Capability of a potential-flow solver to analyze articulated multibody offshore modules

Jiang, Changqing; Moctar, Ould el; Schellin, Thomas E.

doi:10.1016/j.oceaneng.2022.112754

Cited by 12 publications

(9 citation statements)

References 18 publications

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“…This is because the properties of the floating module, as well as its superstructures may be different from one to another. Combining our previous studies (Jiang, 2021;Jiang et al, 2021;Jiang et al, 2022a;Jiang et al, 2022b;Jiang and el Moctar, 2023), the procedure of defining the limiting criteria of a module floating concept may be summarized as follows: I. Prepare the geometry and the structural properties of the design module, including mass, center of gravity, moments of inertia, connectors, mooring system, etc.…”

Section: Discussionmentioning

confidence: 99%

“…This section describes the considered floating platform, including main particulars of the floating object as well as its connection and mooring systems. Coming after the test case description, the validation of the adopted numerical model is given, which is summarized from our previous study (Jiang et al, 2022a).…”

Section: Model Description and Validationmentioning

confidence: 99%

“…The experiments of the standard floating module were performed at model scale with a scaling factor of 70, positioned by four horizontal linear spring-like moorings. For further details, see Jiang et al (2022a).…”

Section: Numerical Model Validationmentioning

confidence: 99%

“…Apart from the multibody interactions, it is recognized that nonlinear effects are also important for MFSs, which cannot be neglected in the hydrodynamic calculations of design wave loads. Even so, for strong nonlinear conditions, partial nonlinear methods are challenging to fully reproduce the hydrodynamic process of wavestructure interactions (Jiang et al, 2022a). In this content, fully nonlinear potential-flow solutions have been used in the literature.…”

Section: Introductionmentioning

confidence: 99%

“…restrictions from mechanical joints and mooring systems do need to be taken into account(Jiang et al, 2022a). b. Compute short-term and/or long-term statistical responses of platform.…”

mentioning

confidence: 99%

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Seakeeping criteria of a moored and articulated multibody floating platform in head seas

2023

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Within the Space@Sea project, a multi-use floating concept was proposed by following the analogy of standardization to enlarge a floating platform using a multitude of smaller structures. An operability analysis must be performed to identify its seakeeping criteria and how the criteria limit its functionality. A two-step strategy is proposed to calculate the responses of the target floating concept in head waves, where nonlinearities of the mooring lines and mechanical joints are taken into account. The weakly nonlinear time-domain procedure relies on a diffraction-radiation model in the frequency domain. The motions of floating bodies are solved in the time domain, in which nonlinear Froude-Krylov and hydrostatic forces are estimated under instantaneous incident wave surface. Multibody interactions are resolved under consideration of catenary mooring lines and hinged joints. Wave-induced motions and loads are expressed in terms of transfer function for determining the limiting criteria, including the translational and rotational motions velocities and accelerations; relative motions, velocities and accelerations between module floaters; mooring tensions; as well as hinge forces. Assessments are carried out for various sea conditions against the prescribed values, for the chosen criteria, to address safety issues due to sever platform responses. Different operational requirements for trained workers and untrained passengers of motions and accelerations are taken into consideration. Results show that rotational motions have a significant influence on the platform’s seakeeping performance. Nevertheless, the root mean square (RMS) value of vertical acceleration dominates the comfort of persons onboard, defining the final limiting criterion of the entire platform.

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Section: Discussionmentioning

confidence: 99%

Section: Model Description and Validationmentioning

confidence: 99%

Section: Numerical Model Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…restrictions from mechanical joints and mooring systems do need to be taken into account(Jiang et al, 2022a). b. Compute short-term and/or long-term statistical responses of platform.…”

mentioning

confidence: 99%

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Seakeeping criteria of a moored and articulated multibody floating platform in head seas

2023

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Comparative Study of Numerical Methods for Predicting Wave-Induced Motions and Loads on a Semisubmersible

Gao,

Jiang,

Yang

et al. 2023

J. Marine. Sci. Appl.

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Numerical simulation tools based on potential-flow theory and/or Morison’s equation are widely used for predicting the hydrodynamic responses of floating offshore wind platforms. In general, these simplified approaches are used for the analysis under operational conditions, albeit with a carefully selected approach to account for viscous effects. Nevertheless, due to the limit hydrodynamic modelling to linear and weakly nonlinear models, these approaches severely underpredict the low-frequency nonlinear wave loads and dynamic responses of a semisubmersible. They may not capture important nonlinearities in severe sea states. For the prediction of wave-induced motions and loads on a semisubmersible, this work systematically compares a fully nonlinear viscous-flow solver and a hybrid model combining the potential-flow theory with Morison-drag loads in steep waves. Results show that when nonlinear phenomena are not dominant, the results obtained by the hybrid model and the high-fidelity method show reasonable agreement, while larger discrepancies occur for highly nonlinear regular waves. Specifically, regular waves with various steepness over different frequencies are focused in the present study, which supplements the understanding in applicability of these two groups of method.

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A Kane-based time domain hydrodynamic analysis method for hinged multi-floating bodies under irregular wave conditions

Liu,

Chen,

et al. 2025

Marine Structures

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Capability of a potential-flow solver to analyze articulated multibody offshore modules

Cited by 12 publications

References 18 publications

Seakeeping criteria of a moored and articulated multibody floating platform in head seas

Seakeeping criteria of a moored and articulated multibody floating platform in head seas

Comparative Study of Numerical Methods for Predicting Wave-Induced Motions and Loads on a Semisubmersible

A Kane-based time domain hydrodynamic analysis method for hinged multi-floating bodies under irregular wave conditions

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