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[2016-08-08]
The Fifth Advanced Workshop on Turbulence Simulation
(Scene of the workshop)
On 30th and 31st July, 2016, the Laboratory for Advanced Simulation of Turbulence of Tsinghua University (LAST) and the State Key Laboratory for Turbulence and Complex Systems of Peking University (LTCS) held the fifth Advanced Workshop on Turbulence Simulation on the M floor in the William Mong Hall of the School of Aerospace Engineering of Tsinghua University. The conference invited a number of experts at home and abroad. They lectured on LES methods for numerical simulation of turbulent flow, RANS-LES hybrid methods, high-order numerical schemes and other aspects of the theory, methods and research progress and progress in experimental study of turbulence. About 150 students from Peking University, Tsinghua University, the Commercial Aircraft Company of China (COMAC), and other universities and research institutes attended the workshop. The workshop was held four times in the past. This is the first time that it is jointly sponsored by Peking University’s LTCS and Tsinghua University’s LAST.
Dr. Xiahui Peng, Director of the CFD and Turbulence Simulation Laboratory of FOI and Professor of KTH from Sweden, Professor Ning Qin of Sheffield University from UK, Professor Hong Luo of the University of Miami from USA, Professor Zhijian Wang of the University of Kansas from USA, Professor Gecheng Zha of University of Miami from USA, Professors Song Fu, Yuxin Ren, and Haitao Xu of Tsinghua University, and other Professors gave lectures. Both Professors Cunbiao Lee and Yipeng Shi from Peking University lectured in this workshop, too.
(Professor Cunbiao Lee gave a lecture)
On July 30th, Professor Cunbiao Lee from the State Key Laboratory for Turbulence and Complex Systems gave a speech entitled ‘Research Progress on Experiment of Hypersonic Boundary Layer Transition’. After discussing the importance of studying hypersonic aircraft and the transition of hypersonic boundary layer from the American Strategic Defense Map, Professor Lee firstly presented the domestic and overseas research progress on the receptivity of hypersonic boundary layer and its importance to the hypersonic boundary layer transition, and pointed out the lack of domestic research on it. He then introduced the research progress on the influence of roughness on hypersonic boundary layer transition. He also presented new flow visualization and measurement techniques to study hypersonic boundary layer transition developed by his group. With those experimental techniques, his group obtained the first complete flow map of hypersonic boundary layer transition, which filled a worldwide gap in this field. And the PIV measurement of velocity field near wall region solved the difficulty in velocity measurement near wall region for hypersonic boundary layer. Professor Lee lastly showed their newest research results, which demonstrated that the aerodynamic heating in hypersonic boundary layer transition was mainly reduced by the second mode wave in it. Also, in his lecture, Professor Lee shared his thoughts and experiences on scientific research with the students.
(Professor Yipeng Shi gave a lecture)
(A student asking questions during Professor Shi's lecture)
On July 31st, Professor Yipeng Shi from the State Key Laboratory for Turbulence and Complex Systems gave a speech entitled ‘Large Eddy Simulation of Turbulence in Engineering’. At first, Professor Shi introduced the basic ideas and methods of large eddy simulation (LES) in numerical simulation of turbulence and difficulties faced in the LES at present, and discussed the merits and shortcomings of the two approaches, constrained variational method and multi-scales method to improve LES. Then, he introduced the basic methodology and recent developments of Constrained Large Eddy Simulation (CLES) developed by his group based on the first approach, and showed the great advantages of CLES in simulating the more refined flow structure of incompressible and compressible flows by large computation examples, including the channel flow, flow over circular cylinder and flow over delta wing. Last, Professor Shi pointed out the possibility to simulating the flow in the aero-engine and shock-boundary layer interaction by CLES in the recent future. He also showed the computational refined flow structures of China-made large aircraft, C919 with CLES, which caused extensive attention and heated discussion among participants.
The workshop concluded successfully in the afternoon of the 31st of July.