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航空学院青年学术论坛第118讲
2018-10-17 09:10   审核人:

地点:航空楼A706

邀 请 人:钟诚文教授

报 告 人:韩国庆尚大学R.S.Myong教授

报告题目1:Boltzmann Gas Dynamics for Rarefied and Microscale Gases

时间:10月20日10:00-11:00

摘要:

A unified framework for rarefied and microscale (monatomic and polyatomic) gases and viscoelastic fluids based on the Boltzmann kinetic description is presented in this talk. The conventional description of gases is based on the two-century old first-order Navier-Stokes-Fourier constitutive laws. In order to overcome limitations of the first-order laws, the second-order algebraic nonlinear coupled constitutive laws are derived from the Boltzmann kinetic equation via the new closing-last balanced closure.

The holistic second-order non-Navier non-Fourier constitutive lawsare then validated using the atomic-level molecular dynamics simulation for the viscous stress and heat flux calculated directly from the molecular data via the Irving-Kirkwood procedure.

In addition, the new second-order laws, in conjunction with a mixed modal discontinuous Galerkin method, are applied to several challenging problems; shock structure, nanoscale Poiseuille flow, shock-vortex interaction, and rarefied hypersonic flow. Lastly, the new non-classical laws are extended to a multi-phase flow in order to investigate the rocket plume-lunar surface interaction and regolith particle dispersal in rarefied dusty gas flow in Lunar landing.

(Also check Indian GIAN Lecture on “Rarefied & Microscale Gases and Viscoelastic Fluids: A Unified Framework”, 2017, IIT Kanpur, https://www.youtube.com/)

报告题目2:Recent Progress in Aircraft In-flight Icing and Certification

时间:10月20日11:00-12:00

摘要:

The Research Center for Aircraft Core Technology (ACTRC) was founded in 2017 with the aim to attack directly the crux of unsolved problems in safety-related core systems of aircraft. The ACTRC envisions, in particular, the development of the critical linchpin technology like aircraft in-flight icing and certification upon which the aircraft industry will hinge. In this talk, recent progress in understanding of aerodynamic and propulsive effects of in-flight icing on fixed-wing aircraft and rotorcraft is described.

As the first example, ice accretion on the surface of an electro-thermal anti-icing system around a rotorcraft engine air intake was investigated on the basis of computational and experimental methods. It was shown that the general shape and range of ice accretion predicted by CFD calculations are in close agreement with experimental data obtained by an icing wind tunnel.

Also, using new unified CFD solvers--all of which are based on a single unstructured upwind finite volume framework--of clean air, large droplet impingement, ice accretion, and the aerodynamic analysis of ice effects, ice accretion and aerodynamic effects on a multi-element airfoil were investigated under the recently introduced Appendix O icing envelope.

报告人简介:

R. S. Myong(明魯信)

Professor, Department of Aerospace and Software Engineering, Gyeongsang National University,

Jinju, South Korea (1999-Present, http://acml.gnu.ac.kr/)

Director, Research Center for Aircraft Core Technology (ACTRC), Jinju, South Korea (2017-Present)

Guest Professor, Northwestern Polytechnical University, Xian, China (2014-Present)

Research Associate, NASA Goddard Space Flight Center, US (1997-1999)

Ph.D. in Aerospace Engineering, University of Michigan, US (1996)

M.S. & B.S. in Aeronautical Engineering, Seoul National University, South Korea (1989, 1987)

Chairman, 32nd International Symposium on Rarefied Gas Dynamics in 2020, Seoul, South Korea

Associate Editor, Advances in Aerodynamics, CARDC, China (2018-Present)

Associate Editor, Communications in Computational Physics, UK (2010-2016)

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