[2018] One-way versus two-way fluid-structure interaction analyses of offshore installations in fires > Selected Papers

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Selected Papers

[2018] One-way versus two-way fluid-structure interaction analyses of …

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Author Admin 작성일18-10-19 13:30 Hit74 Count Comments0 Count

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FABIG Newsletter, Issue 74, September 2018
One-way versus two-way fluid-structure interaction analyses of offshore installations in fires

Author(s): J.K. Paik, S.J. Kim, K.S. Lee, B. Park and M.S. Ki
Abstract:
For safety studies of structural systems in fires, the effects of time-varying geometry and material properties due to changes in temperatures should be taken into account in fluid-structure interaction (FSI) analysis. In the industry, the so-called one-way FSI analysis is often adopted for the purpose of simplicity and convenience, whereby the fire loads are defined as a first step, and are then applied in the structural response analysis in the next step. On the other hand, the so-called two-way FSI analysis is often adopted when a more refined analysis is required where both the fire load definition and structural response analysis are carried out simultaneously. The benefits of the two-way FSI analysis method include that the effects of time-varying geometry and material properties can be accounted for. The objective of the present study is to examine the impacts of the application of the two-way FSI analysis method in association with nonlinear structural response in fire by making a comparison with the results of the one-way FSI analysis of offshore structures in jet and pool fires. The two-way FSI analysis method applied in the present study is a rather simplified technique whereby the one-way FSI analyses are repeated at a small time interval determined in advance. In this method, geometry and material properties are redefined at every incremental time step, and both CFD (computational fluid dynamics) and NLFEA (nonlinear finite element analysis) are performed at the corresponding time step. It is concluded that the traditional one-way FSI analysis method is not always practicable, and thus it is recommended to apply the two-way FSI analysis method for more refined safety studies.

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