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.

An Investigation of the Aerodynamic and Vibration Behavior of a Helicopter Rotor Blade

2020 ◽  
Author(s):  
Mohammad Khairul Habib Pulok ◽  
Uttam K. Chakravarty
Keyword(s):  
Rotor Blade ◽  
Fluid Structure Interaction ◽  
Interaction Model ◽  
Scale Model ◽  
Helicopter Rotor ◽  
Small Scale ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Aerodynamic Analysis ◽  
Helicopter Rotor Blade

Abstract Rotary-wing aircrafts are the best-suited option in many cases for its vertical take-off and landing capacity, especially in any congested area, where a fixed-wing aircraft cannot perform. Rotor aerodynamic loading is the major reason behind helicopter vibration, therefore, determining the aerodynamic loadings are important. Coupling among aerodynamics and structural dynamics is involved in rotor blade design where the unsteady aerodynamic analysis is also imperative. In this study, a Bo 105 helicopter rotor blade is considered for computational aerodynamic analysis. A fluid-structure interaction model of the rotor blade with surrounding air is considered where the finite element model of the blade is coupled with the computational fluid dynamics model of the surrounding air. Aerodynamic coefficients, velocity profiles, and pressure profiles are analyzed from the fluid-structure interaction model. The resonance frequencies and mode shapes are also obtained by the computational method. A small-scale model of the rotor blade is manufactured, and experimental analysis of similar contemplation is conducted for the validation of the numerical results. Wind tunnel and vibration testing arrangements are used for the experimental validation of the aerodynamic and vibration characteristics by the small-scale rotor blade. The computational results show that the aerodynamic properties of the rotor blade vary with the change of angle of attack and natural frequency changes with mode number.

Fluid–Structure Interaction of High Aspect-Ratio Hair-Like Micro-Structures Through Dimensional Transformation Using Lattice Boltzmann Method

2016 ◽  
Vol 08 (08) ◽  
pp. 1650095 ◽  
Author(s):  
H. Devaraj ◽  
Kean C. Aw ◽  
E. Haemmerle ◽  
R. Sharma
Keyword(s):  
Fluid Flow ◽  
Drag Force ◽  
Lattice Boltzmann ◽  
Stokes Equations ◽  
Fluid Structure Interaction ◽  
Structural Response ◽  
Momentum Exchange ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Micro Structures

3D printed hair-like micro-structures have been previously demonstrated in a novel micro-fluidic flow sensor aimed at sensing air flows down to rates of a few milliliters per second. However, there is a lack of in-depth understanding of the structural response of these ‘micro-hairs' under a fluid flow field. This paper demonstrates the use of lattice Boltzmann methods (LBM) to understand this structural response towards a better optimization of the micro-hair flow sensors designed to suit the end applications' needs. The LBM approach was chosen as an efficient alternative to simulate Navier–Stokes equations for modeling fluid flow around complex geometries primarily for improved accuracy and simplicity with lesser computational costs. As the spatial dimensions of the sensor's flow channel are much larger in comparison to the actual micro-hairs (the sensing element), a multidimensional approach of combining two-dimensional (D2Q9) and three-dimensional (D3Q19) lattice configurations were implemented for improved computational speeds and efficiency. The drag force on the micro-hairs was estimated using the momentum-exchange method in the D3Q19 configuration and this drag force is transferred to the structural analysis model which determines the micro-hair deformation using Euler–Bernoulli beam theory. The entirety of the LBM Fluid–Structure Interaction (FSI) model was implemented within MATLAB and the obtained results are compared against the numerical model implemented on a commercially available software package.

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.

Whipping response analysis by one way fluid structure interaction—A case study

2015 ◽  
Vol 103 ◽  
pp. 10-20 ◽  
Author(s):  
Sharad Dhavalikar ◽  
Sachin Awasare ◽  
Ramkumar Joga ◽  
A.R. Kar
Keyword(s):  
Fluid Structure Interaction ◽  
Response Analysis ◽  
Fluid Structure ◽  
Structure Interaction

scholarly journals A Technique For Lock-In Prediction On A Fluid Structure Interaction Of Naca 0012 Foil With High Re

2020 ◽  
pp. 495-509
Author(s):  
Nu Rhahida Arini ◽  
Stephen R. Turnock ◽  
Mingyi Tan
Keyword(s):  
Interaction Analysis ◽  
Fluid Structure Interaction ◽  
Total Force ◽  
Transform Method ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Reynolds Number Flow ◽  
History Of ◽  
Lock In ◽  
Naca 0012

A numerical lock-in prediction technique of a NACA 0012 hydrofoil, immersed in a flow having a Re of 3.07x106 is proposed in this paper. The technique observes the foil’s response as part of a fluid-structure interaction analysis. The response is modelled by foil’s vibration which is represented by spring and damper components. The technique identifies and predicts the foil’s lock-in when it vibrates. The prediction is examined using the Phase Averaged Method which employs the Hilbert Transform Method. The aim of this paper is to propose a numerical way to identify a lock-in condition experienced by a NACA 0012 foil in a high Reynolds number flow. The foil’s mechanical properties are selected and its motions are restricted in two modes which are in the pitch and heave directions. The rotational and transverse lock-in modes are identified in the model. The existence of lock-in is verified using pressure distribution plot, the history of trailing edge displacement and fluid regime capture. The history of total force coefficients is also shown to justify the result. The result shows that the technique can predict reliably the lock-in condition on the foil’s interaction. Three main fluid induced vibration frequencies are generated in the interaction. None of them are close to natural frequency of the foil and lock-in is apparently not found in the typical operational condition.

scholarly journals Numerical Validation of the Two-Way Fluid-Structure Interaction Method for Non-Linear Structural Analysis under Fire Conditions

2021 ◽  
Vol 9 (4) ◽  
pp. 400
Author(s):  
Donghan Woo ◽  
Jung Kwan Seo
Keyword(s):  
Structural Analysis ◽  
Oil Spills ◽  
Proper Time ◽  
Fluid Structure Interaction ◽  
Structural Response ◽  
Offshore Structures ◽  
Fire Dynamics ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Non Linear

Fire accidents on ships and offshore structures lead to complex non-linear material and geometric behavior, which can cause structural collapse. This not only results in significant casualties, but also environmental catastrophes such as oil spills. Thus, for the fire safety design of structures, precise prediction of the structural response to fire using numerical and/or experimental methods is essential. This study aimed to validate the two-way fluid-structure interaction (FSI) method for predicting the non-linear structural response of H-beams to a propane burner fire by comparison with experimental results. To determine the interaction between a fire simulation and structural analysis, the Fire-Thermomechanical Interface model was introduced. The Fire Dynamics Simulator and ANSYS Parametric Design Language were used for computational fluid dynamics and the finite element method, respectively. This study validated the two-way FSI method for precisely predicting the non-linear structural response of H-beams to a propane burner fire and proposed the proper time increment for two-way FSI analysis.

scholarly journals Fluid-Structure Interaction Vibration Response Analysis of the Hydrocyclone Under Periodic Excitation

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 146273-146281 ◽  
Author(s):  
Sen Li ◽  
Ruoning Li ◽  
Zunce Wang ◽  
Dekui Xu ◽  
Yuejuan Yan ◽  
...  
Keyword(s):  
Fluid Structure Interaction ◽  
Vibration Response ◽  
Response Analysis ◽  
Periodic Excitation ◽  
Fluid Structure ◽  
Structure Interaction
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