報告人：Fehmi Cirak教授
Speaker:Dr. Fehmi Cirak
主持人：肖洪副教授
Host:Dr. Hong Xiao
時間：2017年12月27日（星期三）上午10:00-12:00
Time: 10:00am-12:00am, December 27, 2017
地點：長安校區動力與能源學院大樓225會議室
Place:Room225, School of Power and Energy
主題：浸入式B-Spline有限元
Topic: Immersed B-Spline Finite Elements
內容簡介:
隨著工業技術的進步,尤其是流固耦合、固體力學、計算機圖形學、3D打印、結構重組等技術的發展，使得功能和復雜度越來越高的產品需要模擬、實驗和加工制造。產品尺寸的模擬和設計跨越了米、厘米和亞毫米的范圍。為了應對這些挑戰，新的交互式計算工具不可或缺。基于此背景，我們提出了可擴展的浸入/嵌入邊界有限元和DG理論，其在優化模型、流固耦合、固體力學等諸多領域表現出了強大的優勢。與傳統的有限元相比，浸入有限元不需要刻意生成和保持邊界適應性網格,只需采用無邊界適應的全局網格并結合計算機圖形學輔助技術即可完成模擬。此外,該理論進一步推廣將對計算流體力學、計算固體力學、計算機圖形學、CAD等諸多計算模擬領域產生深遠的影響。
Introduction:
Advances in manufacturing, most prominently in additive manufacturing or fluid-structure interaction problems, are enabling the production of high-performance products with ever increasing functional and geometric complexity. Typically, the geometry features that can be designed reach from the product-scale in the order of tens of centimetres down to submillimetre scale. Novel interactive computational tools are indispensable to representing and exploring the corresponding vast design space. Against this backdrop, for the last several years we have been developing robust and scalable immersed/embedded boundary finite elements, which have clear advantages when applied to highly optimised geometrically complex parts. In contrast to conventional finite elements there is no need to generate and painstakingly maintain a boundary-fitted mesh. It is sufficient to have a non-boundary-fitted hexahedral voxel grid that is combined with auxiliary techniques for enforcing boundary conditions. Moreover, the voxel grid makes it possible to employ a host of multiresolution surface and volume representation techniques already available in computer graphics and computer-aided design.
報告人簡介
Fehmi Cirak,劍橋大學工程系教授。1988年至2001年先后學習于德國University of Stuttgart和美國加州理工學院，2001年至2006年先后工作于加州理工學院Center for Advanced Computing Research和Jet Propulsion Laboratory（噴氣推進實驗室），2006年加盟劍橋大學工程系先后任Lecture、Senior Lecture和Reader。Fehmi先后在《Science》等著名雜志上以第一作者身份發表論文多篇，并擔任多個著名學術雜志副主編和編委。Fehmi首次將Subdivision Surface引入FEM， 是Isogeometric analysis概念提出的第一人，在計算機圖形學、流固耦合、固體力學、結構力學等諸多領域做出了基礎性的開創工作。
Speaker’s Biography
Fehmi Cirakstudied at University of Stuttgart and then California Institute of Technology from 1988 to 2001, and worked atCenter for Advanced Computing ResearchandJet Propulsion LaboratoryinCaltechfrom 2001 to 2006.After that, hejoinedUniversity of Cambridge asLecture, Senior Lecture and then Readeruntil now. Fehmi has published a lot of papers as first author in many academicjournals, such as "Science", and served asassociate editorofmany famous academicJournals. Also, he wasknown as theintroduction ofSubdivision Surfaceinto FEM.
