1. 제 목 : Active and Passive Control for Drag Reduction





2. 연 사 : 최해천 교수


서울대학교 기계항공공학부





3. 일 시 : 2003년 10월 23일 (목) 16:00





4. 장 소 : 301동 101호





5. 요 약 : In this talk, the results from both numerical and experimental studies on active and passive controls for drag reduction are presented.First, we investigate the possibility of skin friction reduction by micro cavities and show that they can reduce the skin friction both in laminar and turbulent flows.Second, we consider the form drag reduction for flow over a bluff body. The bluff bodies considered are the circular cylinder, sphere and two-dimensional model vehicle. The control methods investigated are the suboptimal control, single frequency forcing, distributed forcing, and  control with a passive device.  It is shown that some of the control methods significantly reduce the form drag for various Reynolds numbers. Finally, optimal shape designs are conducted for three different flow problems: optimal diffuser shape, optimal micro channel shape, and optimal bluff body shape. The results of applying the optimal shape design technique will be presented.








6. 문의 : 송성진 교수(880-1667)





* 본 세미나는 제1회 젊은과학자상 수장자 연구실적 공개발표회로 진행됩니다.