报告人：Fehmi Cirak教授

Speaker:Dr. Fehmi Cirak

主持人：肖洪副教授

Host:Dr. Hong Xiao

时间：2017年12月27日（星期三）上午10:00-12:00

Time: 10:00am-12:00am, December 27, 2017

地点：长安校区动力与能源学院大楼225会议室

Place:Room225, School of Power and Energy

主题：浸入式B-Spline有限元

Topic: Immersed B-Spline Finite Elements

内容简介:

随着工业技术的进步,尤其是流固耦合、固体力学、计算机图形学、3D打印、结构重组等技术的发展，使得功能和复杂度越来越高的产品需要模拟、实验和加工制造。产品尺寸的模拟和设计跨越了米、厘米和亚毫米的范围。为了应对这些挑战，新的交互式计算工具不可或缺。基于此背景，我们提出了可扩展的浸入/嵌入边界有限元和DG理论，其在优化模型、流固耦合、固体力学等诸多领域表现出了强大的优势。与传统的有限元相比，浸入有限元不需要刻意生成和保持边界适应性网格,只需采用无边界适应的全局网格并结合计算机图形学辅助技术即可完成模拟。此外,该理论进一步推广将对计算流体力学、计算固体力学、计算机图形学、CAD等诸多计算模拟领域产生深远的影响。

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.

报告人简介

Fehmi Cirak,剑桥大学工程系教授。1988年至2001年先后学习于德国University of Stuttgart和美国加州理工学院，2001年至2006年先后工作于加州理工学院Center for Advanced Computing Research和Jet Propulsion Laboratory（喷气推进实验室），2006年加盟剑桥大学工程系先后任Lecture、Senior Lecture和Reader。Fehmi先后在《Science》等著名杂志上以第一作者身份发表论文多篇，并担任多个著名学术杂志副主编和编委。Fehmi首次将Subdivision Surface引入FEM， 是Isogeometric analysis概念提出的第一人，在计算机图形学、流固耦合、固体力学、结构力学等诸多领域做出了基础性的开创工作。

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.