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Deflagration to detonation transition (DDT) is a very important research project for both national defence and energy industry. It is the process where a subsonic deflagration transits into a supersonic detonation, which generates shock waves. In the past years, the simulations of DDT were limited in a small domain, usually several cubic centimeters. If we want to simulate it in a larger space without improving the numerical method, we need to use the more powerful computer. When the computing resources are limited, we must improve the numerical method to achieve the big-domain simulating. There are two technical paths, one is the adaptive mesh refinement and the other is the large eddy simulation. Both of them are difficult to realize. In this project, we focus on the usage of the LES method for simulating DDT. The main challenge in this work is to develop a reliable model. In this research, a new approach for LES modelling was developed. It is a fully compressible variant of the artificial thickened flame model, which adopts the opting functions on the reference flame thickness. This method ensures that the flame is not over-thickened in deflagration or detonation. To control the options on the flame thickness, a detonation sensor is utilized during the computing.

报告人简介：

Dr. Shaoxi Yu Has finished his Ph.D. research at Imperial College London recently. He received his M.S. (2009) at Huazhong University of Science and Technology. At Imperial College London, he obtained M.Sc. (2011) and Ph.D. (2015) in the Department of Mechanical Engineering. His broader interests of research include the large eddy simulation of high speed combustion, parallel programming with FORTRAN and unstructured mesh generation. His main research fruit is creating a fully parallelized code, which is able to simulate deflagration to detonation transition with the-state-of-the-art LES technique. He was also invited to present his research in The Proceedings of the Combustion Institute and The International Colloquium on the Dynamics of Explosions and Reactive Systems. His current research is simulating supersonic combustion in unstructured mesh using high performance computing (HPC).

题目二：火焰加速、爆燃转爆轰及爆轰稳定性的研究

报告人韩文虎助理研究员
中科院工程热物理研究所
时间：2016年1月5日（周二）下午3:00－4:00
地点：澳门太阳娱乐网站官网1#楼209（暂定）

报告内容摘要：

可燃气体火焰加速、爆燃转爆轰机理研究是工业爆炸灾害和爆轰推进领域急需解决的科学问题，由于该过程对化学反应动力学参数、粘性、热扩散和物质扩散效应十分敏感，使得爆燃转爆轰全过程的研究变得非常复杂和困难。本研究通过高精度大规模并行程序对层流火焰加速、爆轰转爆轰及爆轰稳定性进行计算。报告主要研究宏、微观尺度下爆燃转爆轰机理，以及粘性在爆燃转爆轰全过程中的影响机制；进一步研究约束、曲率对爆轰稳定性的影响，建立传播不稳定与横向不稳定之间的耦合关联。

报告人简介：

韩文虎，中科院工程热物理研究所助理研究员。2013年7月于北京理工大学获博士学位；2013年9月-2015年9月于清华大学燃烧能源中心博士后流动；2015年9月-现今被聘为中科院工程热物理研究所助理研究员。主要研究方向包括爆燃转爆轰、爆轰稳定性，及基于详细、简化反应机理爆轰稳定性的高精度计算。部分研究成果发表于 Combustion and Flame, Physics of Fluids等期刊。

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