Direct time domain analysis of floating structures with linear and nonlinear mooring stiffness in a 3D numerical wave tank

Thirunaavukarasu, Shivaji Ganesan; Sen, Debabrata

doi:10.1016/j.apor.2015.04.002

Cited by 11 publications

(3 citation statements)

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“…Detailed verification and validation studies of the firstorder force and motion responses computed by the present NWT-based method can be found in our earlier works [16,17]. As the main focus of this paper is on non-linear loads, here we present only the drift force results.…”

Section: Verification and Validationmentioning

confidence: 91%

“…This is achieved by adding the spring forces and moments on surge, sway, and yaw modes of motions. The details of spring stiffness used and its influence on the motion responses are discussed in detail in our earlier work [17]. For the present case, we use a simple linear spring model.…”

Section: Verification and Validationmentioning

confidence: 99%

“…In this work, we present improvements towards prediction of non-linear wave loads following a numerical wave tank (NWT)-based approach for interaction of steep waves with large structures that has been under development [16,17]. This NWT-based method has been developed assuming linearity of the perturbation effects consisting of wave diffraction and radiation.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of non-linear wave loads on large floating structures using a 3D numerical wave tank approach

Ganesan

Sen

2019

Mar Syst Ocean Technol

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In the present work, non-linear wave loads acting on large floating structures are computed using a 3D numerical wave tank (NWT) approach in an approximate manner. The hydrodynamic initial boundary value problem is solved following a Rankine panel-based boundary element method in conjunction with time integration of free-surface constraints and bodymotion equations. To enable long-duration simulation for practical offshore configurations, total velocity potential is split into incident and perturbation part, and the latter effects are linearized. In our earlier works (Ganesan and Sen in J Ocean Eng Mar Energy 1:299-324, 2015; Ganesan and Sen in Appl Ocean Res 51:153-170, 2015), the 2nd order contributions from the linearized perturbation potential were neglected. In this work, we propose a modified formulation for the external load in which the full non-linear loads from the incident wave and up to 2nd order loads from the linear perturbation potential are considered. After presenting some results to validate the present method for steady drift force computations, non-linear loads from the modified formulation are compared with the unmodified form of the method and also with widely used 3D frequency-domain Green-function-based method. Comparative results between these three computations are presented for different geometries and the results are discussed to bring out the relative advantage of the modified formulation in predicting non-linear loads across the range of frequency and wave steepness. Keywords 3D numerical wave tank • Rankine panel method • Direct time domain • Higher order forces • Non-linear wave • Mean drift forces * Shivaji Ganesan T.

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Section: Verification and Validationmentioning

confidence: 91%

Section: Verification and Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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