Unstructured grid - Factbites

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Topic: Unstructured grid

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	GigaSpaces - Enterprise Data Grid
		The Data Grid is built for the most demanding business-critical applications, and utilizes the underlying resiliency features of the Enterprise Application Grid such as clustering, replication, fail-over and load-balancing to ensure data availability and coherence even in the most challenging environments.
		This distributed object store can manage a virtually endless amount of in-memory data, effectively bounded only by the amount of combined available physical memory on all of the machines on which the Enterprise Application Grid is running - and with new machines being able to be dynamically added, this effectively creates a limitless RAM.
		Object-data in the Data Grid can be queried through a standard JDBC interface using standard SQL queries.
	www.gigaspaces.com /product_a.html (229 words)

	Modelling Semantic Grid Knowledge Embedded in Documents
		Using well-assessed Natural Language Processing and Machine Learning methodologies and techniques, our goal is to acquire and organize the information stored in the Grid, where this information is supposed to be represented in unstructured documents.
		The growing success of Grid technologies inside scientific communities has produced an increasing need for the development of tools and methodologies able to support knowledge sharing and handling among people, built upon the Grid.
		In this paper we propose an original approach to the development of a system for the creation of the Knowledge Layer of the Semantic Grid, that is, the layer which carries the informative content that the community shares.
	csdl2.computer.org /persagen/DLAbsToc.jsp?resourcePath=/dl/proceedings/&toc=comp/proceedings/wetice/2004/2183/00/2183toc.xml&DOI=10.1109/ENABL.2004.45 (271 words)

	Amazon.co.uk: Search Results Books: P-Grid
		Basic Structured Grid Generation: With an Introduction to Unstructured Grid Generation
		Multiblock Grid Generation: Results of the EC/Brite-Euram Project Euromesh, 1990-1992 (Notes on Numerical Fluid Mechanics)
		Advances in Grid Computing - EGC 2005: European Grid Conference, Amsterdam, the Netherlands, February 14-16, 2005, Revised Selected Papers (Lecture Notes in Computer Science)
	www.amazon.co.uk /exec/obidos/external-search?tag=freedefinitio-21&keyword=P-Grid&mode=books-uk (271 words)

	Hummel Delta Wing - Frink & Pirzadeh
		An unstructured viscous grid of 730,454 tetrahedral cells was generated for a delta wing of aspect-ratio 1 by a version of the unstructured-grid generation code, VGRID, which was recently extended with the new Advancing-Layers method (ALM).
		To 1) apply an emerging unstructured, viscous grid generation code to construct a tetrahedral, viscous grid around a delta wing, 2) obtain a laminar solution from an unstructured viscous-flow solver, and 3) validate the result against experimental data and a structured-grid computation.
		Normal spacing is distributed near the surface to yield approximately 10 nodes (30 tetrahedra) in the mid-chord boundary layer for laminar flow.
	aaac.larc.nasa.gov /tsab/tetruss/images/hummel.html (420 words)

	Hummel Delta Wing - Frink & Pirzadeh
		An unstructured viscous grid of 730,454 tetrahedral cells was generated for a delta wing of aspect-ratio 1 by a version of the unstructured-grid generation code, VGRID, which was recently extended with the new Advancing-Layers method (ALM).
		To 1) apply an emerging unstructured, viscous grid generation code to construct a tetrahedral, viscous grid around a delta wing, 2) obtain a laminar solution from an unstructured viscous-flow solver, and 3) validate the result against experimental data and a structured-grid computation.
		Normal spacing is distributed near the surface to yield approximately 10 nodes (30 tetrahedra) in the mid-chord boundary layer for laminar flow.
	aaac.larc.nasa.gov /tsab/tetruss/images/hummel.html (420 words)

	1999 Summary of Engineering Research - Aeronautical and Astronautical Engineering
		In the approach, a distribution of grid control sources is defined from a flow solution and/or a grid quality measure of an initial grid, and grid points are redistributed through the influences of the grid control source.
		The turbulent flow is investigated with numerically coupled aeroelasticity deforming flaps using an unstructured finite-element method throughout.
		A grid adaptation scheme is developed based on the potential theory and numerical mapping.
	www.engr.uiuc.edu /communications/engineering_research/1999/pg000021.htm (733 words)

	Geometry in Action: Mesh Generation
		One distinguishes "structured" and "unstructured" meshes by the way the elements meet; a structured mesh is one in which the elements have the topology of a regular grid.
		Unstructured meshes are often computed using quadtrees, or by Delaunay triangulation of point sets; however there are quite varied approaches for selecting the points to be triangulated.
		Triangle, an incremental Delaunay-based 2d mesh generator by Jonathan Shewchuk of CMU, part of the CMU Archimedes project for unstructured finite element computation.
	www.ics.uci.edu /~eppstein/gina/meshgen.html (1005 words)

	Mesh Generation: Software
		Elements Research : EleGrid, generates structured and unstructured meshes on parametric surfaces.
		EMRC : DISPLAY III, automatic and mapped mesh generation for 2D and 3D geometries using shells and solids (structured and unstructured).
		LBG ( WIAS) : A layer based 3D structured (cartesian) grid generator.
	www-users.informatik.rwth-aachen.de /~roberts/software.html (1005 words)

	Table of contents for Library of Congress control number 2004351724
		Mathematical preliminaries - vector and tensor analysis Classical differential geometry of space-curves Differential geometry of surfaces in E3 Structured grid generation - algebraic methods Differential models for grid generation Variational methods and adaptive grid generation Moving grids and time-dependent co-ordinate systems Unstructured grid generation Bibliography Index
	www.loc.gov /catdir/toc/els051/2004351724.html (107 words)

	Mesh Generation
		A structured mesh is usually a warped grid of boxes, while an unstructured mesh is typically a triangulation.
		A mesh generator has to ``parse'' the domain, which is hard to accomplish unless the grid generator is intimately tied to the systems used to represent the geometry.
		Structured meshes are currently more popular, but unstructured are catching up, especially in the more academically-inclined community.
	people.csail.mit.edu /seth/pubs/taskforce/section3_7.html (1409 words)

	Directory of open access journals
		Convergence acceleration to steady state is achieved through the implementation of an agglomeration multigrid procedure, which retains all the flexibility previously available in the unstructured grid code.
		The paper describes the implementation details and validation results for an agglomeration multigrid procedure developed in the context of hybrid, unstructured grid solutions of aerodynamic flows.
		Studies of the various parameters affecting the multigrid acceleration performance are undertaken with the objective of determining optimal numerical parameter combinations.
	www.doaj.org /abstract?id=46060&toc=y (1409 words)

	Argonne Transportation - CHAD
		The CHAD program uses a strategy called an "unstructured mesh." Unlike traditional mesh techniques in which a regular grid structure is maintained, an unstructured mesh uses thousands of hexagonal cells that can conform to the shapes of diverse components, including intake manifolds and fuel injectors, combustion chambers, exhaust manifolds, mufflers, catalytic converters, and air ducts.
		Computational grid used to model air flow in the passenger compartment of a minivan
		CHAD is a parallel computational fluid dynamics program developed by five U.S. Department of Energy laboratories (Los Alamos, Argonne, Lawrence Livermore, Oak Ridge, and Sandia) in partnership with the "Big Three" automobile manufacturers (Chrysler, Ford, and General Motors).
	www.transportation.anl.gov /research/modeling/virtual.html (487 words)

	Background to Watershed Models
		The unstructured grid, finite volume/finite difference models are a relatively new family of models recently developed by Casulli and Waters (2001) for UnTRIM (Unstructured grid, Tidal Residual Intertidal Model) and Zhang and Baptista (2004) for the ELCIRC (Eulerian-Lagrangian CIRCulation) model.
		’s rapidly urbanizing watershed, high impact agricultural practices, and increasing population have resulted in excessive nutrient enrichment in the bay.
		The semi-implicit scheme used by ELCIRC is a stable and efficient semi-implicit numerical algorithm proposed by Casulli (1990).
	ccmp.chesapeake.org /CCMP/ACTIVITIES/BASINWIDE/CCMPPropFinal.htm (487 words)

	ONERA M6 Wing - Frink & Pirzadeh
		A matrix of eight thin-layered tetrahedral grids were generated for the ONERA M6 wing with the VGRIDns unstructured tetrahedral grid generator.
		Grid sizes ranged from 324,356 tetrahedral cells where the midchord boundary layer (BL) is resolved by 12 tetrahedra, to 463,968 cells with 30 tetrahedra resolving the BL.
		To establish guidelines for the efficient application of a new tetrahedral cell-centered unstructured Navier-Stokes capability to high-Reynolds number, transonic, separated flows.
	aaac.larc.nasa.gov /tsab/tetruss/images/om6visc.html (487 words)

	Nat' Academies Press, Twenty-Second Symposium on Naval Hydrodynamics (1999)
		Hino, T., “An Unstructured Grid Method for Incompressible Viscous Flows with a Free Surface”, AIAA Paper 97–0862, 1997, American Institute of Aeronautics and Astronautics.
		Hino T, “A 3D Unstructured Grid Method for Incompressible Viscous Flows”, Journal of the Society of Naval Architects of Japan, Vol.
		Suzuki, T., Okuni, T., Nozawa, K. and Suzuki, H., “Characteristics of Turbulent Boundary Layer in a Stern Flow Field with Longitudinal Vortices”, Proceedings of the Twenty-Seventh Symposium on Turbulence, 1995, pp.
	www.nap.edu /openbook.php?record_id=9771&page=474 (487 words)

	UWS Dept. of Civil Engineering
		J. Peraire, J. Peiro, K. Morgan and O. Hassan, 'An unstructured multigrid technique for the Euler equations', in Proc.
		R.R. Thareja, J.R. Stewart, O. Hassan, K. Morgan and J. Peraire, 'A point implicit unstructured grid solver for the Euler and Navier-Stokes equations', AIAA 26th Aerospace Sciences Meeting, Reno, Paper 88-0036, 1988
		J. Peiro, M. Vahdati, J. Peraire, K. Morgan and O. Hassan, 'A comparison of three unstructured mesh algorithms for solving the Euler equations', in Proc.
	www.swan.ac.uk /civeng/General/staff/ohpubs.htm (487 words)

	Towards Automatic Multiblock Topology Generation
		A new approach to automatically process a multiblock topology in order to prepare it for the grid generation process is described.
		The method is based on a cost function which attempts to model the objectives of the skilled grid generation software user who at present performs the task of block positioning and shaping in an interactive manner.
		It is also suggested that an existing unstructured mesh generation method could be adopted as an initial topology generation tool.
	www.aero.gla.ac.uk /Research/CFD/projects/pmb/pubs/html/tr9826.html (487 words)

	An Efficient Adaptive Editor for Unstructured Grids
		A new grid optimizer based upon a posteriori error estimates is presented and applied to circulations in large coastal/estuary regions.
		Zhang, Yinglong; Baptista, Antonio M. Numerical Grid Generation in Computational Field Simulations, The International Society of Grid Generation, pp.395-404, September 2000
		Contact author(s) or publisher for availability and copyright information on above referenced article
	www.contrib.andrew.cmu.edu /~sowen/abstracts/Zh913.html (157 words)

	Throwback Baseball Hats - Sport Caps
		Unstructured style features a throwback team logo on front and throwback NFL Shield on rear of the hat.
		Comfortable 100% cotton cap is part of the Grid Iron throwback look from Reebok official brand of the NFL.
		San Francisco 49ers Grid Iron Classic Throwback Hat
	www.shoppingdepot.net /throwback_hats.html (552 words)

	Paul Heckbert's Collection of Mesh Generation Links
		The bias of these links is toward anisotropic unstructured triangular mesh generation (and consequently toward viscous flow applications).
		There are also some links not specifically focused on mesh generation, relating to computational fluid dynamics (CFD), finite element methods (FEM), multigrid, triangulation, and computational geometry.
		Hybrid Prismatic/Tetrahedral Grid Generation paper abstract U of Texas
	www.cs.cmu.edu /~ph/mesh.html (638 words)

	CFD-CTA
		There are currently underway six (6) general purpose, scalable CFD software projects based on variations of the three general types of gridding methods used to represent complex flow geometry: the rectilinear structured grid, the scalable unstructured grid, and the local block structured/overset grid.
		CFD is used for basic studies of fluid dynamics, for engineering design of complex flow configurations, and for predicting the interactions of chemistry with fluid flow for combustion and propulsion.
		Fluid dynamics itself displays some very complex physics, such as boundary-layer flows, transition to turbulence, and turbulence dynamics, that require continued scientific research.
	www.lcp.nrl.navy.mil /cfd-cta (752 words)

	CS267: Notes for Lecture 13, Feb 27, 1996
		Completely irregular regions can be "triangulated" using a variety of computational geometry algorithm, yields an unstructured grid, such as the NASA Airfoil, or others in the talk.
		If one expects a solution to change rapidly in a certain region but remain smooth in another, one wants more grid points in the region of rapid change and fewer in the smooth region, in order to do not much more work than is needed to get the answer to the desired accuracy.
		In terms of the last figure, this gives us a formula to compute the values of U(i,m+1) at all the internal grid points in row m+1 of the discretization, in terms of the values of U(m,i) in row m.
	http.cs.berkeley.edu /~demmel/cs267/lecture17/lecture17.html (752 words)

	SURE, Petroleum Reservoir Simulation Software, PEBI Grid Technology
		With "unstructured" PEBI gridding, you can easily set different parts of a single simulation model to different scales--down to wellbore size.
		SUREGrid's unique 'unstructured' PEBI- gridding allows you to mix a wide variety of grid types and scales within a single simulation model, while maintaining mathematically-correct flow calculations between cells.
		Through properly interfaced files from SUREGrid, you now have the ability to run sophisticated, unstructured PEBI grids even in simulators developed for structured grids.
	www.simsoftec.com /docs/products/suregrid.php (772 words)

	ei9094.98.display.new -- Search/Display
		The temporal-adaptive algorithm is a time-accurate integration procedure that allows flows with high spatial and temporal gradients to be computed efficiently by advancing each grid cell near its maximum allowable time step.
		The flow solver involves an upwind flux-split spatial discretization for the convective terms and central differencing for the shear-stress and heat flux terms on an unstructured mesh of triangles.
		Identifiers: Adaptive finite volume solution; Numerical losses; Two dimensional Euler equations; Delaunay triangulation; Unstructured meshes; Steady state solution; Multistage Runge Kutta algorithm
	www.ccalmr.ogi.edu /~pturner/gridgeneration/compendex/eipcxabs4.htm (772 words)

	NASA Geometry Laboratory Publications
		Trey Arthur and Michael J. Bockelie, A Comparison of Using APPL and PVM for a Parallel Implementation of an Unstructured Grid Generation Program, NASA CR-191425, January 1993, pp.
		Jamshid Samareh-Abolhassani, Triangulation of NURBS Surfaces, 4th International Conference on Numerical Grid Generation in Computational Fluid Dynamics and Related Fields, Swansea, Wales, UK, April 1994, pp.
		Patricia A. Kerr, Robert E. Smith and Mary-Anne Posenau, GEOmetry LABoratory (GEOLAB): Surface Modeling and Grid Generation Technology and Services, NASA CP-3291, May 1995, pp.
	geolab.larc.nasa.gov /GEOLAB/Publications (772 words)

	CGNS SIDS-to-ADF File Mapping Manual - Detailed CGNS Node Descriptions
		For an unstructured grid, it always equals one, meaning that a unique index is required to specified a node location.
		equal to two and a physical dimension of three, that is, a structured grid on a curved surface.
		Their children, in turn, record grid, field, connectivity, and boundary conditions, and a variety of auxiliary data.
	www.lerc.nasa.gov /WWW/cgns/filemap/nodes.html (772 words)

	UTC SimCenter
		Gaither, J., Marcum, D., and Mitchell, B., "SolidMesh: A Solid Modeling Approach to Unstructured Grid Generation," 7th International Conference on Numerical Grid Generation in Computational Field Simulations, September 2000.
		Arabshahi, A., Beddhu, M., Briley, W.R., Chen, J.P., Gaither, A., Gaither, K., Janus, J.M., Jiang, M., Marcum, D., McGinley, J., Pankajakshan, R., Remotigue, M., Sheng, C., Sreenivas, K., Taylor, L.K., and Whitfield, D.L., "A Perspective on Naval Hydrodynamic Flow Simulations," Presented at the 22nd Symposium on Naval Hydrodynamics, Washington, D.C., August 9-14, 1998.
		Melnik, R. E., "Navier-Stokes Computations of Turbulent Flows Using a New Wall Boundary Condition," presented at the 4th International Symposium on Computational Fluid Dynamics at the University of California at Davis, CA September,1991, (coauthor).
	www.utc.edu /Research/SimCenter/publications.shtml (10182 words)

	A Boundary Representation Solid Modelling Data Structure for General Numerical Grid Generation (ResearchIndex)
		Abstract: The purpose of this thesis is to develop a topology data structure that supports both structured and unstructured grid generation methods.
		The minimal topological information needed for computing both structured and unstructured grids is used to determine that a non manifold boundary representation topology...
		This topology data structure directly supports the method of building edge grids, surface grids and volume grids in order to construct high quality computational fluid dynamics (CFD) grids.
	citeseer.ist.psu.edu /gaither97boundary.html (194 words)

	ICEM CFD Engineering - From CAD to Grid Generation for Analysis
		The grid generation tools of ICEM CFD offer the capability to create grids from geometry in multi-block structured, unstructured hexahedral, tetrahedral, hybrid grids consisting of hexahedral, tetrahedral, pyramidal and prismatic cells, as well as Cartesian grid formats combined with boundary conditions.
		The state of the art CFD post-processing and visualization tool, ICEM CFD Visual3, supports solutions in structured, unstructured, steady state, or transient data and contains powerful features while providing an open scripting system for easy customization.
		ICEM CFD provides translators to over 100 flow solvers and structural analysis codes, as well as standard formats including CGNS.
	www-berkeley.ansys.com (313 words)

	The MayaVi Data Visualizer
		Works for rectilinear, structured, unstructured grid data and also for polygonal data.
		Only the binary structured grid format works because of current limitations in VTK's vtkPLOT3DReader.
		It is also cross platform and should run on any platform where both Python and VTK are available (which is almost any *nix, Mac OSX or Windows).
	mayavi.sourceforge.net (313 words)

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In the News (Sat 26 Dec 09)