Wave-current interaction on offshore spar platforms

Tuhaijan, Siti Nor Adha; John, Kurian V.; Liew, Mohd Shahir

doi:10.1109/natpc.2011.6136354

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…Every offshore structure before its design requires the analysis of such hydrodynamic forces. Offshore structures have been studied by many authors using frequency domain analysis [13][14][15] and Time domain analysis [13,[15][16][17]. The forces have been determined by using the Morison equation and linear diffraction wave theory.…”

Section: Previous Studiesmentioning

confidence: 99%

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Some Recent Fluid-Structure Interaction Approaches for the Wave Current Behaviour With Offshore Structures

Ahmed

Nizamani

Nakayama

et al. 2020

CFDL

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The effects of the surface waves generated by the wind have a significant effect on the currents. A wave current coupled model plays an important role in the design offshore structures. The interaction between fluids such as incompressible ocean waves and current and offshore structures is significant with many real-time applications in offshore engineering. These coupled models can be applied to Offshore Floating Production Operating and offloading (FPSO), Wind or current turbines and offshore pipelines. The complex issues related to the design are analyzed by using Computational Fluid Dynamics, which requires an investigation of the multiphase flow between wave and current and the structure which is considered restrictive due to the computational cost. If viscous effects are neglected then the single-phase flow models have been recommended, where wave-current interaction have been modelled successfully. Models have been developed where velocities and pressure are computed and the results can be verified with the experimental results available in the literature. In this study the existing numerical methods, mesh types are discussed along with their coupling methods. Here single-phase and multiphase models with small and medium movement are reviewed and their applications are highlighted. Commercial CFD code ANSYS Fluent has been found most reliable and easy to use tool for the analysis of fluid flow interacting with offshore structures near the free surface. It can successfully be used for determination of fluid dynamics of offshore environments installed complex multi-component structures. Dynamic mesh facility is more useful for multiphase modelling of floating structures.

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Section: Previous Studiesmentioning

confidence: 99%

“…(13), modified equation can be written as Eq. 14= − (14) where is the absolute frequency and is encounter frequency.…”

Section: Wave and Current Fields In Offshore Environmentsmentioning

confidence: 99%

Some Recent Fluid-Structure Interaction Approaches for the Wave Current Behaviour With Offshore Structures

Ahmed

Nizamani

Nakayama

et al. 2020

CFDL

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“…During the past four decades, more than 60 major fire accidents have been reported on offshore oil/gas platforms . The total number of platforms of various types that have been installed worldwide exceeds 10,000 units . Fire accidents in offshore facilities can lead to partial or total collapse or sinking of an offshore platform with serious consequences including the loss of lives, the destruction of properties, and damages to the environment .…”

Section: Introductionmentioning

confidence: 99%

Model fire tests on a beam‐to‐leg connection in an offshore platform topside

et al. 2013

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Beam‐to‐column connections are of great significance as they noticeably influence the mechanical behavior of structures at ambient and elevated temperatures. Observations from full‐scale fire tests confirm that connections play an important role on the resistance time of structural components in fire. Because of the high cost of elevated temperature tests, adequate experimental data on a broad range of connections are not available. One type of such connections is the I‐beam‐to‐circular tubular leg connections in offshore oil/gas platform topsides. Considering the high risk of fire events in offshore oil/gas platforms, our study focuses on the structural behavior of this type of connection at elevated temperatures. Eleven small‐scale experimental tests were conducted on a uniplanar welded steel I‐beam‐to‐tubular chord connection with external diaphragms to investigate their fire resistance capacity. Local strengthening and partial thermal insulating were separately introduced to the connection components. The results show that the external diaphragms play a considerably more important role on the connection fire response as compared with that for the vertical stiffeners. It is also found that the degradations in the connections' stiffness at elevated temperature might be closely correlated with the classical thermomechanical data on steel material. Copyright © 2013 John Wiley & Sons, Ltd.

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