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Cfd analysis of low frequency oscillations in Newtonian and non-Newtonian fluids in a vertical pipe
(Peer reviewed; Journal article, 2019)The effect of vertically imposed, low frequency oscillations on the rheology of shear-thinning non- Newtonian fluids are studied numerically by computational fluid dynamics (CFD). Both Newtonian (water) and inelastic ... -
CFD investigation of blind-tee effects on flow mixing mechanism in subsea pipelines
(Peer reviewed; Journal article, 2022)Blind tees are widely used in subsea pipelines to enhance the mixing conditions of oil and gas products, but their structural design still relies on experience. In this paper, a series of numerical investigations have been ... -
CFD Investigation on Hydrodynamic Resistance of a Novel Subsea Shuttle Tanker
(Peer reviewed; Journal article, 2021-12)The Subsea Shuttle Tanker (SST) was proposed by Equinor as an alternative to subsea pipelines and surface tankers for the transportation of liquid carbon dioxide (CO2) from existing offshore/land facilities to marginal ... -
CFD investigation on scour beneath different configurations of piggyback pipelines under steady current flow
(Peer reviewed; Journal article, 2022)Scour beneath piggyback pipelines laid on a sandy seabed is numerically investigated by solving two-dimensional (2D) Unsteady Reynolds-averaged Navier-Stokes (URANS) equations. The fluid flow and the sediment transport are ... -
CFD investigations of scour beneath a submarine pipeline with the effect of upward seepage
(Peer reviewed; Journal article, 2020-12)A numerical model of scour beneath subsea structures considering the effect of upward seepage in the seabed is proposed. A small seepage can cause significant changes to the hydrodynamic force on the bed surface and stability ... -
CFD simulations of a suspension bridge deck for different deck shapes with railings and vortex mitigating devices
(Peer reviewed; Journal article, 2019)Aerodynamic response of a single-box suspension bridge girder is investigated using CFD simulations. The importance of including railings and vortex mitigating devices such as guide vanes and a spoiler in the simulations ... -
CFD Simulations of the Propagation of Free-Surface Waves Past Two Side-By-Side Fixed Squares with a Narrow Gap
(Peer reviewed; Journal article, 2019)Two-dimensional computational fluid dynamics (CFD) simulations are carried out to investigate the gap resonance phenomenon that occurs when free-surface waves travel past twin squares in tandem. The volume of fluid method ... -
CFD simulations of violent breaking wave impacts on a vertical wall using a two-phase compressible solver
(Peer reviewed; Journal article, 2019)Four different types of breaking wave impacts on a vertical wall are simulated using a two-dimensional two-phase Computational Fluid Dynamic (CFD) model. Air is considered as an isentropic ideal gas without solving an ... -
Chad. Realpolitik and Aspirational Deprivation
(Chapter, 2021)Chadians have experienced harsh governance and personal rule since colonization. Between independence in 1960 and the coup d’état in 1990 that brought President Déby to power, violent conflicts, and civil war continuously ... -
Challenge your Brain. Blogging during the COVID Lockdown as a Way to Enhance Well-Being and Cognitive Reserve in an Older Population
(Peer reviewed; Journal article, 2022-06)Background: The lockdown linked with COVID-19 restrictions has been reported to have severe consequences at an emotional and cognitive level, this was especially true for vulnerable populations, such as the older adults. ... -
Challenges and opportunities of marine propulsion with alternative fuels
(Peer reviewed; Journal article, 2021-06)The increasingly stringent shipping emissions regulations and global decarbonisation movement have prompted the adoption of alternative fuels in the shipping industry. This review presents the performance results and ... -
Challenges and opportunities: impacts of COVID-19 on Norwegian seafood exports
(Peer reviewed; Journal article, 2022)A rapidly growing literature shows that COVID-19 and the measures to contain the spread of the virus can have significant market impacts for seafood. These can be interruptions of production, or reductions in demand directly ... -
Challenges Associated with Creeping Disasters in Disaster Risk Science and Practice: Considering Disaster Onset Dynamics
(Peer reviewed; Journal article, 2022-01)In this article, we set out to reconcile a general conceptualization of disaster temporalities by drawing on the epitome example of a creeping disaster, namely famine. Our argument is driven by the recognition that slowly ... -
The challenges experts face during creeping crises: the curse of complacency
(Peer reviewed; Journal article, 2024)The policy literature has generally conceptualised crises as urgent public threats with clearly demarcated ‘focusing events’. Consequently, most studies have identified the main challenges faced by expert agencies involved ... -
Challenges in making school social work a reality in Brazilian schools
(Peer reviewed; Journal article, 2021-07)At the end of 2019, the presence of social workers became mandatory in Brazilian state-funded elementary schools. This brief note explores the challenges schools may have in translating the new legislation from paper to ... -
Challenges of disseminating clinical practice guidelines in a weak health system: the case of HIV and infant feeding recommendations in Tanzania
(Journal article; Peer reviewed, 2014)Background: Clinical guidelines aim to improve patient outcomes by providing recommendations on appropriate healthcare for specific clinical conditions. Scientific evidence produced over time leads to change in ... -
Challenges of teaching with challenging tasks: Teaching dilemmas arising from implementing a reform-oriented approach to primary mathematics
(Peer reviewed; Journal article, 2023)The research reported in this paper analyses teaching dilemmas experienced by four in-service teachers in the context of a reform-oriented teaching approach for primary mathematics called Developmental Education in Mathematics ... -
Challenges to the implementation of in situ simulation at HEMS bases: a qualitative study of facilitators’ expectations and strategies
(Peer reviewed; Journal article, 2021)Introduction Facilitators play an essential role in simulation-based training on helicopter emergency medical services (HEMS) bases. There is scant literature about the barriers to the implementation of simulation training ... -
Challenges with Gas Hydrate Formation
(Peer reviewed; Journal article, 2019)Many multiphase flow lines are prone to hydrate formation unless prevention methods are put in place. Chemical management of hydrate formation is traditionally done with thermodynamic hydrate inhibitors but in the last 25 ... -
Challenging an old theory – Portable X-ray fluorescence(pXRF) analyses of greenstone adzes in Rogaland, southwestern Norway
(Chapter, 2022)The first large scale regional provenance analysis of greenstone and diabase adzes in western Norway was undertaken forty years ago. The study identified two social territories, which have been central in Norwegian archaeology ...