... acting upon the structure. This paper outlines an investigation into the hydrodynamic effects on a very large floating structure utilizing a 2D-time domain code. The performance of the seakeeping solver is tested by comparing the results with the 3D solver. The hydrodynamic coefficients derived from...

... Abstract This study examines the influence of buoyancy elements on the VIV responses of a flexible riser using a combined method involving the non-linear time domain VIV prediction program VIVANA-TD and Computational Fluid Dynamics (CFD). Detailed analysis of the flow physics around buoyancy...

... nonlinear direct time domain method based on mixed-Eulerian-Lagrangian (MEL) scheme as opposed to impulse response function (IRF) method is used to simulate parametric rolling in both regular and irregular waves. Computed numerical results of roll amplitude in regular head waves is validated with other...

... Abstract Vortex induced vibrations (VIV) may be developed in the sag-bend area of steel catenary risers (SCRs) and lazy wave risers (SLWRs) induced by the top motions. There is lack of reliable tools to predict VIV responses in such oscillatory flow conditions in the riser design. A time-domain...

... Abstract This paper presents a time-domain S-N fatigue analysis and an approach to reliable and robust engineering criticality assessments to supplement or provide an alternative to S-N fatigue assessments of offshore platform structures based on time domain structural response analysis...

... Abstract Fatigue analysis of flexible risers is a demanding task in terms of time and computational resources. The traditional time domain approach may take weeks of time in global simulation, local modelling and post-processing of riser responses to get fatigue results. Baker Hughes developed...

...STRUCTURAL CONNECTION FATIGUE EVALUATION METHODOLOGY USING TIME DOMAIN APPROACH Sagar Samaria 1, Bob Zhang, Sudhakar Tallavajhula, Johyun Kyoung TechnipFMC Genesis Houston, Texas, U.S.A. ABSTRACT There is an ever-increasing demand for life extension of existing floating platforms worldwide...

... Abstract This paper presents a response-based, time-domain structural fatigue analysis of a floating offshore platform. The conventional technique for structural fatigue assessments of offshore platforms uses a linear, frequency-domain analysis based on the spectral method. Although...

... Abstract The service life of flexible risers is a vital design parameter in offshore field development. The standard approach to calculate fatigue life is the nonlinear time-domain analysis. The approach uses time history of riser responses in local structure assessment to get the fatigue...

... applied. This paper presents a response-based time domain structural analysis of a floating offshore platform. Direct time domain structural analysis is applied by mapping of external environment loads on the floating platform at every instantaneous time interval. Accordingly, correct phase relationship...

... Abstract Evaluation of fatigue damage of offshore flexible risers is critical in flexible riser system design. For deepwater application, irregular wave time domain approach is often adopted as the state of practice to avoid excessive conservatism due to its better representation...

... Vortex Induced Vibration (VIV) of marine risers poses a significant challenge as the offshore oil and gas industry moves into deep water. A time-domain analysis tool has been developed to predict the VIV of marine risers based on a forcing algorithm and by making full use of the available high...

... Based on the panel-free method, large-amplitude motions of floating offshore structures have been computed by solving the body-exact problem in the time domain using the exact geometry. The body boundary condition is imposed on the instantaneous wetted surface exactly at each time step. The free...

... 22 05 2009 The dynamic analysis of a deepwater floating platform and the associated mooring/riser system should ideally be fully coupled to ensure a reliable response prediction. It is generally held that a time domain analysis is the only means of capturing the various coupling...

... benchmark — a simplistic model of a steel frame is chosen. Comparison of results obtained with different load formulations indicated that the buoyancy load was more important than the hydrodynamic load. Floating fish farms finite element analysis time domain intro ing d has on a fram exte is th...

... 07 10 2008 This paper outlines the dynamic analysis of flexible risers in the time and frequency domain using lumped mass discretization, where tension and bending are modeled with extensional and rotational springs respectively. For the time domain analysis, integration is carried out...

... are invariably in the time domain. This has resulted in a much better understanding and confidence in time domain coupled analysis, but less so for the frequency domain approach. In this paper, the viability of frequency domain coupled analysis is explored by performing a systematic comparison of time...