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Book Vortex Induced Vibration of a Marine Riser

Download or read book Vortex Induced Vibration of a Marine Riser written by Xiangxi Han and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Marine riser is a key equipment connecting a floating platform and a seabed wellhead. Vortex-induced vibration (VIV) is the main cause of the fatigue damage of the riser. The prediction of marine riser VIV is very difficult because of its strong non-linearity, instability and uncertainty. In recent years, many numerical models of VIV of marine riser have been developed to explore the mechanism of marine riser VIV, providing scientific theoretical basis and practical engineering methods for vibration control and engineering design of marine riser. Combined with the authors,Äô own recent research, this chapter discusses the research progress on marine riser VIV in the ocean engineering, including phenomenon mechanism analysis and different numerical research methods.

Book Time domain Simulation of Vortex induced Vibration for Deepwater Marine Risers

Download or read book Time domain Simulation of Vortex induced Vibration for Deepwater Marine Risers written by Peter Ma and published by . This book was released on 2012 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Numerical Prediction of the Vortex induced Vibrations of Marine Riser

Download or read book Numerical Prediction of the Vortex induced Vibrations of Marine Riser written by and published by . This book was released on 2003 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Vortex induced Vibration of Two Cylinders with Different Diameters in Close Proximity

Download or read book Vortex induced Vibration of Two Cylinders with Different Diameters in Close Proximity written by Mehran Rahmanian and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: [Truncated abstract] This thesis presents an investigation of vortex-induced vibrations (VIV) and vortex shedding of two circular cylinders with different diameters in a close proximity. The effect of the proximity of cylinders on their vortex regimes and induced vibrations is discussed. The cylinders are coupled to each other either mechanically or hydrodynamically. These two types of coupling are often found in subsea piggyback pipeline and umbilical systems. The possibility of collision of the cylinders when they are free to oscillate in proximity of each other is also investigated. Wide lock-in ranges and high vibration amplitudes outside their lock-in ranges are the direct results of their hydrodynamic coupling.

Book Learning Hydrodynamic Coefficient Databases for Vortex Induced Vibration Prediction of Marine Risers Using Sparse Sensor Measurements

Download or read book Learning Hydrodynamic Coefficient Databases for Vortex Induced Vibration Prediction of Marine Risers Using Sparse Sensor Measurements written by Andreas P. Mentzelopoulos and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semi-empirical models are currently the state-of-the-art technology for flexible cylinder vortex induced vibrations (VIV) predictive modelling. Accurate prediction of the structural response relies heavily on the accuracy of the acquired hydrodynamic coefficient database. Due to the large number of inputs required, the construction of systematic hydrodynamic coefficient databases from rigid cylinder forced vibration experiments can be time-consuming or even intractable. An alternative approach has been implemented in this work to improve the flexible cylinder VIV prediction by machine-learning optimal parametric hydrodynamic databases using physical measurements along the structure. The methodology is applied to a straight riser in uniform flow and extended to non-straight riser configurations and non-uniform incoming flow profiles. Moreover, database inference is extended to using direct sparse sensor measurements along the structure. Specifically, a 19-dimensional parametric hydrodynamic coefficient database is obtained for: (i) straight riser in uniform flow (using either displacement or strain data) (ii) straight riser in stepped uniform flow (iii) straight riser in sheared flow (iv) catenary riser in uniform flow of various incidence directions between the catenary plane and the incoming flow stream (v) stepped (2-diameter) riser in uniform flow. The predicted amplitude and frequency responses, using the extracted databases, are compared with observed experimental results.

Book Experimental Investigation of Vortex induced Vibration of a Circular Cylinder

Download or read book Experimental Investigation of Vortex induced Vibration of a Circular Cylinder written by Asif Khalak and published by . This book was released on 1996 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Effects of Vortex induced Oscillations on Offshore Risers

Download or read book Effects of Vortex induced Oscillations on Offshore Risers written by Lee Ka Ho and published by . This book was released on 2001 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Subsea Pipelines and Risers

Download or read book Subsea Pipelines and Risers written by Yong Bai and published by Elsevier. This book was released on 2005-12-05 with total page 841 pages. Available in PDF, EPUB and Kindle. Book excerpt: • Updated edition of a best-selling title • Author brings 25 years experience to the work • Addresses the key issues of economy and environment Marine pipelines for the transportation of oil and gas have become a safe and reliable way to exploit the valuable resources below the world’s seas and oceans. The design of these pipelines is a relatively new technology and continues to evolve in its quest to reduce costs and minimise the effect on the environment. With over 25years experience, Professor Yong Bai has been able to assimilate the essence of the applied mechanics aspects of offshore pipeline system design in a form of value to students and designers alike. It represents an excellent source of up to date practices and knowledge to help equip those who wish to be part of the exciting future of this industry.

Book Investigating Phenomena in Vortex induced Vibration of a Cylinder Using Controlled Vibration

Download or read book Investigating Phenomena in Vortex induced Vibration of a Cylinder Using Controlled Vibration written by Timothy Lester Morse and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, we use controlled vibration, where we oscillate a rigid cylinder with a prescribed motion, in a fluid flow, in order to provide insight into aspects of vortex-induced vibration. We make extensive measurements of the fluid forces on a cylinder that oscillates sinusoidally, transverse to a free stream, at both Re = 4,000 and Re = 12,000, and generate high resolution contour plots of various fluid forcing quantities in the plane of normalized amplitude and wavelength. With such resolution, we are able to discover discontinuities in the force and phase contours, which enable us to clearly identify boundaries separating different fluid forcing regimes. These boundaries appear remarkably similar to boundaries separating different vortex formation modes in the Williamson & Roshko (1988) map of regimes. Wake vorticity measurements (using DPIV) exhibit the 2S, 2P, and P+S modes, as well as a regime where the vortex formation is not synchronized with the cylinder oscillation. A further new discovery is the existence of a region where two vortex formation regimes overlap. Associated with this overlap region, we identify a distinct mode of vortex formation where two pairs of vortices are shed per cycle of oscillation (similar to the 2P mode) but the secondary vortex is much weaker, which we have termed '2POVERLAP ', or simply the '2PO ' mode. This '2PO ' mode is of particular importance, as it is responsible for generating the peak resonant response of the body. By examining the energy transfer from fluid to body motion we predict the response of an elastically mounted cylinder that agrees remarkably well with measured free vibration responses. We introduce the concept of an "energy portrait", which allows us to identify stable and unstable amplitude response solutions and thus to predict clearly the hysteretic and intermittent switching mode transitions, both of which correspond with such phenomena measured from free vibration. In addition to predicting steady state (sinusoidal) behavior, we develop a quasi-steady model which allows us to predict the dynamics of a freely oscillating cylinder having transient or unsteady behavior. Using this model, we find a regime of normalized flow velocity where steady state vortex-induced vibrations cannot occur, and the cylinder can only oscillate with unsteady motion. Further studies include the effect of Reynolds number on the critical mass for an oscillating body, below which a structure will vibrate up to infinite normalized velocity. Finally, we measure the effect of spanwise end conditions on a free vibration response.

Book Petroleum Abstracts

Download or read book Petroleum Abstracts written by and published by . This book was released on 1996 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book International Journal of Offshore and Polar Engineering

Download or read book International Journal of Offshore and Polar Engineering written by and published by . This book was released on 1995 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt: