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學術報告:當代計算方法在科學及工程中的應用

  報告時間:2019年5月31日(周五)15:00-16:30

  報告地點:北辰校區西教四土木與交通學院309會議室

  報告題目:當代計算方法在科學及工程中的應用

  報告嘉賓:徐輝

 

  報告簡介

  In this talk, we discuss two kinds of methods: spectral/hp element methods and lattice Boltzmann method and focus on their industrial applications. Firstly, we introduce the spectral/hp element methods in transition. Maintaining laminar flow is of increasing interest on modern aircraft as evidenced by the Boeing’s Dreamliner. Although laminar-turbulent transition in boundary layers has been a fundamental topic of aerodynamics research for a number of decades its modelling is challenging due the low level of noise required to capture and propagate the flow instabilities which are at the heart of transition. Using high fidelity modelling based around spectral/hp element framework we have undertaken a joint computational/experimental comparison of the instability caused by a small surface indentation at a Chord Reynolds number of approximately 1M. We have also explored the roles of two-dimensional indentations and protrusions and smooth forward-facing steps. The ability to use these tools in more complex geometric configuration may well open up the possibility for broader application of passive lamina flow control. Secondly, a brief introduction about lattice Boltzmann method in complex flow simulations is given with some applications. The capability of lattice Boltzmann method in turbulence and aeroacoustics will be discussed. Finally, we make a conclusion about these two methods with some perspectives.

 

  嘉賓簡介

  徐輝,英國帝國理工學院榮譽研究員、上海交通大學航空航天學院聘副教授(tenure track)。2009年獲西安交通大學博士學位,2010年至2018年間分別在巴黎第六大學和英國帝國理工學院從事博士后和研究員工作。徐輝博士長期從事流體力學、應用數學和計算數學交叉領域的相關理論與應用研究。他是hp 型譜元法開源軟件Nektar++的不可壓縮及可壓縮求解器的核心開發人員;他將高精度hp型譜元方法首次應用于重大工程需求中——設計新一代空客商用飛機機翼及羅伊斯?羅爾斯低噪聲大推力航空發動機。2019 年之前,兼任羅伊斯?羅爾斯聲學部門研究員。擔任Journal of Hydrodynamics 編委。他的科研主要涉及湍流、層流-湍流轉捩、流動控制、氣動力學與氣動聲學、高精度數值計算、動力學理論等。他的科研工作與工程問題緊密結合,在理論與應用方面同時開展工作。其科研論文主要發表在Journal of Fluid Mechanics、Journal of Computational Physics、SIAM Journal on Scientific Computing等國際著名雜志。

  

  報告簡介

  In this talk, we discuss two kinds of methods: spectral/hp element methods and lattice Boltzmann method and focus on their industrial applications. Firstly, we introduce the spectral/hp element methods in transition. Maintaining laminar flow is of increasing interest on modern aircraft as evidenced by the Boeing’s Dreamliner. Although laminar-turbulent transition in boundary layers has been a fundamental topic of aerodynamics research for a number of decades its modelling is challenging due the low level of noise required to capture and propagate the flow instabilities which are at the heart of transition. Using high fidelity modelling based around spectral/hp element framework we have undertaken a joint computational/experimental comparison of the instability caused by a small surface indentation at a Chord Reynolds number of approximately 1M. We have also explored the roles of two-dimensional indentations and protrusions and smooth forward-facing steps. The ability to use these tools in more complex geometric configuration may well open up the possibility for broader application of passive lamina flow control. Secondly, a brief introduction about lattice Boltzmann method in complex flow simulations is given with some applications. The capability of lattice Boltzmann method in turbulence and aeroacoustics will be discussed. Finally, we make a conclusion about these two methods with some perspectives.

 

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