• Title/Summary/Keyword: Multiphysics

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A study on the bipolar plate of electrolytic cell of hydrogen gas generation system by numerical system (수소가스발생 장치의 전해조의 분리판에 관한 전사모사 연구)

  • Jo, Hyeon-Hak;Lee, Sang-Ho;Jang, Bong-Jae;Song, Ju-Yeong
    • Journal of the Korean Applied Science and Technology
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    • v.27 no.1
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    • pp.61-69
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    • 2010
  • This study is focused on the modeling of two phase fluid flow system in the electrode of hydrogen gas generator. The characteristics of hydrogen gas generation was studied in view of efficiency of hydrogen gas generation rate and a tendency of gas flow through the riv of electrode. Since the flow rate of generated gas is the most crucial in determining the efficiency of hydrogen gas generator, we adopted the commercial analytical program of COMSOL $Multiphysics^{TM}$ to calculate the theoretical flow rate of hydrogen gas from the outlet of gas generator.

CFD/CAE Analysis of QC/DC Bellows for LNG Bunkering (LNG 벙커링용 QC/DC 밸로즈의 유동/구조 해석)

  • Jang, Sung-Cheol;Eom, Jeong-Pil;Jung, Hyun-Cheol
    • Journal of the Korean Society of Industry Convergence
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    • v.21 no.5
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    • pp.191-195
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    • 2018
  • By using an ANSYS product suite (CFX, Ansys Multiphysics), which is a powerful tool for multiphysics analysis of complicated physical phenomena, we performed a structural stress analysis based on fluid flow and heat transfer phenomena within a quick connect/disconnect (QC/DC) bellows system. Considering the extremely low temperatures in the QC/DC environment, an approach to the problem based on complex multi-physics phenomena, where different phenomena interact with each other, is crucial. Therefore, we use a numerical analysis technique where fluid-thermal-structural interactions are combined. In conclusion, when low temperature fluids flow inside bellows, the expected service life is conspicuously reduced due to the thermal stress caused by heat transfer. Therefore, in future research, a structure with considerably reduced thermal stress by robust design optimization will be derived.

A study on the channel design of bipolar plate of electrolytic cell of hydrogen gas generation system by flow dynamic simulation (수소가스발생 장치의 전해조 분라판의 유로설계에 관한 전산모사 연구)

  • Jo, Hyeon-Hak;Jang, Bong-Jae;Song, Ju-Yeong
    • Journal of the Korean Applied Science and Technology
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    • v.27 no.2
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    • pp.152-156
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    • 2010
  • This study is focused on the channel design of bipolar plate in the electrode of hydrogen gas generator. The characteristics of hydrogen gas generation was studied in view of efficiency of hydrogen gas generation rate and a tendency of gas flow through the riv design of electrode. Since the flow rate of generated gas is the most crucial in determining the efficiency of hydrogen gas generator, we adopted the commercial analytical program of COMSOL $Multiphysics^{TM}$ to calculate the theoretical flow rate of hydrogen gas from the outlet of gas generator.

다물리 해석을 위한 고려사항과 소프트웨어 개발 현황

  • Lee, Jae-Yeon
    • Journal of the KSME
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    • v.54 no.6
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    • pp.41-45
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    • 2014
  • 이 글에서는 다물리(Multiphysics) 전산해석에 고려되어야 하는 사항들을 표현하고, 이를 위해 개발되어온 소프트웨어의 개발 현황을, 연성해석 분야에서 널리 사용되고 있는 COMSOL Multiphysics를 중심으로 소개하고자 한다.

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멀티피직스 시스템 해석과 구조 최적 설계

  • Yun, Gil-Ho
    • Journal of the KSME
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    • v.49 no.6
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    • pp.34-38
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    • 2009
  • 이 글에서는 최근 학계와 산업계의 관심이 집중되고 있는 멀티피직스 시스템(Multiphysics System)의 해석 방법과 이를 이용한 구조최적설계(Structural Optimization) 기법의 응용과 최신 기법에 대해서 소개하고자 한다.

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BOTANI: High-fidelity multiphysics model for boron chemistry in CRUD deposits

  • Seo, Seungjin;Park, Byunggi;Kim, Sung Joong;Shin, Ho Cheol;Lee, Seo Jeong;Lee, Minho;Choi, Sungyeol
    • Nuclear Engineering and Technology
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    • v.53 no.5
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    • pp.1676-1685
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    • 2021
  • We develop a new high-fidelity multiphysics model to simulate boron chemistry in the porous Chalk River Unidentified Deposit (CRUD) deposits. Heat transfer, capillary flow, solute transport, and chemical reactions are fully coupled. The evaporation of coolant in the deposits is included in governing equations modified by the volume-averaged assumption of wick boiling. The axial offset anomaly (AOA) of the Seabrook nuclear power plant is simulated. The new model reasonably predicts the distributions of temperature, pressure, velocity, volumetric boiling heat density, and chemical concentrations. In the thicker CRUD regions, 60% of the total heat is removed by evaporative heat transfer, causing boron species accumulation. The new model successfully shows the quantitative effect of coolant evaporation on the local distributions of boron. The total amount of boron in the CRUD layer increases by a factor of 1.21 when an evaporation-driven increase of soluble and precipitated boron concentrations is reflected. In addition, the concentrations of B(OH)3 and LiBO2 are estimated according to various conditions such as different CRUD thickness and porosity. At the end of the cycle in the AOA case, the total mass of boron incorporated in CRUD deposits of a reference single fuel rod is estimated to be about 0.5 mg.

3D modeling of a surface acoustic wave for wireless sensors (무선 센서용 표면탄성파의 3 차원 모델링)

  • Cuong, Tran Ngoc;Chung, Gwiy-Sang
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.111-111
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    • 2009
  • In this work, we discuss simulation of surface acoustic wave device using Comsol Multiphysics. The structure SAW device based on piezoelectric thin film aluminum-nitride (AlN) on silicon was simulated. Some parameters of SAW device such as surface velocity, displacement of piezoelectric thin film were evaluated by software. Many modes and shapes of wave are also discussed in this paper. For evaluation physical parameters of AlN piezoelectric layer, the SAW resonator was modeled and simulation results were also compared with experiment results. we simulated arid evaluated the surface Rayleigh wave of AlN thin film on silicon substrate. Results simulation and experiment showed the surface velocity of AlN thin film was about 5200 m/s and shape of surface wave was also displayed. This paper has also proposed as method to study SAW characteristic of piezoelectric thin film and found out measurement values accurately of film such as stiffness matrix, piezoelectric matrix. These values are very important in calculation and design SAW device or MEMS device based on AlN piezoelectric layer.

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