A Direct Assessment Approach for Structural Strength Evaluation of Cargo Containment System Under Sloshing Inside LNGC Tanks Based on Fluid Structure Interaction

2008 ◽  
Author(s):  
Hisashi Ito ◽  
Yongsuk Suh ◽  
Sangeon Chun ◽  
Y. V. Satish Kumar ◽  
Munkeun Ha ◽  
...  
Keyword(s):  
Structural Strength ◽  
Fluid Structure Interaction ◽  
Structural Safety ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Direct Assessment ◽  
Containment System ◽  
Assessment Approach ◽  
Technical Issues ◽  
Membrane Type

The sloshing phenomenon is one of the most important and challenging issues for the design of cargo containment systems of LNG carriers and is being studied by various research groups in many countries. In this paper, a direct assessment approach based on fluid structure interaction is proposed to assess the structural safety of cargo containment systems against extreme sloshing loads. In the course of developing the methodology, two technical issues are mainly dealt with; (1) how to efficiently apply a numerical method for sloshing phenomena and (2) how to verify the structural safety criteria of cargo containment system against sloshing. The developed methodology is applied to a membrane-type cargo containment system of a large LNG carrier built in Samsung Shipyard.

Strength Evaluation of LNG Containment System Considering Fluid-Structure Interaction Under Sloshing Impact Pressure

2007 ◽  
Author(s):  
Bo Wang ◽  
Jang Whan Kim
Keyword(s):  
Comparative Method ◽  
Fluid Structure Interaction ◽  
Operating Conditions ◽  
Impact Pressure ◽  
Acoustic Medium ◽  
Strength Evaluation ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Containment System ◽  
Membrane Type

As LNG carriers become larger and new operating conditions are being designed, it is essential to develop a new procedure for the strength evaluation of a membrane-type LNG containment system under sloshing loads. The conventional comparative method based on existing service experiences and previous damage cases is currently used in most cases, but this method is only valid for designing new LNG carriers with similar size and type of existing ones. In this study, an analytical solution of acoustic-solid interaction has been derived and a simple 2D coupled acoustic-solid model has been simulated to investigate hydro-elastic effects for the verification purpose. After validation of FE modeling, a coupled model considering the fluid-structure interaction between LNG and containment system has been developed for structural analysis of LNG Mark III containment system. For LNG Mark III containment system, nonlinear dynamic FE analysis under sloshing impact pressure has been conducted using the fluid-structure coupling model. In FE simulations, the hydro-elastic effect in structural response has been studied through considering LNG as an acoustic medium, foam as a visco-elastic material, plywood as an orthotropic material, and mastic as an isotropic material. Parametric study has also been done to investigate the effects of material properties and loading patterns on hydro-elastic response in the coupled fluid-structure model. Based on FE results and experimental data, the strength of LNG Mark III containment system has been evaluated in terms of acceptance criteria. Finally, the new procedure has been developed for the strength evaluation of membrane-type LNG containment systems.

Strength Analysis of Oil Tanker Under Numerical Wave

2018 ◽  
Author(s):  
Cheng Shu ◽  
Li Hong ◽  
Zhang Dongxu
Keyword(s):  
Structural Strength ◽  
Fluid Structure Interaction ◽  
Ocean Waves ◽  
Wave Action ◽  
Stokes Wave ◽  
Strength Analysis ◽  
Two Phase ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Equivalent Load

The strength of an oil carrier is generally checked using static load or equivalent load of wave action in accordance with relevant specifications. In order to accurately calculate the stress and the deformation of an oil carrier under wave action, the fluid-structure interaction system in the platform Workbench is used in this work. And, the pressure-based solver, the two-phase flow model and UDF (User Defined Function) in the software FLUENT are used to compile the three-order Stokes Wave so as to simulate ocean waves. Forces acting on the surface of the oil carrier are obtained by calculating the flow field, and the structural strength of the carrier is then investigated under sagging and hogging conditions. The results show that: the three-order Stokes Wave matches well with the theoretical result, and it is feasible to research the strength of the oil carrier by generating waves using this numerical method. In addition, the method of fluid-structure interaction is applied to investigate the structural strength of the fully-loaded carrier under sagging and hogging conditions.

Structural Response Analysis of LNG CCS Experiencing the Sloshing Impact Determined by Both Convolution and Fluid Structure Interaction Method

2013 ◽  
Author(s):  
Se Yun Hwang ◽  
Jang Hyun Lee ◽  
Sung Chan Kim ◽  
In Sik Nho ◽  
Beom Seon Jang ◽  
...  
Keyword(s):  
Structural Strength ◽  
Fluid Structure Interaction ◽  
Structural Response ◽  
Computation Time ◽  
Scale Model ◽  
Small Scale ◽  
Response Analysis ◽  
Fluid Structure ◽  
Structure Interaction ◽  
History Of

Sloshing assessment of LNG cargo tanks is expected to satisfy the required structural strength of insulation components. It is difficult to estimate the sloshing pressure and structural response of cargo containment in real size because of the uncertainty of intensive computation time as well as the complexity of sloshing motion. In this study, several procedural components are suggested to meet the endurable strength of LNG CCS during the design of LNG cargo containment. The measured sloshing impacts from small scale model test are treated by individual impacts. Thereafter, static and transient structural response of LNG CCS is sequentially performed in order to evaluate the structural strength. The structural response is also calculated in time series through convolution method considering the history of pressure. It is used to investigate the structural response induced by the history of impacts. Finally, an idealized fluid structure interaction on the localized insulation panel is investigated in order to evaluate the structural strength in actual scale.

scholarly journals Fluid–Structure Interaction Numerical Analysis of a Small, Urban Wind Turbine Blade

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1832 ◽  
Author(s):  
Michal Lipian ◽  
Pawel Czapski ◽  
Damian Obidowski
Keyword(s):  
Wind Turbine ◽  
Structural Strength ◽  
Fluid Structure Interaction ◽  
Point Of View ◽  
Operating Conditions ◽  
Strength Analysis ◽  
Fluid Structure ◽  
Rotor Aerodynamics ◽  
Structure Interaction ◽  
Small Wind Turbine

While the vast majority of the wind energy market is dominated by megawatt-size wind turbines, the increasing importance of distributed electricity generation gives way to small, personal-size installations. Due to their situation at relatively low heights and above-ground levels, they are forced to operate in a low energy-density environment, hence the important role of rotor optimization and flow studies. In addition, the small wind turbine operation close to human habitats emphasizes the need to ensure the maximum reliability of the system. The present article summarizes a case study of a small wind turbine (rated power 350 W @ 8.4 m/s) from the point of view of aerodynamic performance (efficiency, flow around blades). The structural strength analysis of the blades milled for the prototype was performed in the form of a one-way Fluid–Structure Interaction (FSI). Blade deformations and stresses were examined, showing that only minor deformations may be expected, with no significant influence on rotor aerodynamics. The study of an unorthodox material (PA66 MO polyamide) and application of FSI to examine both structural strength and blade deformation under different operating conditions are an approach rarely employed in small wind turbine design.

Experimental and Numerical Investigation Into the Effects of Fluid-Structure Interaction on the Sloshing Impact Loads in Membrane LNG Carrier

2008 ◽  
Author(s):  
Jong-Jin Jung ◽  
Hyun-Ho Lee ◽  
Tae-Hyun Park ◽  
Young-Woo Lee
Keyword(s):  
Numerical Simulations ◽  
Numerical Study ◽  
Fluid Structure Interaction ◽  
Impact Pressure ◽  
Natural Period ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Pressure Peak ◽  
Membrane Type ◽  
The Impact

The hydro-elasticity effect of sloshing loads in LNG cargo tank has been studied through experiments and numerical simulations regarding the fluid-structure interaction between sloshing impact pressures and tank structures. Sloshing model tests with 1/50 scale membrane type tanks were carried out for 1-D regular harmonic motion to investigate variations of impact pressures due to elasticity differences of the tank structure. Numerical simulations were performed and validated for the same case. Additionally, wall impinging jet flow was simulated by numerical simulation to verify the relation between elasticity of structure and impact pressure. It was commonly observed that the elasticity of the tank structure had significant influence on the height and shape of the impact pressure peak. Numerical study showed that the ratio between the structural natural period and the duration of the impact pressure is important for the influence of impact pressure on the tank structure.

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