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Chimera 격자기법을 이용한 자동차 주위의 유동장 해석
안민기,박원규,An, Min-Gi,Park, Won-Gyu 한국전산유체공학회 1998 한국전산유체공학회지 Vol.3 No.2
This paper describes the analysis of flow field around an automobile. The governing equations of the 3-D unsteady incompressible Navier-Stokes equations are solved by the iterative time marching scheme. The Chimera grid technique has been applied to efficiently simulate the flow around the side-view mirror. To validate the capability of simulating the flow around a ground vehicle, the flows around the Ahmed body with 12.5$^{\circ}$ and 30$^{\circ}$ of slant angles are simulated and good agreements with experiment and other numerical results are achieved. To validate Chimera grid technique, the flow field around a cylinder was also calculated. The computed results are also well agreed with other numerical results and experiment. After code validations, the flow phenomena around the ground vehicle are evidently shown. The flow around the side-view mirror is also well simulated using the Chimera grid technique.
Chimera 격자기법을 이용한 Car-like body 주위 유동장 및 공력소음 해석
안민기(M. K. Ahn),박원규(W. G. Park),홍성훈(S. H. Hong) 한국전산유체공학회 1998 한국전산유체공학회 학술대회논문집 Vol.1998 No.-
This paper describes the analysis of flow and aeroacoustic field around a car-like body. The governing equations, 3-D unsteady incompressible Navier-Stokes equations, are solved with the iterative time marching scheme. The Chimera grid technique has been<br/> converged, the aerodynamic noise analysis of the side-vlew mirror has been performed by solving Ffowcs Williams and Hawkings equation. From the present numerical simulation, the A- and C- pillar vortex are evidently shown and the aerodynmic noise level induced by the side-view mirror is predicted to about 100dB.
안민기(Minki An),구병문(Byeungmoon Ku),최강삼(Kangsam Choi) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
하이브리드 자동차는 일반 상용 차량 분야에서 오랫동안 연구한 결과, 현재 국내 시장에서 58만대를 넘어섰다. 이와 더불어 군에서도 가속성능 향상, 작전거리 증대, 저소음 등의 강점을 토대로 하이브리드 차량에 대한 연구를 지속해 오고 있다. 하지만 군용 하이브리드 차량의 경우 환경조건(온도, 전자파), 운행조건 등이 일반 상용 차량보다 요구되는 지수가 높으며 하이브리드 동력 시스템에 대한 기술 성숙도가 낮아 아직까지 전력화 되지 못하고 있다. 국내 뿐만 아니라 주요 국가(스웨덴, 영국, 미국)에서도 마찬가지로 전력화되지는 못하고 현재 실험실 수준의 테스트와 시제품을 만들어 실차 평가를 진행하는 수준에 머무르고 있다. 본 논문은 친환경적이며 미래 전장환경에서 기동장비의 핵심이 될 것으로 예상되는 군용 하이브리드차량에 대한 개발동향과 미래 전망에 대하여 제시하며 기술 성숙도 향상 및 전력화를 위하여 본 연구에 매진하고 있는 각 나라 별 개발동향에 대하여 분석하였다.
Chimera 격자기법을 이용한 자동차 주위의 유동장 해석
안민기(M. K. Ahn),박원규(W. G. Park) 한국전산유체공학회 1999 한국전산유체공학회지 Vol.3 No.2
This paper describes the analysis of flow field around an automobile. The governing equations of the 3-D unsteady incompressible Navier-Stokes equations are solved by the iterative th marching scheme. The Chimera grid technique has been applied to efficiently simulate the flow around the side-view mirror. To validate the capability of simulating the flow around a ground vehicle, the flows around the Ahmed body with 12.5˚ and 30˚ of slant angles are simulated and good agreements with experiment and other numerical results are achieved. To validate Chimera grid technique, the flow field around a cylinder was also calculated. The computed results are also well agreed with other numerical results and experiment. After code validations, the flow around an automobile has been simulated. The A-and C-pillar vortex and other flow phenomena around the ground vehicle are evidently shown. The flow around the side-view mirror is also well simulated using the Chimera grid technique.
Chimera 격자기법을 이용한 자동차 주위의 유동장 해석
안민기(M. K. Ahn),박원규(W. G. Park) 한국전산유체공학회 1999 한국전산유체공학회지 Vol.3 No.2
This paper describes the analysis of flow field around an automobile. The governing equations of the 3-D unsteady incompressible Navier-Stokes equations are solved by the iterative th marching scheme. The Chimera grid technique has been applied to efficiently simulate the flow around the side-view mirror. To validate the capability of simulating the flow around a ground vehicle, the flows around the Ahmed body with 12.5˚ and 30˚ of slant angles are simulated and good agreements with experiment and other numerical results are achieved. To validate Chimera grid technique, the flow field around a cylinder was also calculated. The computed results are also well agreed with other numerical results and experiment. After code validations, the flow around an automobile has been simulated. The A-and C-pillar vortex and other flow phenomena around the ground vehicle are evidently shown. The flow around the side-view mirror is also well simulated using the Chimera grid technique.