... been demonstrated for uniform straight (flexible) risers in uniform flow using displacement data. This work extends the framework and applies it to the straight riser problem using only limited strain measurements. The predicted amplitude and frequency responses are compared with experimental results...

... lines on the up-wave side and close to the broken position would exhibit profoundly increasing tension range. The riser tension is less affected by mooring failure due to its vertical configuration and low tension level compared to mooring tension. INTRODUCTION A typical floating offshore system...

... wake velocity deficit velocity wake velocity distribution approximation method wake model cylinder velocity distribution riser numerical data upstream oil & gas reynolds number huse model blevin model goldstein schlichting diameter circular cylinder reichardt wake field...

... ABSTRACT A computational fluid dynamics (CFD) model is built to analyze the Vortex-Induced Vibration (VIV) Suppression of a flexible riser attaching with symmetric strips suffering to the uniform current. The thick strip model and the Navier-Stokes method are applied to solve the flow field...

... ABSTRACT In this work, a series of tests was conducted in a recirculating water flume to investigate the dynamic behavior of a flexible catenary riser under the combination of internal liquid flow and external shear current. A non-intrusive high-speed imaging technique was employed to record...

... ABSTRACT Aiming at the VIM of traditional TLP and the VIV of tension leg and riser, the VIM of full depth mooring TLP is studied by combining numerical simulation with basin model test. According to the main scale parameters of TLP, the basin test model is made according to geometric...

... ABSTRACT As the oil and gas industry turns to the deep sea, flexible risers are becoming more and more widely used. To effectively achieve the lightweight and high strength requirements of ultra deep-water oil and gas development, it is a new trend to replace steel with CFRP. For deep-water...

... ABSTRACT Strong shear flows can be induced by the internal solitary wave (ISW), which plays a considerable role in the dynamic responses of steel catenary risers (SCRs). A three-dimensional program of SCRs is established using the slender rod theory. ISW effects are simulated by the extended...

... for this project. The Riser Pull-in Systems (RPSs) were used for the transferring and pulling of all six SCRs. Based on the riser's locations and installation loads, two RPSs on both sides of the SEMI were installed. One RPS is located on the north side of the SEMI, with an 800-ton chain jack used as the main...

... ABSTRACT During hang-off or transit operation, the monitoring systems is an important measure to keep the integrity and safety for drilling riser. The risers’ dynamic response prediction based on measured acceleration date from limited acceleration loggers is a technology challenge...

... ABSTRACT We experimentally investigated the flow characteristics of severe slugging (SS) in a flexible catenary riser and the excited vibration response. The severe slugging possesses three stages in one cycle namely: slug formation (SF), slug production (SP) and fast liquid production stages...

... developed. The moorings of the early permanent systems were connected to a floating body; which was in turn connected to the hull of the FPU. These moorings systems were either tubular steel structures fixed to a foundation via an articulation; or chain mooring legs used in conjunction with flexible risers...

... Abstract In the current paper, a high-fidelity model of a riser is proposed based on the absolute nodal coordinate formulation (ANCF) method in the arbitrary Lagrangian-Eulerian description (ALE). Unlike other investigations, slug flow here is assumed as a one-dimensional medium – a parcel...

... Abstract An efficient methodology for estimating the extreme response of risers, e.g. Steel Catenary Risers (SCR) or Steel Lazy Wave Risers (SLWR), connected to deep water floaters with large hang-off motions is presented. The conventional approach is to estimate the appropriate level of long...

... Abstract Drilling systems have become an integral part of oil and gas exploration and production particularly in ultra-deep waters. With increasing drilling depth, heavy weight of the riser system and high-top tension requirement become the potential concern. The study mainly focusses...

... Abstract The parametric resonance, which could induce severe consequence like fatigue, and further lead to oil-spill risk, has been vastly discussed in about the offshore pipelines. In this paper, a top-tensioned riser has been modelled, and the parametric instability of such structure has...

... Abstract The deepwater drilling riser is an important structure which is used for connecting the offshore drilling platform and the subsea wellhead. During service, the riser is subjected to severe loads which will result in complex mechanical behavior. However, the marine environment...

... and Riser Systems for Deep and Ultra-deep Water for East Coast of India Ove T. Gudmestad Department of Mechanical and Structural Engineering and Materials Science, University of Stavanger Stavanger, Norway Daniel N. Karunakaran Department of Mechanical and Structural Engineering and Materials Science...

... for simulating the inline-crossflow coupling vibration of a drilling riser system considering fluid-structure interaction Chaowei Li Research Institute Ltd., China National Offshore Oil Corporation Chaoyang District, Beijing, China ABSTRACT and the top is a dry wellhead and surface BOP sitting at the wellhead...

...-Induced Vibrations of a Slender Flexible Riser under Platform Motions Hao Hu1, Di Deng1, Decheng Wan1*, Changhong Hu2 1 Computational Marine Hydrodynamics Lab (CMHL), School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai, China 2 Research Institute for Applied...