유체-구조 연성해석을 통한 축류펌프의 진동 연구

이보람(Bo-Ram Lee),윤태종(Tae-Jong Yun),오원빈(Won-Bin Oh),이충우(Chung-Woo Lee),김학형(Hak Hyoung Kim),정영재(Yeong Jae Jeong),김일수(Ill-Soo Kim) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.3

Pressure, which is a dynamic characteristic of a floodgate, is predicted using an FSI analysis method. A fluid analysis model and a hydrology analysis model were used as analysis models. As a result of the analysis, we found that a warped model has smaller acceleration than a square model. Additionally, this numerical analysis technique was applied to the actual hydrology, and the analysis results were compared with the results of the vibration tests. As a result, we confirmed that there is a small difference between the results of the vibration tests and the results of the FSI analysis. Through this analysis, the applicability and reliability of the FSI analysis method were verified. We concluded that the pressure of a floodgate can be measured through an FSI analysis method.

Nonlinear structural response in jet fire in association with the interaction between fire loads and time-variant geometry and material properties

Kim, S.J.,Lee, J.,Kim, S.H.,Seo, J.K.,Kim, B.J.,Ha, Y.C.,Paik, J.K.,Lee, K.S.,Park, B.,Ki, M.S.,Sohn, J.M. Pergamon Press 2017 Ocean engineering Vol.144 No.-

For safety design of structures against fire loads, time-variant geometry and material properties depending on the temperature should be considered with fluid-structure interaction (FSI) analysis. One-way FSI analysis is generally applied due to a time consuming task. But, it has big difference of structural response between conducting one-way and two-way FSI analysis. And two-way analysis is also affected by time increment of analysis for updating the geometry, and fire loads. The aim of this study is to investigate the effect of time increments on two-way FSI analysis of structures subjected to jet fire, and to suggest a proper time increment for two-way FSI analysis. In the present study, geometries and material properties are updated at every time increments, and kinds of two-way FSI analysis are performed with different time increments by using computational fluid dynamics (CFD) and nonlinear finite element analysis (NLFEA) and an interface program between CFD and NLFEA.

A fluid-structure interaction analysis for the prediction of blood flow in saccular aneurysm

Sang Hyuk Lee,Nahmkeon Hur,Seongwon Kang 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11

Recently, the rapid evolution of numerical methodologies for CFD and structural analyses made it possible to predict the arterial hemodynamics closely related to vascular diseases. A realistic fluid-structure interaction (FSI) analysis has been performed to predict arterial hemodynamics accurately with emphasis on the blood flow affected by the wall motion of compliant arteries. In the present study, a framework for the FSI analysis was developed by coupling the CFD and structural analyses based on the iterative coupling method. Using this framework, the numerical results from a FSI analysis on the hemodynamics in a saccular aneurysm were compared to those of an analysis without FSI. From the results, it was found that a FSI analysis needs to be performed to obtain accurate hemodynamic characteristics in the saccular aneurysm, because the blood flow in the saccular aneurysm is mainly produced by the wall motion of aneurysmal sac during a cardiac cycle.

Evaluation of sloshing resistance performance for LNG carrier insulation system based on fluid-structure interaction analysis

Lee, Chi-Seung,Cho, Jin-Rae,Kim, Wha-Soo,Noh, Byeong-Jae,Kim, Myung-Hyun,Lee, Jae-Myung The Society of Naval Architects of Korea 2013 International Journal of Naval Architecture and Oc Vol.5 No.1

In the present paper, the sloshing resistance performance of a huge-size LNG carrier's insulation system is evaluated by the fluid-structure interaction (FSI) analysis. To do this, the global-local analysis which is based on the arbitrary Lagrangian-Eulerian (ALE) method is adopted to accurately calculate the structural behavior induced by internal LNG sloshing of a KC-1 type LNG carrier insulation system. During the global analysis, the sloshing flow and hydrodynamic pressure of internal LNG are analyzed by postulating the flexible insulation system as a rigid body. In addition, during the local analysis, the local hydroelastic response of the LNG carrier insulation system is computed by solving the local hydroelastic model where the entire and flexible insulation system is adopted and the numerical analysis results of the global analysis such as initial and boundary conditions are implemented into the local finite element model. The proposed novel analysis techniques can potentially be used to evaluate the structural integrity of LNG carrier insulation systems.

Evaluation of sloshing resistance performance for LNG carrier insulation system based on fluid-structure interaction analysis

이치승,조진래,김화수,노병재,김명현,이제명 대한조선학회 2013 International Journal of Naval Architecture and Oc Vol.5 No.1

In the present paper, the sloshing resistance performance of a huge-size LNG carrier’s insulation system is evaluated by the fluid-structure interaction (FSI) analysis. To do this, the global-local analysis which is based on the arbitrary Lagrangian-Eulerian (ALE) method is adopted to accurately calculate the structural behavior induced by internal LNG sloshing of a KC-1 type LNG carrier insulation system. During the global analysis, the sloshing flow and hydrodynamic pressure of internal LNG are analyzed by postulating the flexible insulation system as a rigid body. In addition, during the local analysis, the local hydroelastic response of the LNG carrier insulation system is computed by solving the local hydroelastic model where the entire and flexible insulation system is adopted and the numerical analysis results of the global analysis such as initial and boundary conditions are implemented into the local finite element model. The proposed novel analysis techniques can potentially be used to evaluate the structural integrity of LNG carrier insulation systems.

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

Bak, Sera,Yoo, Jaehoon,Song, Chang Yong The Society of Naval Architects of Korea 2013 International Journal of Naval Architecture and Oc Vol.5 No.2

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.

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

박세라,유재훈,송창용 대한조선학회 2013 International Journal of Naval Architecture and Oc Vol.5 No.2

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.

Assessment of Thermal Fatigue in Mixing Tee by FSI Analysis

Myung Jo Jhung 한국원자력학회 2013 Nuclear Engineering and Technology Vol.45 No.1

Thermal fatigue is a significant long-term degradation mechanism in nuclear power plants. In particular, as operating plants become older and life time extension activities are initiated, operators and regulators need screening criteria to exclude risks of thermal fatigue and methods to determine significant fatigue relevance. In general, the common thermal fatigue issues are well understood and controlled by plant instrumentation at fatigue susceptible locations. However, incidents indicate that certain piping system Tee connections are susceptible to turbulent temperature mixing effects that cannot be adequately monitored by common thermocouple instrumentations. Therefore, in this study thermal fatigue evaluation of piping system Tee-connections is performed using the fluid-structure interaction (FSI) analysis. From the thermal hydraulic analysis, the temperature distributions are determined and their results are applied to the structural model of the piping system to determine the thermal stress. Using the rain-flow method the fatigue analysis is performed to generate fatigue usage factors. The procedure for improved load thermal fatigue assessment using FSI analysis shown in this study will supply valuable information for establishing a methodology on thermal fatigue.

ASSESSMENT OF THERMAL FATIGUE IN MIXING TEE BY FSI ANALYSIS

Jhung, Myung Jo Korean Nuclear Society 2013 Nuclear Engineering and Technology Vol.45 No.1

Thermal fatigue is a significant long-term degradation mechanism in nuclear power plants. In particular, as operating plants become older and life time extension activities are initiated, operators and regulators need screening criteria to exclude risks of thermal fatigue and methods to determine significant fatigue relevance. In general, the common thermal fatigue issues are well understood and controlled by plant instrumentation at fatigue susceptible locations. However, incidents indicate that certain piping system Tee connections are susceptible to turbulent temperature mixing effects that cannot be adequately monitored by common thermocouple instrumentations. Therefore, in this study thermal fatigue evaluation of piping system Tee-connections is performed using the fluid-structure interaction (FSI) analysis. From the thermal hydraulic analysis, the temperature distributions are determined and their results are applied to the structural model of the piping system to determine the thermal stress. Using the rain-flow method the fatigue analysis is performed to generate fatigue usage factors. The procedure for improved load thermal fatigue assessment using FSI analysis shown in this study will supply valuable information for establishing a methodology on thermal fatigue.

A Development of FSI Analysis for Fuel Sloshing Noise Reduction

Jong-Suh Park,Seung Chan Choi 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5

Fuel sloshing noise is involved with flow motion inside fuel tanks as well as structural characteristics of vehicles. Therefore it is necessary to introduce Fluid-Structure Interaction (FSI) analysis to predict sloshing noise phenomena more accurately. Purposes of this paper are to verify the reliability of FSI analysis and suggest new analysis processes to predict fuel sloshing noise. The vibration of floor panels induced by sloshing impact is evaluated through FSI analysis. A series of tests is carried out to validate simulation results. The numerical optimization of parameters is also carried out to reduce computation time. In addition, effects of sloshing noise factors are discussed based on simulations results.