Large-amplitude time-domain simulation tool for marine and offshore motion prediction

Somayajula, Abhilash; Falzarano, Jeffrey

doi:10.1007/s40868-015-0002-7

Cited by 25 publications

(10 citation statements)

References 22 publications

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“…Morison's Equation [6] N/A 2 Linear time (frequency) domain potential flow [7] AQWA [7], WAMIT [8], Nemoh [9] 3 Blended time-domain potential flow [10] WEC-Sim [11], SIMDYN [12] 4 Nonlinear time-domain potential flow [13] Aegir [13] 5…”

Section: Methodsmentioning

confidence: 99%

Development of a Blended Time-Domain Program for Predicting the Motions of a Wave Energy Structure

Wang

Somayajula

Falzarano

et al. 2019

JMSE

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Traditional linear time-domain analysis is used widely for predicting the motions of floating structures. When it comes to a wave energy structure, which usually is subjected to larger relative (to their geometric dimensions) wave and motion amplitudes, the nonlinear effects become significant. This paper presents the development of an in-house blended time-domain program (SIMDYN). SIMDYN’s “blend” option improves the linear option by accounting for the nonlinearity of important external forces (e.g., Froude-Krylov). In addition, nonlinearity due to large body rotations (i.e., inertia forces) is addressed in motion predictions of wave energy structures. Forced motion analysis reveals the significance of these nonlinear effects. Finally, the model test correlations examine the simulation results from SIMDYN under the blended option, which has seldom been done for a wave energy structure. It turns out that the blended time-domain method has significant potential to improve the accuracy of motion predictions for a wave energy structure.

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Section: Methodsmentioning

confidence: 99%

Development of a Blended Time-Domain Program for Predicting the Motions of a Wave Energy Structure

Wang

Somayajula

Falzarano

et al. 2019

JMSE

Self Cite

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“…However, the frequency domain approach does not consider the nonlinearities in its calculation [102]. Due to that reason, the prediction of a specific critical condition was sometimes under-predicted or over-predicted, which gave inconsistent actual values [156,157]. Thus, to improve these prediction values, the probabilistic-based time domain was preferred.…”

Section: Overall Review Of the Probabilistic Domains On Offshore Structural Assessmentmentioning

confidence: 99%

Offshore Structural Reliability Assessment by Probabilistic Procedures—A Review

Ahmad

Husain²,

Zaki³

et al. 2021

JMSE

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Offshore installations must be built to resist fatigue as well as extreme forces caused by severe environmental conditions. The structural reliability analysis is the popular practise to assess a variety of natural waves determined by the long-term probability distribution of wave heights and corresponding periods on the site. In truth, however, these structures are subjected to arbitrary wave-induced forces in the open ocean. Hence, it is much more reasonable to account for the changed loading characteristics by determining the probabilistic characteristics of the random loads and outcomes responses. The key challenges are uncertainties and the non-linearity of Morison’s drag element, which results in non-Gaussian loading and response distributions. This study would analyze advances achieved to date in a comprehensive probabilistic review of offshore fixed jacket-type platforms.

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“…The viscous roll damping formulation described above has been implemented in FORTRAN and incorporated into the in-house nonlinear time domain simulation tool -SIMDYN -developed at Marine Dynamics Laboratory, Texas A&M University (Somayajula and Falzarano 2015a). A numerical simulation of the free decay test of APL China at 5 knots forward speed is compared with the experimental data for the same ship obtained from MARIN.…”

Section: Comparison Of Roll Damping Prediction Against Experimentsmentioning

confidence: 99%

An overview of the prediction methods for roll damping of ships

Falzarano¹,

Somayajula

Seah³

2015

Ocean Systems Engineering

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Of all the six degrees of freedom, the roll motion of a ship is the most poorly understood and displays complicated phenomena. Due to the low potential wave damping at the natural frequency, the effective analysis of ship roll dynamics comes down to the accurate estimation of the viscous roll damping. This paper provides overview of the importance of roll damping and an extensive literature review of the various viscous roll damping prediction methods applied by researchers over the years. The paper also discusses in detail the current state of the art estimation of viscous roll damping for ship shaped structures. A computer code is developed based on this method and its results are compared with experimental data to demonstrate the accuracy of the method. While some of the key references describing this method are not available in English, some others have been found to contain typographic errors. The objective of this paper is to provide a comprehensive summary of the state of the art method in one place for future reference.

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Large-amplitude time-domain simulation tool for marine and offshore motion prediction

Cited by 25 publications

References 22 publications

Development of a Blended Time-Domain Program for Predicting the Motions of a Wave Energy Structure

Development of a Blended Time-Domain Program for Predicting the Motions of a Wave Energy Structure

Offshore Structural Reliability Assessment by Probabilistic Procedures—A Review

An overview of the prediction methods for roll damping of ships

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