archive-edu.com » EDU » R » RPI.EDU

Total: 920

Choose link from "Titles, links and description words view":

Or switch to "Titles and links view".
  • RPI SCOREC - Technical Reports
    the curved mesh adaptation along with the critical domains to achieve computational efficency This paper presents a procedure that combines Bezier mesh curving and size driven mesh adaptation technologies to address those requirements A moving mesh size field drives a curved mesh modifiction procedure to generate valid curved meshes that have been successfully analyzed by SLAC National Accelerator Laboratory researchers to simulate the short range wake fields in particle accelerators

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=523 (2015-07-15)
    Open archived version from archive


  • RPI SCOREC - Technical Reports
    an important issue in high performance computing In this work a part level mesh topological traversal algorithm is used to defne a reordering of both mesh vertices and regions that increases the spatial locality of data and improves overall cache utilization during on processor finite element calculations Examples based on adaptively created unstructured meshes are considered to demonstrate the effectiveness of the procedure in cases where the load per processing core is varied but balanced e g elements are equally distributed across cores for a given partition In one example the effect of the current ajacency based data reordering is studied for different phases of an implicit analysis including element data blocking element level computations sparse matrix filling and equation solution These results are compared to a case where reordering is applied to mesh vertices only The computations are performed on various supercomputers including IBM Blue Gene BG L and BG P Cray XT XT3 and XT5 and Sun Constellation Cluster It is observed that reordering improves the per core performance by up to 24 on Blue Gene L and up to 40 on Cray XT5 The CrayPat hardware performance tool is used to measure the number of cache misses

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=524 (2015-07-15)
    Open archived version from archive

  • RPI SCOREC - Technical Reports
    grids enables us to obtain a sharper interface that yields more accurate interfacial solutions The solution accuracy is compared with the existing interpolation functions such as the discretized Dirac delta function and the reproducing kernel interpolation function The finite element shape function is easy to implement and it naturally satisfies the reproducing condition They are interpolated through only one element layer instead of smearing to several elements A pressure jump

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=527 (2015-07-15)
    Open archived version from archive

  • RPI SCOREC - Technical Reports
    as intensity concentrating x ray optical elements Experiments and simulations have been carried out pulling Corning 7740 borosilicate glass rods in a cylindrical furnace Simulations were based on one dimensional and two dimensional finite difference element calculations assuming that deformation occurred by linear viscous flow and that the temperatures in the glass remained in equilibrium with the temperatures measured along the axis of the furnace Rates of elongation in experiments

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=534 (2015-07-15)
    Open archived version from archive

  • RPI SCOREC - Technical Reports
    a collection of displacement fields obtained during its relaxation We present two solutions for the inverse problem both developed using direct non iterative approach The first is a simple closed form approximate solution It depends upon the approximation that the interstitial pressure is spatially homogeneous The second solution relaxes this assumption It requires the solution of a Poisson equation to reconstruct the pressure distribution The inversion thus obtained is exact

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=541 (2015-07-15)
    Open archived version from archive

  • RPI SCOREC - Technical Reports
    the large eddy simulation of turbulent flows In this model the cross stresses are modeled by the RBVM term and the Reynolds stresses are represented by a Smagorinsky eddy viscosity The mixed model is motivated by an a priori analysis of a turbulent flow field that indicates that the RBVM term correctly models the dissipation induced by the cross stress term but underpredicts the contribution from the Reynolds stress term

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=542 (2015-07-15)
    Open archived version from archive

  • RPI SCOREC - Technical Reports
    Germano identity to the variational multiscale formulation Year 2010 Journal Communications in Numerical Methods in Engineering Volume Pages Abstract We examine the connection between the variational multiscale VMS formulation and the variational counterpart of the Germano identity VGI We note that they are both based on the same multiscale construct of a given coarse scale space and a user defined projector into this space which defines the desired numerical solution

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=543 (2015-07-15)
    Open archived version from archive

  • RPI SCOREC - Technical Reports
    in a channel flow based on DNS data Year 2010 Journal Computers and Fluids Volume 39 4 Pages 640 655 Abstract The development and assessment of spectral turbulence models require knowledge of the spectral turbulent kinetic energy distribution as well as an understanding of the terms which determine the energy distribution in physical and wave number space Direct numerical simulation DNS of turbulent channel flow yields numerical data that can

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=544 (2015-07-15)
    Open archived version from archive



  •