefficients of DARPA SUBOFF hull when deeply submerged and near seabed. The CFD-based model was validated with experimental data, namely experiments involving BB2 undergoing straight-ahead motion free surface only at drift angles without influence either or used to investigate effects seabed's effect behaviour across range speeds, angle...

Our main goal is to assess the hydrodynamics of turbidity currents and mudflows and their ability to produce morphological features such as ripples, dunes, antidunes and gullies along their paths. Of particular interest is to elucidate the role played by turbidity currents on the inception of submarine channels and canyons. To this end, understanding the mechanics of sediment erosion, including...

Evaluating the importance of natural marine hydrocarbon seeps to global methane budgets requires correctly predicting the gas fraction lost by the seep bubbles during transit through the water column. In the Santa Barbara Channel, California, three widely differing seeps (depth, flux, oiliness) were visited and observations were made of seep gas partial pressures, Pi, near the surface for alkan...