Department News
Modeling of some fundamental aspects of particulate flows as applied to
Seminar Date
2000-10-19
Author
손문숙
Date
2000-10-19
Views
1005
1. 제 목 : Modeling of some fundamental aspects of particulate flows as applied to
advanced simulation of solid rockets.
2. 연 사 : Professor S. Balachandar
Department of Theoretical & Applied Mechanics
University of Illinois, Urbana-Champaign, USA
3. 일 시 : 9월 7일 (목) 11시-11시50분
4. 장 소 : 301동 1512호
5.내 용
This talk will outline some of the fundamental research activities in particulate/droplet flow modeling that are on-going at the Center for Simulation of Advanced Rockets. Modern rocket propellants are alluminized, which results in the ejection of Aluminum droplets of few hundred microns in size into the rocket core flow. The Al droplets burn and their product of combustion, aluminum oxide, forms predominantly as micron size smoke particles. Thus, in the context of solid rockets a range of particulate size is encountered. The smoke particles are small in size and therefore an Eulerian description is appropriate. Whereas the Al droplets are
sufficiently large that they require a Lagrangian approach. Two different efforts are will be highlighted in this talk. The first effort address Eulerian modeling of two-phase flows with small particles (such as the oxide smoke) which can be treated as a continuum. Here we have developed a novel Fast Eulerian methodology which eliminates many of the problems encountered in the standard Eulerian treatment of particulate flows. The strengths and limitations of the fast Eulerian methodology will be discussed. The second effort addresses fundamental improvement to Lagrangian motion of large particles (such as the Al droplets) in unsteady nonuniform flows. In this context direct numerical simulations of flow and heat transfer over an isolated particle/ droplet is performed in the Reynolds number range 10 to 500, in order to better understand the influence of both unsteadiness and flow non-uniformity on forces and thermal transfer from the droplet. A general force law for particle motion which accounts for arbitrary linear variation in the surrounding flow is proposed. Time permitting corresponding results for heat/mass transfer will also be discussed.
5. 문 의 : 기계항공공학부 최해천 교수 (☏ : 880-8361)
advanced simulation of solid rockets.
2. 연 사 : Professor S. Balachandar
Department of Theoretical & Applied Mechanics
University of Illinois, Urbana-Champaign, USA
3. 일 시 : 9월 7일 (목) 11시-11시50분
4. 장 소 : 301동 1512호
5.내 용
This talk will outline some of the fundamental research activities in particulate/droplet flow modeling that are on-going at the Center for Simulation of Advanced Rockets. Modern rocket propellants are alluminized, which results in the ejection of Aluminum droplets of few hundred microns in size into the rocket core flow. The Al droplets burn and their product of combustion, aluminum oxide, forms predominantly as micron size smoke particles. Thus, in the context of solid rockets a range of particulate size is encountered. The smoke particles are small in size and therefore an Eulerian description is appropriate. Whereas the Al droplets are
sufficiently large that they require a Lagrangian approach. Two different efforts are will be highlighted in this talk. The first effort address Eulerian modeling of two-phase flows with small particles (such as the oxide smoke) which can be treated as a continuum. Here we have developed a novel Fast Eulerian methodology which eliminates many of the problems encountered in the standard Eulerian treatment of particulate flows. The strengths and limitations of the fast Eulerian methodology will be discussed. The second effort addresses fundamental improvement to Lagrangian motion of large particles (such as the Al droplets) in unsteady nonuniform flows. In this context direct numerical simulations of flow and heat transfer over an isolated particle/ droplet is performed in the Reynolds number range 10 to 500, in order to better understand the influence of both unsteadiness and flow non-uniformity on forces and thermal transfer from the droplet. A general force law for particle motion which accounts for arbitrary linear variation in the surrounding flow is proposed. Time permitting corresponding results for heat/mass transfer will also be discussed.
5. 문 의 : 기계항공공학부 최해천 교수 (☏ : 880-8361)
