中法核工程与技术学院第88期学术午餐会

中法核工程与技术学院第88期学术午餐会

88^th Academic Lunch Seminar of Sino-French Institute of Nuclear Engineering and Technology

Topic: Very fast solution of complex parametric systems with model order reduction methods

Speaker: Dr. ZHANG Chunyu

Time: 12:40 – 14:00, Friday September 28, 2018

Venue: F309 in the teaching building, Zhuhai Campus, SYSU

Organizer: Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University

Language: English

Abstract:

High-fidelity simulations by solving the governing partial differential equations (PDEs) are routinely used in nowadays scientific and engineering problems. However, the simulation is computationally expensive for large scale problems. Even for moderate scale problems, high-fidelity simulations are still challenging if the simulations have to be run many times (e.g., whole core neutron transport solution at different levels of burnup) or real-time (at least, very fast) simulations (e.g., prediction of the distribution of pollutants released in an accident) are necessary. The solution process must be accelerated to an acceptable level in the many-query context or the real time context. The most straightforward way to accelerate the computation is lowering the order of the model by various reduced order methods (ROMs). In the talk, two widely used model order reduction methods, i.e., the reduced basis finite element method (RB-FEM) and the POD-Galerkin projection method based on a finite volume approximation will be introduced. Typical applications in solving the neutron transport problem, the thermo-elastic problem as well as the flow problem will be demonstrated. Several orders of speedup are achieved while the accuracy is well preserved. Finally, challenges and prospects of ROMs will be discussed.

About the speaker:

Dr. ZHANG Chunyu (Ph.D., National University of Singapore; Bachelor, National University of defense technology), associate professor at IFCEN. Major research: computational mechanics, multiphysics modeling of complex systems, CAE software. More than twenty journal papers and one book have been published. Principal developer of ExPESS (extensible platform of engineering simulation software) which has been applied in nuclear engineering, electricity transport engineering and marine engineering. In 2014, issued with Guangdong Province Science and Technology Award for the contribution to the research and development of the key technologies of the 1000MW PWRs under severe accidents.