• Title/Summary/Keyword: 유체진동해석

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Post-Correlation Analysis for Shake Table Test of Square Liquid Storage Tank (정사각형 수조 진동대실험에 대한 상관해석)

  • Son, Il-Min;Kim, Jae-Min;Choi, Hyung-Suk;Baek, Eun-Rim
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.21 no.1
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    • pp.23-29
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    • 2017

  • In this study, a post-correlation analysis for shaking table test of square water storage tank is presented for the use of advances in earthquake-resistant design of liquid storage tank. For this purpose, the ANSYS CFX program is selected for the CFD analysis. Sensitivity analysis for resonant sloshing motion in terms of grid size and turbulence model suggested that (1) horizontal grid size as well as vertical grid size is a key variable in the sloshing analysis, and (2) the SST turbulence model is best for the sloshing analysis. Finally, correlation analyses for a non-resonant harmonic input and scaled earthquake excitation of the El Centro (1940) NS component are carried out using the grid and turbulence model established through the post-correlation analysis for the resonant motion. As a result, sloshing time histories by the CFD analysis agreed very well with the test results.

  • https://doi.org/10.11112/jksmi.2016.21.1.023 인용 PDF KSCI

Analysis of Fluid-Induced Vibration in the APR1400 Steam Generator Tube (신형경수로1400 증기발생기 전열관의 유체유발진동 해석)

  • 이광한;정대율;변성철
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2003.11a
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    • pp.84-91
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    • 2003

  • Flow-Induced Vibration of steam generator tubes may result in fretting wear damage at the tube-to-support locations. KSNP(Korean Standard Nuclear Power plant) steam generators experienced fretting wear in the upper part of U-bend above the central cavity region of steam generators. This region has conditions susceptible to the flow-induced vibration, such as high flow velocity, high void fraction, and longer unsupported span. To improve its performance, APR1400 steam generator is designed with additional supports in this region to reduce unsupported span and to reduce peak velocity in the central cavity region. In this paper, we examined its performance improvement using ATHOS code. The thermal-hydraulic condition in the region of secondary side of APR1400 steam generator is obtained using the ATHOS3 code. The effective mass for modal analysis is calculated using the void fraction, enthalpy, and operating pressure information from ATHOS3 code result. With the effective mass distribution along the tube, natural frequency and mode shape is obtained using ANSYS code. Finally, stability ratios and real mean squared displacements for selected tubes of the APR1400 steam generator are computed. From these results, the current design of the APR1400 steam generator are examined.

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DYNAMIC STALL ANALYSYS OF A MID-SIZED AIRCRAFT (중형항공기 동적 실속 특성 해석)

  • Lee, Yung-Gyo;Kim, Cheol-Wan;Ahn, Seok-Min
    • 한국전산유체공학회:학술대회논문집
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    • 2010.05a
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    • pp.37-39
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    • 2010

  • Aerodynamic analysis was done for a fuselage and wing configuration of a mid-sized aircraft using 3-dimensional Navier-Stokes solver. Various turbulent models including a transitional SST were implemented to observe a dynamic stall as well as cruise characteristics. Also, different mesh moving methods were evaluated. Flow hysteresis which causes dynamic stall was investigated through flow field investigations.

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유동 방향으로 나열된 두 실린더 사이의 간격에 따른 공력특성 분석

  • Lee, Jong-Yun;Kim, Jeong-Hun
    • Proceeding of EDISON Challenge
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    • 2016.03a
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    • pp.622-624
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    • 2016

  • 교량의 케이블이나 송전선같은 원형 구조물들은 유동의 불안정성에 의해 물체 후방에 Vortex가 발생한다. 이렇게 발생한 Vortex는 구조물에 진동과 소음을 발생시키게 된다. 본 연구에서는 이러한 원형 구조물들의 배열에 따른 해석을 진행하였다. 같은 크기의 두 원형 실린더를 주 유동 방향으로 정렬시킨 배열을 EDISON 전산열유체 시스템을 이용하여 해석하였다. 두 원형 실린더의 중심의 거리를 1.5 D부터 5 D까지 변화시켜가며 거리에 따른 각 실린더의 Drag coefficient에 초점을 맞추어 연구를 진행하였다. 두 원형 실린더 사이의 거리가 감소할수록 후류 쪽에 위치한 실린더의 Drag coefficient의 값이 감소하는 양상을 보였다.

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