Department News
A Lecture on Numerical Simulation of Turbulent Heat/Flow using DNS & LES techniques
Seminar Date
2005-11-23
Author
빈종훈
Date
2005-11-23
Views
1865
1. 제 목 : A Lecture on Numerical Simulation of Turbulent
Heat/Flow using DNS & LES techniques
2. 연 사 : 나 양
3. 일 시 : 2005년 11월 23일 오후4시
4. 장 소 : 서울대 301동 306호
5. 내 용 :
In our daily life, we are experiencing many problems directly related to turbulence. To an engineer, the prediction of turbulence is a challenge: rates of mixing and of transfer of mass, heat and momentum are much larger than in steady viscous ("laminar") flow. To an experimentalist, turbulence is a fascinating but incredibly complicated consequence of Newton''s law of motion. To supercomputer manufacturers, it is a perpetual source of income !?
Direct numerical simulation (DNS) is restricted to a relatively low Reynolds number because of the need to resolve all the spatial scales of turbulence. In large eddy simulation (LES), on the other hand, only the dynamics of the larger-scale motions (which are not universal) are computed explicitly while the effects of small scales or subgrid-scales (which have, to some extent, a universal character) are represented by simple models. Thus, the critical issue in LES is to accurately capture the effects of the unresolved subgrid-scale (SGS) motions using simple and universal models.
In this lecture, the introduction on the DNS and LES methodologies will be given to the students and then, the issue of temperature prediction will be discussed using the data from the DNS & LES of a turbulent channel with wall injection in terms of accuracy, cost and a range of applicability.
6. 약 력 :
2000-현재 건국대학교 기계항공공학부 조교수
1996-1999 Postdoctoral Research Associate, University of Illinois at Urbana- Champaign
1996 Ph. D, Mechanical Engineering, Stanford University
1989 M.S. Mechanical Engineering, Seoul National University
1987 B.S. Mechanical Engineering, Seoul National University
7. 문 의 : 기계항공공학부 여 재 익 (☏ 880-9334)
Heat/Flow using DNS & LES techniques
2. 연 사 : 나 양
3. 일 시 : 2005년 11월 23일 오후4시
4. 장 소 : 서울대 301동 306호
5. 내 용 :
In our daily life, we are experiencing many problems directly related to turbulence. To an engineer, the prediction of turbulence is a challenge: rates of mixing and of transfer of mass, heat and momentum are much larger than in steady viscous ("laminar") flow. To an experimentalist, turbulence is a fascinating but incredibly complicated consequence of Newton''s law of motion. To supercomputer manufacturers, it is a perpetual source of income !?
Direct numerical simulation (DNS) is restricted to a relatively low Reynolds number because of the need to resolve all the spatial scales of turbulence. In large eddy simulation (LES), on the other hand, only the dynamics of the larger-scale motions (which are not universal) are computed explicitly while the effects of small scales or subgrid-scales (which have, to some extent, a universal character) are represented by simple models. Thus, the critical issue in LES is to accurately capture the effects of the unresolved subgrid-scale (SGS) motions using simple and universal models.
In this lecture, the introduction on the DNS and LES methodologies will be given to the students and then, the issue of temperature prediction will be discussed using the data from the DNS & LES of a turbulent channel with wall injection in terms of accuracy, cost and a range of applicability.
6. 약 력 :
2000-현재 건국대학교 기계항공공학부 조교수
1996-1999 Postdoctoral Research Associate, University of Illinois at Urbana- Champaign
1996 Ph. D, Mechanical Engineering, Stanford University
1989 M.S. Mechanical Engineering, Seoul National University
1987 B.S. Mechanical Engineering, Seoul National University
7. 문 의 : 기계항공공학부 여 재 익 (☏ 880-9334)
