This paper presents a computational fluid dynamics (CFD) study of vortex-induced vibration (VIV) for different aspect ratio (L/D) cylinder. Of particular interest was to measure hydrodynamic forces and numerically investigate the wake behaviour VIV while varying ratio. The simulation models represented actual experimental conditions with idealised free-surface boundary condition capture responses from fluid-structure interaction phenomenon. simulations were performed in subcritical flow...

Currently, there is a growing demand for renewable energy harnessed from fluid dynamics within the oil and gas industry. The surge in has propelled electricity to become vital irreplaceable form of universal worldwide. Vortex-Induced Vibrations (VIV) harvesting shows great potential as technology capturing flowing bodies water. purpose this research investigate numerical aspect VIV rigid circular cylinders with intention sea. investigation employs Vibration Aquatic Clean Energy (VIVACE)...

Floating structures, such as Spar platform, are likely to experience significant motions while operation due Vortex-induced Motion (VIM). The main features of VIM include aspect ratio and mass the structure. This paper focuses on further development a previously published semi-empirical method called wake oscillator model (WOM) for VIM, which aims derive mathematical correlation in modelling all phenomenon. Analytical solution is proposed coupled WOM structure based Van der Pol equation by...

This paper investigates the corrosion factor to global strength of aging offshore jacket platforms in different marine zones. The time-dependent wastage model from Melchers, an active expert, by considering zones, i.e., atmospheric, splash, and immersion. In addition, three aged platform models originally installed were selected investigate effect on strength. platform's is calculated Reserve Strength Ratio (RSR) value. RSR obtained via nonlinear static pushover analysis always used estimate...

Overtopping Breakwater for Energy Conversion (OBREC) is a new integration design concept with multifunctional abilities.The used structure sharing cost strategy between Wave Converter (WEC) and traditional breakwater the aims of energy capture protection purposes.A prototype OBREC device was developed in Italy 2017 showed unsuitable output mild wave conditions.Thus, several studies have been conducted to increase hydraulic performance OBREC, particularly by improving their geometries.The...

Abstract Nowadays, the demand for marine renewable and clean energy from fluid flow in oil gas industry has made electricity most sought-after indispensable source of uncontrollable power worldwide. Vortex-Induced Vibrations (VIV) harvesting is a promising technology harnessing flowing water bodies. This study focuses on numerically investigating VIV rigid circular cylinders as sustainable source, utilizing Vibration Aquatic Clean Energy (VIVACE) converter to harvest ocean. Specifically,...

For offshore structures, especially jacket supported structure such as fixed platform and wind turbine, the underwater area provides an ideal site for corrosion formation marine fouling. In this environment, structures are exposed to particularly aggressive colonized by organisms involving a diversity of species. paper, number cases conducted where existing is subjected uniform corrosion. Furthermore, also The assessed investigate effects fouling on its structural strength determining...

Studies in offshore engineering have shown that vortex-induced vibration (VIV) of a slender riser can be fundamentally different from cylindrical spar structure.Under similar environments, the primary difference between two structures affecting vortex shedding relates to aspect ratio (length diameter ratio, L/D).In present investigation, careful experiments were carried out on VIV an elastically mounted cylinder with varying ratio.Experiments conducted by forcing vertical cylinders still...

Energy harvesting from Vortex-Induced Vibration (VIV) presents a promising avenue for renewable energy generation by harnessing the kinetic of fluid flows through innovative technologies. Despite increasing interest in VIV harvesting, there is need systematic evaluation existing literature to understand research trends, key contributors and emerging areas focus. A bibliometric analysis offers quantitative approach address this gap, providing valuable insights into evolution dynamics on VIV....

Drilling risers used in oil and gas operations are subjected to external loads such as wave current. One of the phenomena that arise from is Vortex-Induced Vibration (VIV), which affects performance riser due excessive vibration vortex shedding. A significant factor influencing VIV design drilling its auxiliary lines. Until now, optimum geometrical size gap between main still very scarcely studied. In this paper, objective study effects ratio (G/D) on shedding phenomenon a fixed freely...

Vortex-Induced Vibration (VIV) has emerged as a crucial problem that may arise during drilling operation, which could result in riser failure. Engineers focus on riser's flow characteristics and controls with the intention of improving environment. Auxiliary lines or control rods are usually placed around main to suppress VIV. However, issue related past system auxiliaries yet be resolved. The were analysed this research. simulations conducted using Computational Fluid Dynamics (CFD)...

Rigs-to-Reefs (R2R) is an alternative for oil and gas industry decommissioning purpose.The program will benefit marine life as artificial reef a sustainable solution to promote ecosystem growth.For any platform considered reefing, extensive study on the suitability performance of essential.These studies evaluate stability relevance structure when deployed seabed.This paper presents research dynamic response flow characteristics conceptual proposed R2R platform.The Computational Fluid...

Explorations by oil and gas companies have moved from shallow to deep water satisfy consumers' changing needs.A circular-shaped cylinder structure placed in is also known spar platform, normally floated subjected severe conditions which cause unpleasant motions fatigue damage the structure.Wake oscillator model considered a semi-empirical that most suitable for evaluation of Vortexinduced Vibrations (VIV) features during design stage.This work focuses on validation wake VIV with previously...

Abstract Reefing of Oil and Gas structure has become as one the emerging options for decommissioning an O&G Structure offshore requires expert input beyond engineering such biomarine environmental sciences. This paper will present interdisciplinary collaborative effort by industries with academia in Malaysia developing a reef viability index first high level screening to assess suitability using reefing option region. The results formulation identify area that potential be used...

Decommissioning of the offshore platform as an artificial reef, known Rigs-to-Reefs (R2R), has become a sustainable approach for oil companies. The was reused to serve underwater ecosystem reef new marine which helps tackle food security issue. This paper presents findings formulation reefing viability index recognize region that can be used R2R projects within South China Sea. combined effects spatial data, numerical modelling, and geographic system (GIS) are proposed study relationship...

Introduction . Trawling is a method of catching fish in large volume where nets are pulled through water using one or two boats. Bottom trawling the over on seabed. The gear bottom would impact exposed subsea pipeline, Subsea pipelines transport crude oil and gas from offshore platform to shore facility. This study assesses risk activities at Sabah Labuan offshore. specification trawl equipment used by local trawlers was determined on-site survey. frequency trawler crossing calculated based...

Platform decommissioning activities have been increasing due to unproductive fields and unstable oil prices. One of the methods used by gas companies is converting platform into an artificial reef through rigs-to-reef (R2R) programme. The programme benefits marine life increases productions. In this study, dynamic responses flow characteristics jacket platforms were investigated using computational fluid dynamics (CFD) analysis. Three structures with different sizes investigate suitability...

To have a better understanding of the impact PETRONAS oil and gas platform on commercial fisheries activities, Universiti Malaysia Terengganu (UMT) examined two approaches which are data collection from satellite fishermen anglers. By profiling anglers who utilize reefed structures for fishing, it can determine if design location reef platforms will benefit or negatively impacts those fisherman. Furthermore, this assessment be contributing to knowledge regarding value offshore as resources....

A phenomenological Wake Oscillator Model (WOM) is studied to capture the coupling effects between fluid and structure. The Vortex-Induced Vibration (VIV) phenomenon modelled describe motion imposed by lift forces on influence of aspect ratio parameter (L/D) was introduced into model characterize VIV for finite cylinders. proposed captured basic features such as amplitude vibration, frequency, coefficient structural equation wake equation. Predictions WOM are discussed compared with...

Abstract In Malaysia, numerous offshore oil and gas platforms are approaching the end of their operational lifespans will soon be scheduled for decommissioning. Traditional decommissioning typically involves complete removal platform from seabed, consequently resulting in destruction established marine life communities present on structure. A Rigs-to-Reefs strategy provides an alternative to obsolete, non-productive platforms, by converting into a permanent artificial reef utilizing one...

The deep-draft semisubmersible (DDSS) platform is well known due to its favourable vertical motion routine. However, DDSS platforms face a serious challenge in vortex-induced (VIM) the changing forces of column. A computational fluid dynamic (CFD) simulation using AcuSolve conducted investigate effect twisted-square column with different twisted angles, 0°, 22.5°, 45.0°, 67.5° and 90.0°, on VIM responses performance at current incidence angles 0° 45°.Platform models scale 1:70 are studied...

A laboratory experiment is conducted to investigate the behaviour of a low-mass-ratio and high aspect ratio flexible cylinder under vortex-induced vibration (VIV). with 100 mass 1.17 towed horizontally generate uniform flow profile. The range Reynolds number from 1380 13800. Vibration amplitude, in-line cross-flow frequency response, amplitude trajectory, mean tension variation hydrodynamic force coefficients are analyzed based on measurement strain gauges, load cell CCD camera. Experimental...