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  • RPI SCOREC - Technical Reports
    with elementary defects of the regular network are fully characterized Each type of defect is represented by a superposition of singular point sources in 2D elastostatics producing a field identical to the eigenstrain of the respective defect The amplitude of the point sources is determined by probing the eigenstrain with a series of path independent integrals This spectral decomposition represents the generalization that allows applying methods developed to account for

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=501 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    polymeric and biological materials These systems deform non affinely i e the local deformation is different than the applied far field The degree of non affinity increases with decreasing scale of observation Here we show that this relationship is a power law with a scaling exponent independent of the type of applied load Preferential fiber orientation influences non affinity in a significant way this parameter generally increases upon increasing orientation

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=502 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    those obstacles resolved our method demonstrates its capabilities with strong scalability on large scale supercomputers and its ability to solve problems of interest requiring numerically intensive computations in a reasonable time frame The performance of our implicit solver is improved by two algorithms developed in this work The rst algorithm multiple compute object based partition improvement incrementally improves the load balance hence the scalability of both the equation formation and the equation solution of the nite element analysis FEA The second algorithm data reordering enables the e ective usage of the memory subsystem by increasing the data locality so as to accelerate the per core performance of the FEA We present excellent strong scaling for several applications performed on various supercomputers including IBM Blue Gene BG L and BG P Cray XT3 and XT5 and Sun Constellation Cluster The applications involve the ow simulations of a bifurcation pipe model with relatively small meshes and cardiovascular ow of an abdominal aorta aneurysm model with a much bigger mesh more than 1 billion elements The other application involves the blood ow in a whole body model composed of 78 arteries from the neck to the toes The e ectiveness of our methodologies

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=503 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    geometry considered and more physiologically realistic boundary conditions are applied and fluid flow is coupled to structural models the computational complexity grows Massively parallel adaptivity and flow solvers with extreme scalability enable cardiovascular simulations to reach an extreme scale while keeping the time to solution reasonable In this paper we discuss our efforts in this area and provide two demonstrations one on an extremely large and complex geometry including many

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=504 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    tissues is inherently multiscale with the tissue dimension being in the centimeter length scale and the underlying collagen network being in the micrometer length scale This paper uses a volume averaging multiscale model to predict the collagen gel mechanics The model is simulated using a multiscale component toolkit that is capable of dealing with any 3D geometries Each scale in the multiscale model is treated as an independent component that

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=507 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    Conference Series Volume 180 Pages 012011 Issue 1 Abstract SciDAC applications have a demonstrated need for advanced software tools to manage the complexities associated with sophisticated geometry mesh and field manipulation tasks particularly as computer architectures move toward the petascale In this paper we describe a software component an abstract data model and programming interface designed to provide support for parallel unstructured mesh operations We describe key issues that must

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=508 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    determined by measuring contact angles of the liquid droplet at equilibrium states Correlations are established between the contact angle roughness factor r and surface fraction f The results show that for hydrophobic surfaces the contact angle as a function of roughness factor and surface fraction on nanogrooved surfaces obeys the predictions from Wenzel s theory for wetted contacts and Cassie s theory for composite contacts However slight deviations occur in

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=529 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    Journal of Computational Physics Volume 228 Pages 2535 2551 Publisher Elsevier Inc Abstract The objective of this paper is to provide a review of recent finite element formulations for immersed methods In these finite element formulations independent Lagrangian solid meshes are introduced to move on top of a background Eulerian fluid mesh This key feature allows the handling without excessive fluid mesh adaptation multiple deformable solids immersed in viscous fluid

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=530 (2015-07-15)
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