... of constant current profile instead the sheared profile observed in the field, the use of linear springs to represent the nonlinear mooring stiffness in the field and the missing mooring and riser damping in the test. Koop et. al. (2016) further confirmed that the damping induced by the mooring...

.... From the analysis of long-term current profile observations and drifter data we found that, on average, near-inertial oscillations have higher amplitudes outside of the areas of strong low-frequency currents associated with a Loop Current Eddy (LCE). Within the upper 200m of the water column, periods...

... information on the current speed and orientation at various depths on an hourly basis. The data was assessed and presented in the form of hourly depth and direction current profiles. The data came from several Acoustic Doppler Current Profilers (ADCPs), upward and downward looking, drop buoys, and other field...

... to raise alarms in the field by comparing motions measured in the field using one or more motion sensors. The determination of such alarm limits is challenging as VIV is a highly nonlinear process, and small changes in the speed or shape of current profile can result in quite different VIV fatigue results...

... risers in realistic current profiles for the Gulf of Mexico (GoM), concluding with the impact this technology could have in reducing costs by increased operability for drilling risers. LGS technology provides significant reduction in VIV response whilst maintaining similar buoyancy to conventional...

... Abstract Information about near-surface currents provided in near-real-time is required in a variety of applications. However, direct measurements of near-surface currents are scarce. In the Gulf of Mexico, the oil industry has been collecting current profiles from deepwater rigs, platforms...

... Abstract Extreme N-year current profiles for Loop Current and Eddies (LCE) are required for the strength and fatigue assessment of the risers and wellhead/casing systems. The profiles for different return periods (i.e., N = 1, 10, 100, etc.) are derived from an extreme value analysis (EVA...

.... Generation of Combined LCE and Hurricane Metocean Approach I When a LCE affects a site, it could persist for weeks or even months. During that period, the current speed may fluctuate due to the meanderings of the eddy, however, the current direction is fairly stable. Approach I used measured current profile...

... and wellhead/casing systems using a site-specific scatter diagram of LCE. A scatter diagram consists of a number of full-depth current speed profiles and associated probabilities of occurrence for each profile. Scatter diagrams often consist of too many current profiles, which can make the VIV analysis...

... events in the second half of 2014 and how the actual motions compare with predicted motions. spar fatigue damage subsea system stiffness reduction current profile mooring system strake configuration hull amplitude tension range vim response artificial intelligence fairlead fatigue...

... Abstract We discuss the results of a process-oriented analysis of current profile measurements collected from 2005 through 2010 in the Gulf of Mexico by oil industry operators, who are required to measure ocean current profiles and transmit these data in near-real-time. The individual data...

... spar vortex amplitude test program variation current profile reynolds number turbulence coefficient subsea system vim flow speed drag coefficient upstream oil & gas hull fpso vim response natural period flume tank vibration vim amplitude floating production system...

... Abstract Kuroshio is a major global current that flows near the east coasts of Taiwan and Japan. Kuroshio is a relatively strong current with typical speeds of 3 to 5 knots at the water surface. It is important to properly understand extreme current profiles of these currents for any drilling...

... the current profiles to be used in the riser/Tension Leg Platform (TLP) tendon Vortex Induced Vibration (VIV) fatigue study described in this paper. In particular, based on the analysis of current characteristics, ocean current kinetic energy distribution and observational data availability; four...

... and knowledge of the highcurrents along the continental slope, the various deepwater measurementscollected in the past have not been analyzed in a systematic way to gainunderstanding as to how current profile shapes change when moving from theslope into deeper waters. Recent oceanographic literature is reviewed...

..., and those in between. According to the eXpendable BathyThermographs (XBTs) temperature data across Eddy Zorro in June and July 2007, the 15°C contours are located around 300 m. An Emperical Orthogonal Functions (EOF) analysis method was also applied to identify the characteristics and major current profile...

..., Production) The field location of all items covered by Scope of Work is shown in Figure 1. Current Profiles Based on the Frade field metocean data, two current profiles ha drag force may occur either at the surface or at the seabed. Th by the red line in Figure 2 represents the bottom current prof line...

..., the DNV-OS-F201 code [6] was used in this work. optimization procedure riser upstream oil & gas otc 20777 riser configuration steel lazy wave riser configuration installation analysis artificial intelligence offshore technology conference floater current profile evolutionary...

... current profiles for deepwater up to 1800 meters present the characteristic of being composed by two layers coming from different generation sources. These layers most of the time present different directions. The first layer covers the depths from sea level to levels around 300 to 400 meters, going...

..., such as risers, caused by vortex induced vibrations (VIV) in the cross-flow direction, originated from sheared currents. However it has some limitations, such as, the planar velocities assumption. It has to be assumed for utilization of the program that the current profile is unidirectional and perpendicular...