Abstract
Sloshing flows of liquid natural gas (LNG) with multi-phase flow characteristics consisting of liquids and gases can affect the load conditions and structural response of cargo containment systems (CCS). The compressible properties of the sloshing flow can limit the maximum pressure, so a multi-phase fluid model is required to represent the sloshing physics. In this study, we identified a suitable numerical model to simulate the sloshing flow and structural strength evaluation based on the inhomogeneous fluid model. The computational fluid dynamics (CFD) is based on a Eulerian domain model, which is in turn based on the constant volume based finite element method (CVFEM) in a commercial Reynolds-averaged Navier–Stokes CFD code (ANSYS CFX). It includes the interphase momentum transfer between the liquids and gasses. The physics for the sloshing assessment were considered to identify the main aspects of the inhomogeneous multiphase model. For numerical analysis of the sloshing, we conducted a sloshing simulation on the experimental data of the model scale to examine the validity of the results. The velocity of the sloshing flow was extended to the real scale and applied to a local two-way fluid structure interaction (FSI) analysis model. Structural strength evaluation of the LNG CCS by sloshing flow was performed by FSI analysis. Through the example of structural response analysis of Mark III type CCS, the results were discussed and effectiveness of the proposed structural response assessment model by sloshing was reviewed.
Highlights
Published: 12 August 2021Generally, when a containment system filled with fluid cargo is subjected to a disturbance from external motion, a fluid free surface may experience large fluctuating motion.This phenomenon is known as sloshing
The phase difference generated at this time is thought to be from the error that occurs since the motion condition applied in the experiment does not exactly match the natural frequency of the model test calculated by Equation (10)
In this paper we discuss using an inhomogeneous fluid and localized fluid structure interaction (FSI) model as a structural strength assessment model by sloshing with multi-phase computational fluid dynamics (CFD) model based on the Eulerian-Eulerian approach
Summary
When a containment system filled with fluid cargo is subjected to a disturbance from external motion, a fluid free surface may experience large fluctuating motion. In the direct procedure it is difficult to investigate the hydro-elasticity effect of the sloshing pressure since the time series history of the sloshing impact loads is simplified into an idealized triangular form. To evaluate the structural strength of the LNG CCS subjected to sloshing loads, it is necessary to make a reasonable evaluation that reflects the hydro-elasticity effect and apply it in a method appropriate to the structural strength evaluation through a sloshing fluid structure interaction (FSI) analysis method [15,16]. CFD model, combined with the FSI method, performed a structural strength evaluation of LNG CCS by sloshing impact on the Mark III type CCS model. We discussed the results of structural response analysis of Mark III type CCS reviewed in this study and investigated the effectiveness of the FSI model on structural response evaluation by the proposed sloshing simulation model
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