Truss Spar Vortex Induced Motions: Benchmarking of CFD and Model Tests

Halkyard, John; Atluri, Sampath; Sirnivas, Senu

doi:10.1115/omae2006-92673

Cited by 11 publications

(11 citation statements)

References 10 publications

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“…The possibility of using CFD codes to compute fully coupled response of deepwater systems including VIM of line structures is wide open (Halkyard et al 2006). While this approach might be computationally very expensive and rather formidable for performing routine global response analysis, it readily accounts for viscous effects, which are important especially in the case of line structures.…”

Section: Fully Nonlinear Hydrodynamic Analysismentioning

confidence: 99%

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Coupled dynamics of deepwater structures – issues and challenges

Vendhan

2014

Ships and Offshore Structures

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Offshore systems consisting of floaters linked to line structures such as risers and mooring lines are favoured for deepwater applications. The dynamic coupling analysis of a floater together with the line structures has been the subject of several studies in recent years. Powerful numerical tools have been developed implementing full-fledged time-domain approaches as well as more efficient frequency-domain approaches for the analysis of deepwater systems. The present article provides a brief overview of coupled analysis techniques employing both time-domain and frequency-domain approaches, focusing on the basic modelling issues and challenges. It is worth formulating compact but sufficiently accurate dynamic models of line structures. The consequence of truncation errors of numerical integration schemes in long-term time-domain simulations needs to be studied. There is a need to standardise the statistical linearisation approach applied to dynamic response which spreads over a very wide frequency range. Verification of the nonlinear drag force model in the Morison equation through basic computational fluid dynamics studies may be undertaken.

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Section: Fully Nonlinear Hydrodynamic Analysismentioning

confidence: 99%

“…Simplified models of VIM are generally used in practical analysis. Of late, CFD tools have been employed to study VIM problems (Halkyard et al 2006).…”

Section: Fluid Forces On Line Structuresmentioning

confidence: 99%

Coupled dynamics of deepwater structures – issues and challenges

Vendhan

2014

Ships and Offshore Structures

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“…Model tests are typically required to validate the performance of the strakes. Halkyard et al (2005Halkyard et al ( , 2006, and Atluri et al (2006) gave results from benchmarking studies that have been conducted over the past few years to compare model tests with computational fluid dynamics (CFD), see Figure 4 for an example of an applied mesh. They also presented 'best practices' for the use of CFD for these classes of problems and issues related to turbulence modelling and meshing of problems at large Reynold's numbers.…”

Section: Application Of Model Tests In Relation To Design Verificationmentioning

confidence: 99%

“…Halkyard et al (2004) and Tahar et al (2005) have compared measured spar responses such as motion and mooring line tensions with numerical predictions. In Halkyard et al (2006), the work was extended based on comparison of the full scale data during hurricane Isidore. Results of time domain and frequency domain simulations were compared with field measurements.…”

Section: Hurricanes and Other Extreme Environmental Eventsmentioning

confidence: 99%

Recent structural design considerations related to floating production systems

Leira

2010

The IES Journal Part A: Civil & Structural Engineering

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Recent studies related to structural design of floating production systems are reviewed. The following topics are considered: (i) Hurricane effects and other extreme environmental events, (ii) Design for arctic conditions, (iii) Application of models tests for design purposes and (iv) Design considerations for particular floating production systems such as spars, tension leg platforms, FPSOs and semisubmersible platforms.

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“…In addition, CFD has become one of the important tools to study VIV at higher Reynolds numbers. Oakley et al (2005), Halkyard et al (2006), and Holmes (2008) are among the contributors to the numerical modelling for risers and spars experiencing VIV at higher Reynolds number. The Reynolds number in the CFD models scale was in the range of 8 × 10 4 < Re < 2.5 × 10 5 .…”

Section: Introductionmentioning

confidence: 99%

Numerical simulations of vortex-induced vibrations on vertical cylindrical structure with different aspect ratios

Rahman

Leggoe

Thiagarajan

et al. 2015

Ships and Offshore Structures

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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 of VIV while varying the aspect ratio. The simulation models represented the actual experimental conditions with idealised free-surface boundary condition to capture the responses from fluid-structure interaction phenomenon. The simulations were performed in the subcritical flow region (7.4 × 10 3 < Re < 2 × 10 5 ), corresponding to a range of reduced velocity (U r ) from 2 to 14. The results of the cases studied were discussed and compared with the experimental data to verify the accuracy and validity of the present simulation. The comparisons have shown a similar curved-shape drag coefficient plot, and however underestimated the value of the drag coefficients over the reduced velocity. Additionally, the simulations seemed to capture a higher lift force response compared with the experimental data for a low aspect ratio. The correlation length was observed to be longer for larger aspect ratio and proportionally decreases as the aspect ratio decreases.

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Truss Spar Vortex Induced Motions: Benchmarking of CFD and Model Tests

Cited by 11 publications

References 10 publications

Coupled dynamics of deepwater structures – issues and challenges

Coupled dynamics of deepwater structures – issues and challenges

Recent structural design considerations related to floating production systems

Numerical simulations of vortex-induced vibrations on vertical cylindrical structure with different aspect ratios

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