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  • RPI SCOREC - Technical Reports
    remains an intractable problem for realistic anatomic and physiologic models We have developed a new method to model blood flow in three dimensional deformable models of arteries The method couples the equations of the deformation of the vessel wall at the variational level as a boundary condition for the fluid domain by assuming that for a thin walled structure the internal traction due to the fluid friction is felt uniformly

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=436 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    of accessing CAD geometry for mesh generation and will review several of the issues associated with accessing CAD geometry for mesh generation This paper will also evaluate alternative techniques for accessing CAD geometry and review how these techniques address or do not address the issues related to CAD geometry access for mesh generation The techniques for CAD geometry access to be reviewed include Translation Healing Discrete Representations Direct Geometry Access

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=320 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    Oriented Approach to 3D Graphics 3rd Edition Pages 496 Publisher Kitware Inc ISBN 1 930934 07 6 Abstract Visualization is an essential part of the computational sciences While today s complex numerical techniques produce results of unparalleled accuracy they also produce prodigious amounts of data To realize the true potential of this information visualization techniques are required to effi ciently convey the meaning of the information to the analyst In

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=321 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    However a major deterrent in their effective use has been the need to provide a new mesh to represent the deformed workpiece Until recently this process known as remeshing was performed manually by process designers Each workpiece remesh can potentially take several days for a complex 3 D component Hence an automated modeling environment that would automatically remesh the deformed workpiece when required and continue the analysis can dramatically reduce the overall modeling time and result in this technology being used in the design of industrial forming processes This has provided the motivation for the thesis research that has led to the development of an automated modeling system for forming simulation The research effort has focused on the issues that must be addressed in developing an automated modeling system that is robust has automated procedures to update the geometry and remeshes the deformed workpiece model with concern for controlling the simulation errors Major contributions arising out of this work include procedures for i automatic remeshing of the deformed workpiece ii use of CAD model of the die geometry during analysis and remeshing and iii curvature compensation of nodes on workpiece freesurface Curvature compensation of nodes allows us to mimic the

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=323 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    this issue A mesh metric field has been used to represent the element shape and size distribution Definition significance of the mesh metric field and the conformity criteria between the mesh and the mesh metric field are given At low level the mesh adaptation procedure operates as a sequence of mesh modification operators ordered to make the mesh conform to a given mesh metric field The mesh modification procedure consists of four related high level components mesh refinement mesh coarsening projecting boundary vertices onto curved geometry and element shape correction The mesh is efficiently aligned to the mesh metric field by incremental refinement and coarsening based on edge length analysis with respect to the mesh metric field Several techniques have been developed to ensure effective alignment to the mesh metric field for example simultaneous split of a set of longest mesh edges collapsing the shortest mesh edge every other vertex diagonal edge selection in case of ambiguity and the use of lookup tables The curved geometry approximation issue is addressed by the procedure of projecting boundary vertices onto geometry The procedure first effectively projects as many vertices as possible using local mesh modifications The possible remaining un projected vertices after

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=324 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    US RESEARCH RESEARCHERS REPORTS SOFTWARE FACILITIES EMAIL SERVICES WIKIS Author B Ramesh Title A Stabilized Finite Element Formulation for the Optimal Design of Forming Processes Year 2003 School Rensselaer Polytechnic

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=325 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    linear polymers located close to spherical impenetrable surfaces is studied in dense systems by means of lattice Monte Carlo simulations The role of the various types of interactions entropic cohesive in the bulk polymer attraction to filler surface and that of the chain length polymer density and wall curvature in defining the polymer structure is analyzed The size effect of the spherical fillers is investigated by scaling the filler radius at constant filler volume fraction On the bond scale the chain ends segregate to the wall in all systems with the effect being essentially independent of wall curvature The bonds are preferentially oriented in the direction tangential to the wall The distance from the wall over which these effects are observed is about one bond length in the athermal case and about two chain gyration radii in the energetic case On the chain scale the ellipsoidal chains undergo a docking transition to the spherical fillers The ellipsoids do not deform rather rotate with their large semi axis in the direction tangential to the filler as their centers of mass approach the wall This configurational entropy controlled situation remains valid when cohesive interactions are considered in the bulk polymer and even

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=333 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    entropic component is due to chain conformation changes upon deformation In rubbers the entropic component is dominant Both components are intrinsically non local stress at a point depends on the deformation in a whole neighborhood of that point This property becomes important when the deformation field varies significantly over a distance comparable with the internal length scale of the material large gradients Here non local formulations are derived for both

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=334 (2015-07-15)
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