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탄성혈관 내 곡면형 이엽 기계식 인공심장판막의 거동 및 혈액 유동 특성에 관한 수치해석적 연구
방진석(J. S. Bang),최청렬(C. R. Choi),김창녕(C. N. Kim) 한국전산유체공학회 2004 한국전산유체공학회 학술대회논문집 Vol.2004 No.-
In this study, a numerical analysis has been performed for a three-dimensional pulsatile blood flow associated with the elastic blood vessel and curved bileaflet for multiple cycles in terms of fluid-structure interaction. Here, blood has been assumed as a Newtonian, incompressible fluid. Pressure profiles have been used as boundary conditions at the ventricle and the aorta. From this analysis, the motion of the leaflet has been observed with fluttering phenomenon and rebound, and the flow fields of blood have been obtained with recirculation and regurgitation. The results can contribute to the development of design methodology for the curved bileaflet mechanical heart valve.
Aligned Cusp 자장이 인가된 초크랄스키 실리콘 단결정 성장에서의 유동장에 대한 수치적 모사
김창녕,최청렬 경희대학교 산학협력기술연구원 1999 산학협력기술연구논문집 Vol.5 No.-
Characteristics of melt flow in Czochralski crystal growth of silicon have been simulated numerically under the influence of an aligned magnetic field. Since the silicon melt in a crucible for crystal growth is of high temperature and highly electrical-conducting, experimentation method has difficulty in analyzing the behavior of the melt flow Navier-Stokes and Maxwell equations have been used for the modeling of the melt flow which can be regarded as a liquid metal, and under-relaxation has been adopted In the calculation procedure of the set of simultaneous nonlinear equations. Together with the melt flow which forms the Marangoni convection that comes from the inside the flow field, a flow circulation is observed near the comer close both to the crucible wall and the free surface. In the flow field where magnetic field is not uniform, due the rotation of the crucible wall, differentiated centrifugal forces are exerted for different positions in the flow field, which yields the flow circulation. Also, the fact that the melt flow tends to follow the magnetic lines instead of traversing the lines helps the flow circulation exist.