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  • RPI SCOREC - Technical Reports
    Year 2012 Journal Computer Methods in Applied Mechanics and Engineering Abstract The residual based variational multiscale formulation is applied to develop a large eddy simulation LES model for compressible flows In addition a mixed model in which a deviatoric Smagorinsky subgrid stress term is added to the RBVM terms to better model the Reynolds stresses is proposed These models along with the dynamic Smagorinsky Yoshizawa eddy diffusivity model are tested

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=574 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    components often a collagen fiber network surrounded by a non fibrillar matrix NFM In the present study a coupled fiber matrix model was developed to quantify fully the internal stress field within such a tissue and to explore interactions between the collagen fiber network and non fibrillar matrix NFM Voronoi tessellations representing collagen networks were embedded in a continuous three dimensional NFM Fibers were represented as one dimensional nonlinear springs and the NFM meshed via tetrahedra was modeled as a compressible neo Hookean solid Multi dimensional finite element modeling was employed to couple the two tissue components and uniaxial tension was applied to the composite RVE In terms of the overall RVE response average stress fiber orientation Poisson s ratio the coupled fiber matrix model yielded results consistent with those obtained using a previously developed parallel model based upon superposition The detailed stress field in the composite RVE demonstrated the high degree of inhomogeneity in NFM mechanics which cannot be addressed by a parallel model Distributions of maximum minimum principal stresses in the NFM showed a transition from fiber dominated to matrix dominated behavior as the matrix shear modulus increased The matrix dominated behavior also included a shift in the

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=575 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    throughput and decreasing cost of DRAM to provide an application transparent method for pre staging input data and commit results back to a persistent disk storage system The RSA is constructed from a set of individual RSA nodes each with large amounts of DRAM and a high speed connection to the storage network Memory from each node is made available through a dynamically constructed parallel filesystem to a compute job

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=576 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    minimum inter part communications A number of algorithms have been developed to meet these goals and graph hypergraph based methods are by far the most powerful ones However the global implementation of current approaches can fail on very large core counts and the vertex imbalance is not optimal where individual cores are lightly loaded Those issues are resolved by combination of global and local partitioning and an iterative improvement algorithm

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=581 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    with balanced work load and minimal communication As the adaptive meshes being generated reach billions of elements and the analyses are performed on massively parallel computers with 100 000 s of computing cores a number of complexities arise that need to be addressed This paper presents procedures developed to deal with two of them The first is a procedure to support multiple parts per processor which is used as the

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=582 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    Beall Title Parallel Curved Mesh Adaptation for Large Scale High order Finite Element Simulations Year 2012 Journal 21st International Meshing Roundtable Abstract This paper presents the development of a parallel adaptive mesh control procedure designed to operate with high order finite element analysis packages to enable large scale automated simulations on massively parallel computers The curved mesh adaptation procedure uses curved entity mesh modification operations Applications of the curved mesh

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=583 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    Abstract This paper describes a parallel procedure for anisotropic mesh adaptation with boundary layers for use in scalable CFD simulations The parallel mesh adaptation algorithm operates with local mesh modification operations developed for both unstructured and boundary layer parts of the mesh The adaptive approach maintains layered elements near the viscous walls and accounts for the mesh modification operations that are carried out in parallel on a distributed mesh In

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=584 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    to adapt the mesh to match that size field fully accounting for the actual geometry of curved domains while maintaining the semi structured nature of the elements in the boundary layers In the distributed environment it is crucial that during the mesh adaptation process all mesh entities communicating over part boundaries perform correct updates such that the complete mesh remains valid after its modification This thesis presents the infrastructure to support parallel mesh modification operations using both simple point to point data exchange and interaction with mesh migration which is an effective means for mesh cavity localization To increase the scalability of large scale simulations this work introduces a general purpose communication package built on top of MPI which is aimed at improving inter processor communications independently of the supercomputer architecture being considered The package is developed to support parallel applications that rely on computation characterized by a large number of messages of various sizes often small that are focused within processor neighborhoods The current package provides a utility for dynamic applications based on two key attributes i the explicit consideration of the neighborhood communication pattern to avoid many to many calls and to reduce the number of collective calls

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=585 (2015-07-15)
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