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Кафедра гидромеханики МГУ:
-= Совместный московско-пекинский математический онлайн-коллоквиум =-
* Lecture 1 - Tying Knots in Fluids
Speaker: Prof. Yue Yang, Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing
Time: 2020-06-26 20:00-21:00 Beijing time (15:00-16:00 Moscow time)
Abstract
We develop a general method for constructing knotted vortex/magnetic tubes with the finite thickness, arbitrary shape, and tunable twist. The central axis of the knotted tubes is determined by a given smooth and non-degenerated parametric equation. The helicity of the knotted tubes can be explicitly decomposed into the writhe, localized torsion, and intrinsic twist. We construct several knotted vortex/magnetic tubes with various geometry and topology, and investigate the effect of twist on their evolution in hydrodynamic or magnetohydrodynamic flows using direct numerical simulation. In addition, we illustrate a knot cascade of magnetic field lines through the stepwise reconnection of a pair of orthogonal helical flux tubes with opposite chirality.
* Lecture 2 - Supercomputer simulations of aerodynamics and aeroacoustics problems using high-accuracy schemes on unstructured meshes
Speaker: Prof. Andrey Gorobets, Keldysh Institute of Applied Mathematics of RAS, Moscow
Time: 2020-06-26 21:00-22:00 Beijing time (16:00-17:00 Moscow time)
Abstract
This talk is devoted to scale-resolving simulations of compressible turbulent flows using edge-based high-accuracy methods on unstructured mixed-element meshes. The focus is on parallel computing. Firstly, the family of edge-based schemes that we are developing will be outlined. Then our simulation code NOISEtte will be presented. It has multilevel MPI+OpenMP+OpenCL parallelization for a wide range of hybrid supercomputer architectures. A description of the parallel algorithm will be provided. Finally, our supercomputer simulations of aerodynamics and aeroacoustics problems will be demonstrated.
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Вход в zoom-конференцию:
https://zoom.com.cn/j/68534857318?pwd=MmFGQU9KMjkvUHNOWmQ2RWxzRGN5QT09Meeting ID: 685 3485 7318
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Подробная информация:
http://english.math.pku.edu.cn/conferences/242.html— Ссылка:
Beijing-Moscow Mathematics Colloquium (online) - School of Mathematical Sciences, Peking University