Statistical simulation of reentry capsules in hypersonic near-continuum flows.

1. 제 목 : Statistical simulation of reentry capsules in hypersonic near-continuum flows.

2. 연 사 : Prof. Mikhail S. Ivanov (Novosibirsk State University)

3. 일 시 : 2006년 10월 21일 (토) 10:30 - 11:30

4. 장 소 : 서울대 신공학관(301동) 1층 세미나실

5. 내 용 :
Accurate prediction of force and heat aerodynamic characteristics of future and present reentry vehicles and spacecraft requires comprehensive investigation of hypersonic flows along the entire flight trajectory.
Recently, the part of CFD that studies rarefied flows in the transitional regime has drawn much attention, because a large portion of flight trajectory of modern space vehicles lies at high altitudes. Therefore, a new independent branch of CFD, namely, Rarefied Hypersonic Computational Fluid Dynamics, has been formed.
For modeling strongly nonequilibrium high-altitude hypersonic flows, the Boltzmann equation should be used. The DSMC method is a simulation technique most frequently used to obtain solutions of the Boltzmann equation. This method has become, de facto, the main tool for the study of complex multidimensional flows of rarefied hypersonic aerothermodynamics.
The application of the DSMC method has been limited mostly to altitudes between 300 and 80 km from the free-molecular regime to the near-continuum regime through the transitional regime. The main problem of the DSMC method it that it is extremely computationally expensive for near-continuum, three-dimensional flows.
The talk will include the results of investigation of high-altitude aerothermodynamics for two types of reentry capsules (Progress and Expert) and comparison of these results with available experiments. Three-dimensional parallel computations were performed for Knudsen numbers below 0.01 with real gas effects.

6. 약 력 :
Novosibirsk State University         Profesor    9/2002 - present
Novosibirsk Technical University     Profesor        9/1995 - 6/2002
Novosibirsk Technical University     Senior Lecturer 9/1983 - 6/1995
Head of Computational Aerodynamics Laboratory : Khristianovich Institute of Theoretical and
Applied Mechanics 12/1995 - present
Institute of Thermophysics, Novosibirsk, Russia Dr.Sci. in Mechanics of Fluids and Plasmas, 1993
Institute of Theoretical and Applied Mechanics, Novosibirsk, Russia Ph.D. in Fluid Mechanics, 1978

7. 문 의 : 기계항공공학부 김 종 암 교수 (☏ 880-1915)