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2성분 비혼합성 유체의 계면 추적을 위한 격자 볼츠만 방법
이호영(Hoyoung Lee),김준호(Junho Kim),박영채(Yeongchae Park),정재욱(Peter Jeong) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
In this study, a lattice Boltzmann (LB) model based on the phase-field method is developed to efficiently track the interface between two immiscible fluids in two-component flows. The Cahn-Hilliard Equation (CHE) is solved using the D3Q7 LB model to enhance the efficiency of solving the order parameter, which distinguishes each fluid component. The Navier-Stokes Equations (NSE) are solved using the D3Q19 LB model to describe the flow field. Two benchmark cases of two-component immiscible flow, layered Poiseuille flow and Rayleigh-Taylor instability, were numerically solved to confirm the stability and accuracy of the model described in this study. The efficiency of this model was validated by tracking the interface at different viscosities.
2성분 비혼합성 유체의 계면 추적을 위한 격자 볼츠만 방법
이호영(Hoyoung Lee),김준호(Junho Kim),박영채(Yeongchae Park),정재욱(Peter Jeong) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
In this study, a lattice Boltzmann (LB) model based on the phase-field method is developed to efficiently track the interface between two immiscible fluids in two-component flows. The Cahn-Hilliard Equation (CHE) is solved using the D3Q7 LB model to enhance the efficiency of solving the order parameter, which distinguishes each fluid component. The Navier-Stokes Equations (NSE) are solved using the D3Q19 LB model to describe the flow field. Two benchmark cases of two-component immiscible flow, layered Poiseuille flow and Rayleigh-Taylor instability, were numerically solved to confirm the stability and accuracy of the model described in this study. The efficiency of this model was validated by tracking the interface at different viscosities.
효율적인 농도-확산 시뮬레이션을 위한 향상된 격자 볼츠만 방법
이호영(Hoyoung Lee),정재욱(Peter Jeong) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
In this study, we developed a numerical solver that performs concentration-diffusion simulation by efficiently coupling the two governing equations, Navier-Stokes Equations (NSE) and Convection-Diffusion Equation (CDE), based on the Lattice Boltzmann Method (LBM). The numerical method proposed in this study uses an advanced Regularized collision model to ensure high stability of the solver in simulations of extreme conditions such as low viscosity in the flow field and low diffusivity in the concentration field. Two benchmark problems for concentration-diffusion, Gaussian Hill and Doubly Periodic Shear Layer Flow, were solved to confirm the stability and accuracy of the proposed model. In addition, the developed solver is extended to three dimensions and concentration-diffusion simulations of multi-component are performed to demonstrate the robust performance and reliability of the numerical method in this study.
한국의 대 아프리카 외교의 동학과 대응방안 : 에너지·자원외교를 중심으로
이호영 (Hoyoung Lee) 고려대학교 일민국제관계연구원 2011 국제관계연구 Vol.16 No.2
아프리카에 대한 전 세계적인 관심이 증가되는 현 상황에서 미국을 필두로 중국, 일본, 인도가 적극적 대 아프리카 외교정책을 전개하고 있으며 뒤늦게나마 한국도 이 대열에의 참여를 모색하고 있다. 이것은 급등하는 국제유가와 불안정한 중동정세로 에너지 ? 자원의 안정적 확보 및 공급이 세계 각국의 국가적 과제로 대두되는 상황에서 아프리카가 그 대안으로 떠오른 것에 기인한다. 한국은 2006년 노무현 대통령의 아프리카 방문 이후 ‘아프리카 개발을 위한 한국 이니셔티브’를 발표하며 새로운 대 아프리카 외교정책을 전개하고 있다. 한국은 과거, 단기적인 실리 위주의 노선을 취한 결과로 인해 대 아프리카 외교가 별다른 실효성을 거두지 못했던 점을 고려하여, 보다 장기적 관점에서 상호이해를 증진시킬 수 있는 외교정책을 추진해야 할 것이다. 이에 본 연구는 아프리카가 전 세계적 에너지 ? 자원의 대안으로 부상하게 된 정치 ? 경제적 요인을 분석하고, 한국의 단기적 실리추구의 대 아프리카 외교정책의 정치과정 및 한계를 검토한 후, 미국과 중국의 대 아프리카 외교정책과의 비교를 통해 향후 한국의 에너지 ? 자원외교의 전략과 효율적 정책을 위한 대안을 제시하는 데 그 목적이 있다. In recent years, Africa has been at the center of many countries’ attention. Big countries, including the United States, Japan, China, and India, have paid special attention to the continent at a foreign policy level. Korea, as a late starter, has also shown an interest in building a close relationship with the African continent. Due to skyrocketing price of oil and political uncertainty in the Middle East in recent years, energy security issues, including securing energy sources and supply, are given the central and growing importance of every country in the world. In this situation, Africa is considered as a solution for the potential energy problems. Since the President Roh Moo-Hyun’s visit to Africa in 2006, South Korea has implemented a new style of foreign policy toward Africa based on ‘Korean Initiatives for Africa’s Development’. Korea’s new style foreign policy toward Africa is regarded as energy diplomacy. However, Korea’s energy diplomacy toward Africa has not been too effective. It is largely because Korea has approached Africa, only aiming to secure energy source by making little effort to strengthen the mutual understanding between South Korea and African countries with a long-term perspective. Diplomacy cannot succeed if one side is only interested in pursuing a short-term gain from the other side. Therefore, South Korea should develop a foreign policy toward Africa that promotes better understanding and cooperation between African countries and South Korea for the longer future. South Korea should not repeat the same mistakes. This paper looks into the changes in Korea’s diplomacy toward Africa in the historical context, paying special attention to the problems of both old and new forms of the diplomacy. Additionally, this paper also explores the reason why Africa has emerged as the area of interest for a number of countries in the world in recent years. The final focus of this paper is to examine an alternative approach for Korea’s successful diplomacy toward Africa.