From mgu at math.berkeley.edu Tue Mar 1 00:25:27 2011 From: mgu at math.berkeley.edu (Ming Gu) Date: Tue Mar 1 00:29:40 2011 Subject: [BANANA] Reminder: No seminar on March 2, 2011 In-Reply-To: References: <201102180908.p1I98kOb007119@phoenix.math.berkeley.edu> Message-ID: Due to the SIAM CSE meeting in Reno this week, there will be no seminar on March 2, 2011. We resume with a talk by Prof. Per-Olof Persson of UC Berkeley on March 9, 2011, entitled: High-Order Discontinuous Galerkin Simulation of Flapping wings Designed for Energetically Optimal Flight All the best, Ming From mgu at math.berkeley.edu Fri Mar 4 01:41:01 2011 From: mgu at math.berkeley.edu (Ming Gu) Date: Fri Mar 4 01:45:26 2011 Subject: [BANANA] LAPACK seminar on March 9, 2011 Message-ID: <201103040941.p249f1Wd001009@panda.math.berkeley.edu> Math 290, Section 29, CS 298, Section 6, Spring 2011 (Matrix Computations and Scientific Computing) We meet WEDNESDAYS 11:10 - noon in Room 380 Soda Hall, Berkeley campus. The coordinators are Profs. J. Demmel (demmel@cs.berkeley.edu) and M. Gu (mgu@math.berkeley.edu). The program will be a mixture of research talks and tutorials. The tutorials will provide a partial sequel to Math 221. For the schedule and other details about the seminar, please see math.berkeley.edu/~mgu/LAPACKSeminar.htm Date: March 9, 2011 Speaker: Per-Olof Persson, UC Berkeley Title: High-Order Discontinuous Galerkin Simulation of Flapping Wings Designed for Energetically Optimal Flight Abstract: The numerical simulation of flapping flight is a challenging problem, partly because of the large deformations of the computational domain, the transitional flows, and the complex geometries. We present our recent results with high-order accurate discontinuous Galerkin methods, which are capable of accurately solving complex flow problems on unstructured meshes. We generate tetrahedral meshes using the DistMesh mesh generator and the Delaunay refinement method. A nonlinear elasticity analogy is used both for curving the elements to align with the boundaries and for deforming the mesh due to the moving domains, which are modeled by a mapping-based high-order accurate Arbitrary Lagrangian-Eulerian formulation. The equations are discretized using the Compact DG method, and solved efficiently in parallel using Newton-Krylov solvers and optimized element ordering. We demonstrate our solvers in the setting of a multi-fidelity framework for inverse design of flapping wings. A panel method-wake only energetics solver is used to define the energetically optimal wing shapes and flapping kinematics. Candidate designs are then simulated using our high-order solvers, to gain insight into practical wing designs, the influence of viscous effects, and when faster low-fidelity simulation tools can be sufficiently accurate. Date: March 16 Speaker: Florian Hecht, UC Berkeley From saunders at stanford.edu Mon Mar 7 14:53:08 2011 From: saunders at stanford.edu (Michael Saunders) Date: Mon Mar 7 14:55:01 2011 Subject: [BANANA] LA/Opt seminar Thursday March 10 (Jim Lambers) Message-ID: Linear Algebra and Optimization Seminar (CME 510) ICME, Stanford University http://icme.stanford.edu/seminars/seminars.php 4:15pm Thursday March 10, 2011 Y2E2 101 http://campus-map.stanford.edu/index.cfm?ID=04-070 Prof James Lambers Dept of Mathematics, University of Southern Mississippi James.Lambers@usm.edu http://www.math.usm.edu/lambers/ Solution of time-dependent PDEs through component-wise approximation of matrix functions Block Krylov subspace spectral (KSS) methods are a "best of both worlds" compromise between explicit and implicit time-stepping methods for variable-coefficient PDEs, in that they combine the efficiency of explicit methods and the stability of implicit methods, while also achieving spectral accuracy in space and high-order accuracy in time. Block KSS methods compute each Fourier coefficient of the solution using techniques developed by Gene Golub and Gerard Meurant for approximating elements of functions of matrices by block Gaussian quadrature in the spectral, rather than physical, domain. This talk highlights the superiority of block KSS methods, in terms of accuracy and efficiency, to other Krylov subspace methods in the literature. It also describes how the ideas behind block KSS methods can be applied to a variety of equations, including problems for which Fourier spectral methods are not normally feasible. In particular, the versatility of the approach behind block KSS methods is demonstrated through application to nonlinear diffusion equations for signal and image processing, and adaptation to finite element methods and meshless methods. The talk will also serve as a partial preview of an upcoming short course that I will offer during the last three weeks of Spring Quarter: CME 335, Advanced Topics in Numerical Linear Algebra. This is the last seminar for Winter 2011 From mgu at math.berkeley.edu Mon Mar 7 22:21:59 2011 From: mgu at math.berkeley.edu (Ming Gu) Date: Mon Mar 7 22:26:17 2011 Subject: [BANANA] Reminder: LAPACK seminar on March 9, 2011 In-Reply-To: <5399_1299231920_p249jGic010304_201103040941.p249f1Wd001009@panda.math.berkeley.edu> References: <5399_1299231920_p249jGic010304_201103040941.p249f1Wd001009@panda.math.berkeley.edu> Message-ID: Math 290, Section 29, CS 298, Section 6, Spring 2011 (Matrix Computations and Scientific Computing) We meet WEDNESDAYS 11:10 - noon in Room 380 Soda Hall, Berkeley campus. The coordinators are Profs. J. Demmel (demmel@cs.berkeley.edu) and M. Gu (mgu@math.berkeley.edu). The program will be a mixture of research talks and tutorials. The tutorials will provide a partial sequel to Math 221. For the schedule and other details about the seminar, please see math.berkeley.edu/~mgu/LAPACKSeminar.htm Date: March 9, 2011 Speaker: Per-Olof Persson, UC Berkeley Title: High-Order Discontinuous Galerkin Simulation of Flapping Wings Designed for Energetically Optimal Flight Date: March 16, 2011 Speaker: Florian Hecht, UC Berkeley From mgu at math.berkeley.edu Wed Mar 9 23:25:36 2011 From: mgu at math.berkeley.edu (Ming Gu) Date: Wed Mar 9 23:29:53 2011 Subject: [BANANA] LAPACK seminar on March 16, 2011 Message-ID: <201103100725.p2A7Pa9C031470@panda.math.berkeley.edu> Math 290, Section 29, CS 298, Section 6, Spring 2011 (Matrix Computations and Scientific Computing) We meet WEDNESDAYS 11:10 - noon in Room 380 Soda Hall, Berkeley campus. The coordinators are Profs. J. Demmel (demmel@cs.berkeley.edu) and M. Gu (mgu@math.berkeley.edu). The program will be a mixture of research talks and tutorials. The tutorials will provide a partial sequel to Math 221. Note that there will be no seminar on March 23 thanks to Spring Break. For the schedule and other details about the seminar, please see math.berkeley.edu/~mgu/LAPACKSeminar.htm Date: March 16, 2011 Speaker: Florian Hecht Title: Updated Sparse Cholesky Factors for Co-Rotational Elastodynamics Abstract: I will present work was that recently submitted to SIGGRAPH on "Updated Sparse Cholesky Factors for Co-Rotational Elastodynamics". We have developed a way to incrementally update the Cholesky factor of a sparse matrix for the simulation of elastic materials. Instead of updating the complete factor, we can do partial updates at a small and controllable sacrifice in accuracy. With these updates we can simulate objects faster than with a traditional Conjugate Gradient (CG) iterative solver. Furthermore with a direct Cholesky solver we make our solution times independent of material parameters and mesh quality. Our method also scales better for larger meshes than CG. I will explain in detail how efficient sparse direct solvers work and how we can use the same structures to do partial updates. I will also show the modifications to the base co-rotational method for elastodynamics that make this update scheme possible. Our factorization, solve and update routines are parallelized and I will talk about difficulties to achieve high performance on many cores. From mgu at math.berkeley.edu Tue Mar 15 00:20:32 2011 From: mgu at math.berkeley.edu (Ming Gu) Date: Tue Mar 15 01:12:24 2011 Subject: [BANANA] Reminder: LAPACK seminar on March 16, 2011 In-Reply-To: <26910_1299742188_p2A7TiQE028892_201103100725.p2A7Pa9C031470@panda.math.berkeley.edu> References: <26910_1299742188_p2A7TiQE028892_201103100725.p2A7Pa9C031470@panda.math.berkeley.edu> Message-ID: Math 290, Section 29, CS 298, Section 6, Spring 2011 (Matrix Computations and Scientific Computing) We meet WEDNESDAYS 11:10 - noon in Room 380 Soda Hall, Berkeley campus. The coordinators are Profs. J. Demmel (demmel@cs.berkeley.edu) and M. Gu (mgu@math.berkeley.edu). The program will be a mixture of research talks and tutorials. The tutorials will provide a partial sequel to Math 221. Note that there will be no seminar on March 23 thanks to Spring Break. For the schedule and other details about the seminar, please see math.berkeley.edu/~mgu/LAPACKSeminar.htm Date: March 16, 2011 Speaker: Florian Hecht Title: Updated Sparse Cholesky Factors for Co-Rotational Elastodynamics From mgu at math.berkeley.edu Thu Mar 17 19:45:10 2011 From: mgu at math.berkeley.edu (Ming Gu) Date: Thu Mar 17 20:18:39 2011 Subject: [BANANA] LAPACK Seminar: No meeting on March 23, 2011 In-Reply-To: <12140_1299565573_p286Q9Sf028981_alpine.LRH.2.02.1103072220320.5658@panda.math.berkeley.edu> References: <5399_1299231920_p249jGic010304_201103040941.p249f1Wd001009@panda.math.berkeley.edu> <12140_1299565573_p286Q9Sf028981_alpine.LRH.2.02.1103072220320.5658@panda.math.berkeley.edu> Message-ID: Hi everyone, Next week is Spring Break, and there will be no meeting on March 23. On March 30, we will resume our seminar with the second part of a tutorial on vector and matrix norms by Prof. William Kahan. Have a great Spring Break. Ming From mgu at math.berkeley.edu Fri Mar 25 22:31:42 2011 From: mgu at math.berkeley.edu (Ming Gu) Date: Fri Mar 25 22:35:56 2011 Subject: [BANANA] LAPACK seminar on March 30, 2011 Message-ID: <201103260531.p2Q5VgNf013814@panda.math.berkeley.edu> Math 290, Section 29, CS 298, Section 6, Spring 2011 (Matrix Computations and Scientific Computing) We meet WEDNESDAYS 11:10 - noon in Room 380 Soda Hall, Berkeley campus. The coordinators are Profs. J. Demmel (demmel@cs.berkeley.edu) and M. Gu (mgu@math.berkeley.edu). The program will be a mixture of research talks and tutorials. The tutorials will provide a partial sequel to Math 221. For the schedule and other details about the seminar, please see math.berkeley.edu/~mgu/LAPACKSeminar.htm Date: March 30, 2011 Speaker: Prof. W. Kahan Title: A Tutorial Overview of Vector and Matrix Norms Abstract: This tutorial is to be posted on Prof. Kahan's web page , q.v. Intended for new graduate students whose experience as undergraduates may have prepared them inadequately to apply norms to numerical error-analyses and to proofs of convergence, this tutorial surveys norms for finite-dimensional real spaces in a way that may ease a transition to the infinite-dimensional spaces of Functional Analysis. Among the overview's topics are some more useful than implied by their absence from most curricula. Parts I & II of the overview were presented last Fall semester and should be reviewed in preparation for parts III etc. And opportunities for questions will be offered. Date: April 6, 2011 Speaker: Artem Napov, LBNL From mgu at math.berkeley.edu Sat Mar 26 18:30:10 2011 From: mgu at math.berkeley.edu (Ming Gu) Date: Sat Mar 26 18:34:24 2011 Subject: [BANANA] Bay Area Scientific Computing (BASC) on May 8 at Stanford Message-ID: ---------- Forwarded message ---------- Date: Fri, 25 Mar 2011 13:14:00 -0700 (PDT) From: "margot.gerritsen@stanford.edu" Subject: Bay Area Scientific Computing (BASC) on May 8 at Stanford Dear all, The Bay Area Scientific Computing Day will this year be held at Stanford's Institute for Computational and Mathematical Engineering on May 8 (Sunday). BASCD is an annual informal gathering to encourage the interaction and collaboration of researchers in the fields of scientific computing and computational science/engineering from the San Francisco Bay Area. This event provides a great venue for junior researchers to present their work to the local community, and for the Bay Area scientific and computational science/engineering communities at large to interchange views on today's multidisciplinary computational challenges and state-of-the-art developments. The event will feature presentations by researchers from institutions in the San Francisco Bay Area. The final program will be published mid April, but several of the talks that will be held are listed below. There will also be opportunity for poster presentations. The day is free and open to all, but we do ask you to register in advance. Registration is now open at http://icme.stanford.edu/DeptEvents/BASC.html If you would like to present a poster, please send an email with authors and title of the poster to Margot Gerritsen, margot.gerritsen@stanford.edu A sample of featured talks: Jeff Connor, Lawrence-Livermore National Laboratory, ?Calculating Numerical Errors in a Quantity of Interest Using Nonlinear Algorithms Applied to Linear Advection Jeremy Templeton, Sandia National Laboratory Atomistic-to-Continuum Modeling for Multiscale and Multiphysics Computations." Yuji Nakatsukasa, UC Davis Arithmetic and communication minimizing algorithms for the symmetric eigendecomposition and the SVD Irina Kalashnikova, Stanford University The discontinuous enrichment method for advection-dominated transport phenomena in computational fluid dynamics. Margot Gerritsen Director, Institute for Computational & Mathematical Engineering, Associate Professor, Department of Energy Resources Engineering, Stanford University Mailing address: Huang Engineering Center 475 Via Ortega Room M10 Stanford, CA 94305 Work phone: 650-725-2727 or 650-725-3542 margot.gerritsen@stanford.edu http://margot.stanford.edu, http://smartenergyshow.wordpress.com twitter: @smartenergyshow From mgu at math.berkeley.edu Mon Mar 28 13:49:24 2011 From: mgu at math.berkeley.edu (Ming Gu) Date: Mon Mar 28 14:22:54 2011 Subject: [BANANA] Reminder: LAPACK seminar on March 30, 2011 In-Reply-To: <201103260531.p2Q5VgNf013814@panda.math.berkeley.edu> References: <201103260531.p2Q5VgNf013814@panda.math.berkeley.edu> Message-ID: Math 290, Section 29, CS 298, Section 6, Spring 2011 (Matrix Computations and Scientific Computing) We meet WEDNESDAYS 11:10 - noon in Room 380 Soda Hall, Berkeley campus. The coordinators are Profs. J. Demmel (demmel@cs.berkeley.edu) and M. Gu (mgu@math.berkeley.edu). The program will be a mixture of research talks and tutorials. The tutorials will provide a partial sequel to Math 221. For the schedule and other details about the seminar, please see math.berkeley.edu/~mgu/LAPACKSeminar.htm Date: March 30, 2011 Speaker: Prof. W. Kahan Title: A Tutorial Overview of Vector and Matrix Norms Date: April 6, 2011 Speaker: Artem Napov, LBNL Title: An algebraic multigrid method with guranteed convergence rate From saunders at stanford.edu Tue Mar 29 19:29:42 2011 From: saunders at stanford.edu (Michael Saunders) Date: Tue Mar 29 19:31:31 2011 Subject: [BANANA] LA/Opt seminars for Spring 2011 Message-ID: Dear Linear Algebra and Optimization colleagues, Here's the Spring schedule for our CME 510 seminars at Stanford. Thursdays 4:15pm in the same room as before (Y2E2 Rm 101). http://icme/seminars/seminarInfo.php?seminar_id=2 Blank means no seminar. Thu Mar 31 Thu Apr 07 Thu Apr 14 Laurent El Ghaoui EECS, Berkeley Thu Apr 21 Thu Apr 28 Parvis Moin ME, Stanford Thu May 05 Nicole Taheri ICME Thu May 12 Andrew Spann ICME Thu May 19 Aravindakshan Babu ICME Thu May 26 Mike Lesnick ICME The last 5 talks are SCREAM Seminars organized by the SIAM Stanford Student Chapter: http://www.stanford.edu/group/siam/events.html The talk titles are on both websites.