• Title/Summary/Keyword: fluid-structural interaction analysis

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Fluid-Structure Interaction Analysis on the Deformation of Simplified Yacht Sails (단순형태 세일의 변형에 대한 유체-구조 연성 해석)

  • Bak, Sera;Yoo, Jaehoon;Song, Chang Yong
    • Journal of the Society of Naval Architects of Korea
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    • v.50 no.1
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    • pp.33-40
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    • 2013
  • Since most of yacht sails are made of thin fabric, they form cambered sail shape that can efficiently generate lift power by aerodynamic interaction and by external force delivered from supporting structures such as mast and boom. When the incident flow and external force alter in terms of volume or condition, the shape of sail also change. This deformation in shape has impact on the peripheral flow and aerodynamic interaction of the sail, and thus it is related to the deformation of the sail in shape again. Therefore, the precise optimization of aerodynamic performance of sail requires fluid-structure interaction (FSI) analysis. In this study, the simplified sail without camber was under experiment for one-way FSI that uses the result of flow analysis to the structural analysis as load condition in an attempt to fluid-structure interaction phenomenon. To confirm the validity of the analytical methods and the reliability of numerical computation, the difference in deformation by the number of finite element was compared. This study reproduced the boundary conditions that sail could have by rigs such as mast and boom and looked into the deformation of sail. Sail has non-linear deformation such as wrinkles because it is made of a thin fabric material. Thus non-linear structural analysis was conducted and the results were compared with those of analysis on elastic material.

FSI Analysis of Piston Tilting for Pneumatic Actuator (공압 액추에이터의 피스톤 틸팅에 관한 FSI 해석)

  • Jang, Sung-Cheol;Jung, Won Taick;Park, Woon-Jae
    • Journal of the Korean Society of Industry Convergence
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    • v.19 no.3
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    • pp.144-153
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    • 2016
  • In this research performed on a pneumatic actuator, the air flow entering and exiting the cylinder, and the motion and deformation characteristics of the piston during operation of the actuator, were predicted. This was carried out by utilizing an FSI(Fluid-Structural Interaction) analysis technique that incorporates principles in computational fluid dynamics and structural stress analysis, and potential performance degradation factors were examined. Analysis results indicated that performance improvements could be made through design modifications. These include adding an inlet and outlet on the upper and lower sections of the cylinder in the conventional model, and increasing the number of sites for piston guide bars from three to four.

Earthquake Response Analysis for 2-D Fluid-Structure-Soil Systems (2차원 유체-구조뭍-지반계의 지진응답해석)

  • 윤정방;장수혁;김재민;홍선기
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2000.04b
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    • pp.289-296
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    • 2000
  • This paper presents a method of seismic analysis for a 2-D fluid-structure-soil interaction systems. With this method, the fluid can be modeled by spurious free 4-node displacement-based fluid elements which use rotational penalty and mass projection technique in conjunction with the one point reduced integration scheme to remove the spurious zero energy modes. The structure and the near-field soil are discretized by the standard 2-D finite elements, while the unbounded far-field soil is represented by the dynamic infinite elements in the frequency domain. Since this method directly models the fluid-structure-soil interaction systems, it can be applied to the dynamic analysis of a 2-D liquid storage structure with complex geometry. Finally, results of seismic analyses are presented for a spent fuel storage tank embedded in a layered half-space and a massive concrete dam on a layered half-space.

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Fluid-structure interaction analysis of deformation of sail of 30-foot yacht

  • Bak, Sera;Yoo, Jaehoon;Song, Chang Yong
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.5 no.2
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    • pp.263-276
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    • 2013
  • Most yacht sails are made of thin fabric, and they have a cambered shape to generate lift force; however, their shape can be easily deformed by wind pressure. Deformation of the sail shape changes the flow characteristics over the sail, which in turn further deforms the sail shape. Therefore, fluid-structure interaction (FSI) analysis is applied for the precise evaluation or optimization of the sail design. In this study, fluid flow analyses are performed for the main sail of a 30-foot yacht, and the results are applied to loading conditions for structural analyses. By applying the supporting forces from the rig, such as the mast and boom-end outhaul, as boundary conditions for structural analysis, the deformed sail shape is identified. Both the flow analyses and the structural analyses are iteratively carried out for the deformed sail shape. A comparison of the flow characteristics and surface pressures over the deformed sail shape with those over the initial shape shows that a considerable difference exists between the two and that FSI analysis is suitable for application to sail design.

Structure-Fluid Interaction Analysis for the Submarine LOX Tank subjected to Underwater Explosion Impact (수중 폭발 충격을 받는 잠수함 액화 산소 탱크의 구조-유체 연성 해석)

  • Shin, Hyung-Cheol;Kim, Gyu-Sung;Kim, Jae-Hyun;Jeon, Jae-Hwang
    • Proceedings of the KSME Conference
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    • 2004.11a
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    • pp.419-424
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    • 2004
  • we performed the underwater explosion analysis for the liquefied oxygen tank - a kind of fuel tank of a mid-size submarine, and tried to verify the structural safety for this structure. First, we reviewed the theory and application of underwater explosion analysis using Structure-Fluid Interaction technique and its finite element modeling scheme. Next, we modeled the explosive and sea water as fluid elements, the LOX tank as structural elements and the interface between two regions as ALE scheme. The effect on shock pressure and impulse of fluid mesh size and shape are also investigated. As the analysis result, the shock pressure due explosion propagated into the water region and hit the structure region. The plastic deformation and the equivalent stress highly appeared at the web frame and the shock mount of LOX structure, but these values were acceptable for design criteria.

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The application of BEM in the Membrane structures interaction with simplified wind

  • Xu, Wen;Ye, Jihong;Shan, Jian
    • Structural Engineering and Mechanics
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    • v.31 no.3
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    • pp.349-365
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    • 2009
  • Membrane structures are quite sensitive to wind and therefore the fluid-solid interaction can not be neglected in dynamic analysis. A boundary element method (BEM) for 3D simulation of wind-structure interaction in tensile membrane structures is presented in this paper. The flow is treated as incompressible and potential. The flow field is solved with boundary element method codes and structural simulation is performed by finite element method software ANSYS. The nonlinear equations system is solved iteratively, with segregated treatment of the fluid and structure equations. Furthermore this method has been demonstrated to be effective by typical examples. Besides, the influence of several parameters on the wind-structure interaction, such as rise-span ratio, prestress and the wind velocity are investigated according to this method. The results provide experience in wind resistant researches and engineering.

Representative Volume Element Analysis of Fluid-Structure Interaction Effect on Graphite Powder Based Active Material for Lithium-Ion Batteries

  • Yun, Jin Chul;Park, Seong Jin
    • Journal of Powder Materials
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    • v.24 no.1
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    • pp.17-23
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    • 2017
  • In this study, a finite element analysis approach is proposed to predict the fluid-structure interaction behavior of active materials for lithium-ion batteries (LIBs), which are mainly composed of graphite powder. The porous matrix of graphite powder saturated with fluid electrolyte is considered a representative volume element (RVE) model. Three different RVE models are proposed to consider the uncertainty of the powder shape and the porosity. P-wave modulus from RVE solutions are analyzed based on the microstructure and the interaction between the fluid and the graphite powder matrix. From the results, it is found that the large surface area of the active material results in low mechanical properties of LIB, which leads to poor structural durability when subjected to dynamic loads. The results obtained in this study provide useful information for predicting the mechanical safety of a battery pack.

A Study of Structure-Fluid Interaction Technique for Submarine LOX Tank under Impact Load of Underwater Explosion (수중폭발 충격하중을 받는 잠수함 액화산소 탱크의 구조-유체 상호작용 기법에 관한 연구)

  • KIM JAE-HYUN;PARK MYUNG-KYU
    • Journal of Ocean Engineering and Technology
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    • v.19 no.1 s.62
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    • pp.20-25
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    • 2005
  • The authors performed the underwater explosion analysis for the liquified oxygen tank - a kind of fuel tank of a mid-size submarine, and tried to verify the structural safety for this structure. First, the authors reviewed the theory and application of underwater explosion analysis, using a Structure-Fluid Interaction technique and its finite element modeling scheme. Next, the authors modeled the explosive and sea water as fluid elements, the LOX tank as structural elements, and the interface between the two regions as the ALE scheme. The effect on shock pressure and impulse of fluid mesh size and shape are also investigated. Upon analysis, it was found that the shock pressure due to explosion propagated into the water region, and hit the structure region. The plastic deformation and the equivalent stress were apparent at the web frame and the shock mount of LOX structure, but these values were acceptable for the design criteria.