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안희섭(Hee-Sub Ahn),손창현(Chang-Hyun Sohn),문수연(Su-Yeon Moon) 한국전산유체공학회 2000 한국전산유체공학회 학술대회논문집 Vol.2000 No.5
A well-known pressure correction method, a SIMPLE algorithm, is extended to treat compressible flows. Collocated grids are used and density is linked to pressure via an equation of state. The influence of pressure on density in the case of compressible flows is implicitly incorporated into the extended SIMPLE algorithm. The first-order Upwind and high-order Quick scheme are compared with respect to an accuracy and convergence time at all speeds. The extended method is verified on a number of test cases and the results are compared with other numerical results available in the literature. The calculated results show that the Quick scheme improves accuracy at all speed and also reduces the calculation time at supersonic flows, compared with the Upwind scheme.
CFD를 이용한 SF6 가스차단기의 SLF차단성능에 관한 수치적 연구
안희섭(Ahn Heui Sub),최종웅(Jongung Choi),박석원(Seokweon Park) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
A numerical model on the current interruption of SLF(Short Line Fault) is described in this paper. This modeling takes into account the turbulent effects and radiation of arc based on the LTE(Local Thermal Equilibrium) and LCE(Local Chemical Equibrium) assumptions. The arc conductivity and PAC(Post Arc Current) around the current zero is predicted and compared with test results.
안희섭(Hee-Sub Ahn),손창현(Chang-Hyun Sohn),문수연(Su-Yeon Moon) 한국전산유체공학회 2000 한국전산유체공학회지 Vol.5 No.2
A well-known pressure correction method, a SIMPLE algorithm, is extended to treat compressible flows. Collocated grids are used and density is linked to pressure via an equation of state. The influence of pressure on density in the case of compressible flows is implicitly incorporated into the extended SIMPLE algorithm. The first-order Upwind and high-order Quick scheme are compared with respect to an accuracy and convergence time at all speeds. The extended method is verified on a number of test cases and the results are compared with other numerical results available in the literature. The calculated results show that the Quick scheme improves accuracy at all speed and also reduces the calculation time at supersonic flows, compared with the Upwind scheme.
열-전ㆍ자계 연성해석을 이용한 초고압 모선부의 온도상승 해석
안희섭(Heui-Sub Ahn),윤정훈(Yoon Jeong Hoon),최종웅(Jongung Choi),오일성(I.S.Oh) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In development of High-voltage switchgear, proper thermal design becomes more and more important to provide safe function and reliability in spite of miniaturization and increasing performance demanded of modern devices. Due to the high complexity of heat generation and loss processes it is not easy to predict the thermal behavior of devices under various load conditions, i.e. usually numerous tests are required. To estimate the thermal performance of main bus, the 3D sequential coupled field thermal-magneto model was developed. The solution of the heat generation rate due to applied and eddy currents as well as skin and proximity effect is obtained using commercial electro-magnetic package. The solution for the fluid and temperature distribution is also obtained using commercial CFD package. The results of electromagnetic analysis are the inputs to the CFD analysis and vice versa until the steady state is reached. Temperature dependent material properties for both types of analyses are considered during the solution process. The predicted temperatures are quite well agreed with the experiments.