Vortex-induced vibration (VIV) can be inevitably encountered in deep ocean mining. As the internal flow is transported axially flexible riser, complicated VIV dynamics occurs undergoing both and external flows. Therefore, object here to explore effect of with different velocities densities on response under various uniform current. In this study, a semi-empirical time domain prediction method f...

The increasing energy demand has led to more explorations in the oil and gas industry. To achieve this, marine risers pipelines are used convey fluid other resources meet demand. In recent years, hybrid flexible composite have become adaptable. Flexible already proven be a popular riser solution for various floating production systems shallow deepwater many parts of world due their good dynamic...

Effects of insertion of coiled wire in juxtaposition with twisted tapes on heat transfer rate and solar radiation without disturbing the flow inside the riser tubes in a solar flat plate collector is experimentally reconnoitered in this present work. The wire coil used as a turbulator is placed inside the riser tube while the twisted tape is inserted into the wire coil to create a continuous sw...

This paper develops theory behind the noise power ratio (NPR) testing of ADCs. A mid-riser formulation is used for mathematical simplicity. Simulated results, using DAC generated signals, suggests that the uniformly distributed signal is easier to implement and is more sensitive to amplitude dependent distortions.

Primary repair of pectoralis major tendon with bony tunnels and anchor sutures in the proximal humerus creates a potential weakness and stress riser leading to increased risk of periprosthetic fracture and nerve damage at the site of weakness with subsequent injury, if not allowed to heal satisfactorily with adequate period of rest.

Probabilistic sensitivity analysis identifies the influential uncertain input to guide decision-making. We propose a general framework with respect distribution parameters that unifies wide range of measures, including information theoretical metrics such as Fisher information. The is derived analytically via constrained maximisation and reformulated into an eigenvalue problem. There are only t...

Original SPE manuscript received for review 24 July 2008. Revised manuscript received for review 11 May 2009. Paper (SPE 120040) peer approved 23 May 2009. Summary This is the second of two papers describing control experiments on a medium-scale slug rig. The first paper (Sivertsen et al. 2009) describes experiments performed on a small-scale laboratory rig built at the Norwegian University of ...

The vortex-induced vibration (VIV) of flexible risers is a complex fluid–structure interaction (FSI) phenomenon. In this study, we conducted numerical simulation method based on the slicing to study deep-sea with different slenderness ratios and uniform flow velocities. combines finite element model riser structure two-dimensional field slices solved by Fluent solver. was realized self-compiled...