• 한국전산유체공학회:학술대회논문집
• /
• 한국전산유체공학회 2010년 춘계학술대회논문집
• /
• pp.71-77
• /
• 2010

As a hybrid model of continuum motion description which combines the advantages of classical kinematical descriptions i.e. Lagrangian and Eulerian description, the ALE (Arbitrary Lagrangian Eulerian) description is adopted for the simulation of a fluid-structure interaction of solid propellant rocket interior. The fluid-structure interaction phenomenon with the deformation of solid domain during the simulation. The developed solver is applied flow and propellant structure. The computed results show complex flow physics in the combustion chamber and the behavior of a solid propellant deformation.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2010년도 추계학술대회 논문집
• /
• pp.817-818
• /
• 2010

• 설비공학논문집
• /
• 제17권7호
• /
• pp.642-648
• /
• 2005

This study has been conducted to investigate the thermopneumatic and flow characteristics of diffuser/nozzle based thermopneumatic micropumps. In this study, a transient three-dimensional numerical analysis using FSI (Fluid-Structure Interaction) model has been employed to analyze the effects of the interaction between the membrane and two fluids (air and water) in the thermopneumtic micropump. The transient temperature and pressure in the cavity, the transient displacements of the membrane and the net flow rate of the micropump have been closely calculated for the frequency of 1 Hz. It has been found that the difference of the flow rates at the inlet and outlet is larger in the cooling period than in the heating period and that the duty ratio is very important in association with pump performance because the temperature in the cavity ascends drastically in the heating period and descends slowly in the cooling period. This study can be regarded as fundamental understandings for the design and analysis of thermopneumatic micropumps.

• 설비공학논문집
• /
• 제17권1호
• /
• pp.33-38
• /
• 2005

This study has been conducted to investigate flow characteristics of a micropump with piezoelectric materials. In this study, the change of flow rates has been investigated for different positions of the inlet and outlet and for different distances between them. The FSI(Fluid Structure Interaction) method has been employed for numerical analysis of the piezoelectric diffuser/nozzle based micropump. It has been found that time averaged flow rate is greater in the case that distance between the inlet and outlet is longer. For the cases where the positions of the inlet are different with the position of the fixed outlet at the center, the flow rate is increased as the inlet is located farther from the center. This study may supply fundamental understandings for the design and analysis of the prototypes of piezoelectric micropumps.

• 한국정밀공학회지
• /
• 제25권5호
• /
• pp.112-120
• /
• 2008

This study has been conducted to investigate the characteristics of flow field and discharge valve motion in a rotary compressor. In this study, a transient three-dimensional numerical analysis using FSI(Fluid-Structure Interaction) model has been employed to analyze the interaction between the discharge valve and the refrigerants in the rotary compressor. It has been observed that two peaks have appeared in the displacement of the discharge valve. The maximum displacement of the discharge valve has been found to be located at the second peak. Also, the input pressure of the refrigerants has been compared with the pressures of the muffler passage and the compressor outlet in the rotary compressor. The pressure has decreased along the pathway in the rotary compressor. And the volume flow rates obtained from the current numerical study have been compared with the experiment at data to verify the validity of the present numerical study. This study may supply the fundamental data for the design of rotary compressors.

• 대한기계학회논문집A
• /
• 제38권6호
• /
• pp.601-608
• /
• 2014

해양플랜트는 고립된 한경 특성상 화재에 취약하다. 특히 해양플랜트의 주요 기자재인 소화용 감압 밸브가 피해를 입었을 때 해양플랜트의 피해는 증가한다. 본 논문에서는 해양플랜트에 사용되는 소화용 감압밸브에 대한 화재 안전시험을 수행하고 그 결과를 수치해석 결과와 비교, 분석하여 해석의 타당성을 증명하고 화재 안전시험에 대한 해석 기법을 제시하였다. 화재 안전시험의 화염을 구현하기 위해 FSI를 이용하였으며 화재 안전시험의 온도 분포와 해석 결과 온도분포의 비교를 통해 해석 기법의 신뢰성을 확인하였다. 또한, 화재 안전시험에서 나타난 문제점을 구조해석을 통해 검증하였으며 그 결과 시트의 변형이 문제점으로 나타났다.

• 한국항공우주학회지
• /
• 제39권7호
• /
• pp.652-659
• /
• 2011

항공기 IR(Infrared; 적외선) 피탐지성 감소 연구를 위해 후방동체 주위 열유동장과 IR 신호를 예측하는 시스템을 구축하였다. 아음속 무인전투기(UCAV)를 대상 항공기로 고려하여 가상 임무 설정 및 성능해석을 통해 가상 엔진을 선정하였다. 또한 각 임무를 만족시키는 노즐을 설계한 후, 고속 고온 열유동장 CFD 해석코드를 이용하여 최대 출력에서의 노즐 내부 유동을 해석하였다. 예측된 노즐 표면 및 후방 동체의 온도는 고체표면 복사 열교환 및 신호 예측코드와 연계시키는 시스템과 연동시켜 최종적으로 IR 신호를 계산하였다. IR 밴드 및 관찰 각도에 대한 IR 신호의 변화를 분석하여 IR 감소설계를 위한 정성적 정보를 도출하였다.