報(bào)告時(shí)間：2019年5月31日（周五）15:00-16:30
報(bào)告地點(diǎn)：北辰校區(qū)西教四土木與交通學(xué)院309會(huì)議室
報(bào)告題目：當(dāng)代計(jì)算方法在科學(xué)及工程中的應(yīng)用
報(bào)告嘉賓：徐輝
報(bào)告簡(jiǎn)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(jiǎn)介：
徐輝，英國(guó)帝國(guó)理工學(xué)院榮譽(yù)研究員、上海交通大學(xué)航空航天學(xué)院聘副教授（tenure track）。2009年獲西安交通大學(xué)博士學(xué)位，2010年至2018年間分別在巴黎第六大學(xué)和英國(guó)帝國(guó)理工學(xué)院從事博士后和研究員工作。徐輝博士長(zhǎng)期從事流體力學(xué)、應(yīng)用數(shù)學(xué)和計(jì)算數(shù)學(xué)交叉領(lǐng)域的相關(guān)理論與應(yīng)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(fā)人員；他將高精度hp型譜元方法首次應(yīng)用于重大工程需求中——設(shè)計(jì)新一代空客商用飛機(jī)機(jī)翼及羅伊斯?羅爾斯低噪聲大推力航空發(fā)動(dòng)機(jī)。2019 年之前，兼任羅伊斯?羅爾斯聲學(xué)部門研究員。擔(dān)任Journal of Hydrodynamics 編委。他的科研主要涉及湍流、層流-湍流轉(zhuǎn)捩、流動(dòng)控制、氣動(dòng)力學(xué)與氣動(dòng)聲學(xué)、高精度數(shù)值計(jì)算、動(dòng)力學(xué)理論等。他的科研工作與工程問題緊密結(jié)合，在理論與應(yīng)用方面同時(shí)開展工作。其科研論文主要發(fā)表在Journal of Fluid Mechanics、Journal of Computational Physics、SIAM Journal on Scientific Computing等國(guó)際著名雜志。
報(bào)告簡(jiǎn)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.
