其他
【预告】广东省计算数学学会2020年会
为了推动广东省计算科学的发展,加强计算科学人才的培养,促进计算科学研究人员之间的交流与合作,广东省计算数学学会、广东省高性能计算学会、广东省计算科学重点实验室定于2020年12月19日至20日举办“广东省计算数学学会2020年会”。
会议日程
特邀报告嘉宾
01
主 题:A Coupled Multi-Physics Model and a Decoupled Stabilized Finite Element Method for Closed- Loop Geothermal System主讲人:何晓明单 位:美国密苏里科学技术大学报告摘要
We propose and analyze a new coupled multi-physics model and a decoupled stabilized finite element method for the closed-loop geothermal system, which mainly consists of a network of underground heat exchange pipelines to extract the geothermal heat from the geothermal reservoir. The new mathematical model considers the heat transfer between two different flow regions, namely the porous media flow in the geothermal reservoir and the free flow in the pipes. Darcy's law and Navier-Stokes equations are considered to govern the flows in these two regions, respectively, while the heat equation is coupled with the flow equations to describe the heat transfer in both regions. Furthermore, on the interface between the two regions, four physically valid interface conditions are considered to describe the continuity of the temperature and the heat flux as well as the no-fluid-communication feature of the closed-loop geothermal system. In the variational formulation, an interface stabilization term with a penalty parameter is added to overcome the difficulty of the possible numerical instability arising from the interface conditions in the finite element discretization. To solve the proposed model accurately and efficiently, we develop a stabilized decoupled finite element method which decouples not only the two flow regions but also the heat field and the flow field in each region. The stability of the proposed method is proved. Numerical experiments are provided to demonstrate the applicability of the proposed model and the accuracy of the numerical method.
报告人介绍
02
主 题:偏微分方程反问题高性能计算方法研究与交叉学科中的典型应用主讲人:衡益单 位:中山大学报告摘要
求解不适定反问题是科学与工程领域的普遍需求。当前,新型不适定反问题(譬如观测数据多维瞬态、真实解具有特殊的性质或者不同的尺度等)普遍多耦合、计算规模巨大,亟需我们研发新的计算方法。报告人基于天河二号超算系统进行大规模偏微分方程反问题求解方面的算法研究,开展应用与计算数学、超级计算、化学工程、工程热物理以及环境与大气科学等交叉学科领域的研究和应用。主要汇报内容:核心数学问题与共性研究、池沸腾强化传热机理研究及应用、反渗透淡化组件优化设计、大气污染物动态源项识别及输送模拟等方向进展,以及在此基础上基于模型的实验分析及优化设计、多物理场仿真工业计算软件开发等科研探索。
报告人介绍
03
主 题:计算流体力学的时空观:模型的时空关联性及算法的时空耦合性 主讲人:李杰权单 位:北京应用物理与计算数学研究所报告摘要
报告人介绍
04
主 题:A Hermite WENO Method with Modified Ghost Fluid Method for Compressible Two-Medium Flow Problems主讲人:邱建贤单 位:厦门大学报告摘要
In this presentation, we present a novel approach by combining a new robust finite difference Hermite weighted essentially non-oscillatory (HWENO) method with the modified ghost fluid method (MGFM) to simulate the compressible two-medium flow problems. The main idea is that we first use the technique of the MGFM to transform a two-medium flow problem to two single-medium cases by defining the ghost fluids status based on the predicted interface status. Then the efficient and robust HWENO finite difference method is applied for solving the single-medium flow cases. By using immediate neighbor information to deal with both the solution and its derivatives, the fifth order finite difference HWENO scheme adopted in this paper is more compact and has higher resolution than the classical fifth order finite difference WENO scheme of Jiang and Shu. Furthermore, by combing the HWENO scheme with the MGFM to simulate the two-medium flow problems, less ghost point information is needed than that in using the classical WENO scheme in order to obtain the same numerical accuracy. Various onedimensional and two-dimensional two-medium flow problems are solved to illustrate the good performances of the proposed method.
报告人介绍
邱建贤,厦门大学数学科学学院教授,博士生导师,闽江学者特聘教授,国际著名刊物J. Comp. Phys. (计算物理) 编委。从事计算流体力学及微分方程数值解法的研究工作,在间断Galerkin (DG) 、加权本质无振荡 (WENO) 数值方法的研究及其应用方面取得了一些重要成果,已发表论文一百多篇,主持国家自然科学基金重点项目和联合基金重点支持项目各一项,参与欧盟第六框架特别研究项目,是项目组中唯一非欧盟的成员,多次被邀请在国际会议上作大会报告。
05
主 题:A Nonnested Augmented Subspace Method for Eigenvalue Problem主讲人:谢和虎单 位:中国科学院数学与系统科学研究院报告摘要
In this talk, we will introduce a type of nonnested augmented subspace for solving eigenvalue problems with curve interface. Based on the nonnested augmented subspace, a type of nonnested multilevel correction method can also be designed for the eigenvalue problems. The augmented subspace can transform the high dimensional eigenvalue problem solving into the solution of the linear boundary value problem and small scale eigenvalue problem solving. Since there is no high dimensional eigenvalue problem solving, the augmented subspace method improves the overfull efficiency for solving the eigenvalue problems. In this talk, we will introduce the method, the corresponding analysis and some numerical tests.
报告人介绍
06
主 题:Phase Retrieval for Sparse Signals主讲人:许志强单 位:中国科学院数学与系统科学研究院报告摘要
Phase retrieval is active topic recently. The aim of this talk is to introduce our work on phase retrieval for sparse signals. Particularly, we build up the theoretical framework for the recovery of sparse signals from the magnitude of the measurement. We show that one can employ L1 minimization to stably recover 𝑘-sparse signals from 𝑚 ≤ 𝑂(𝑘log 𝑛/𝑘) Gaussian random quadratic measurements with high probability. This is a joint work with V. Voroninski, Y. Wang and Y. Xia.
报告人介绍
07
主 题:增强现实 (AR) : AI+3D+5G时代的下一个爆点主讲人:姚剑单 位:武汉大学报告摘要
人工智能 (AI) 在一维(文本、语音)和二维(图片、视频)上都有较为成熟的技术和应用,在三维 (3D) 上的技术当前和未来研究的重点。AI 赋能3D技术,加上5G通讯高速率、低延时的加持,以及巨大的市场规模和移动端带有3D传感器的消费级产品的规模化应用,使得增强现实引发了学术界、工业界的关注和资本的热捧,可以预见,增强现实 (AR) 将成为AI+3D+5G时代的下一个爆点,必将引爆全新的社交、商业和娱乐模式。AR技术具有一定技术门槛。3D内容(AR物件)的生产依托于CG技术或难度更高的三维重建技术(SFM+MVS、三维扫描重建),3D内容与现实场景的交互则依托于定位与建图技术、3D Mesh重建技术、智能识别(平面检测、目标识别、手势识别)技术。虽然当前AR算法仍面临鲁棒性、速度和动态场景的挑战,但越来越多的研究者和业界公司投入了AR算法研究,致力于研发To B和To C的AR平台、产品、App,可以预见,增强现实 (AR) 将以全新的交互模式提供更优化、智能的生活体验,必将引爆全新的生活方式。
报告人介绍
姚剑,武汉大学教授,博士生导师,中组部第4批国家重大人才工程青年学者入选者,湖北省“楚天学者”特聘教授,武汉大学遥感信息工程学院学科带头人,武汉大学3D大数据人工智能创新研究中心主任。近年来,在国际权威期刊和CVPR, ECCV, ICRA, IROS等国际顶级学术会议上发表论文130余篇,申请国家发明专利70余项,授权国家发明专利30余项,实用新型专利授权10余项,软件著作权授权10余项。自加盟武汉大学即创建成立计算机视觉与遥感实验室。目前主要研究方向包括计算机视觉、人工智能、智能机器人、3D技术等。
08
主 题:Convergence and Optimality of Adaptive Modified Weak Galerkin Method for Second Order Elliptic Problem主讲人:钟柳强单 位:华南师范大学报告摘要
The convergence and optimality of adaptive modified weak Galerkin(AMWG) method for second order elliptic problem is considered. Under the assumption of a penalty parameter, by using reliability of error estimator, comparison of solutions and reduction of error estimator, the sum of the energy error and the scaled error estimator, between two consecutive adaptive loops, is proved to be a contraction, namely AMWG is convergent. Furthermore, the geometric decay and the equivalence of classes are instrumental in deriving the optimal cardinality of the AMWG. Numerical experiments are implemented to support the theoretical results.
报告人介绍
编辑:王茹茹
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