Saves Valuable Time
Expensive three dimensional computer simulations, commonly
used by engineers and scientists, can now be done for a small
fraction of the cost. By most estimates, creating a mesh or grid
for the computer simulation is 80% of the cost. A team of Ph.D.
Mathematicians and Engineers at XYZ Scientific Applications in
Livermore, California have perfected a method which can accomplish
in several days with TrueGrid®
what usually takes a designer several months of work with other
mesh generation programs.
Mesh GenerationTrueGrid® is a computer program used to tessellate a geometric model into hexahedron brick elements and quadrilateral shell elements. The result, called a mesh or a grid, is required by today's FEA and CFD analysis codes which simulate the behavior of structures, fluids, and other complex physical systems. TrueGrid® removes the drudgery of modeling large complex objects, drastically reducing the time involved, while maintaining the highest quality meshes.
Projection MethodTrueGrid®'s projection method (based on projective geometry) eliminates the need for the user to specify the bulk of the details required by other CAD-oriented mesh generators. And this precise projection method can deal with complex geometries -- modeling turbines, pumps, jet engines, wings, transmissions, and even human anatomy. Surfaces and curves can have unrestricted curvature. The user points and clicks on the surfaces and TrueGrid® does the rest. Nodes are automatically distributed on surfaces with boundary nodes automatically placed at the intersections of these surfaces. The distribution of nodes is controlled by sophisticated interpolation and smoothing methods.
Sandia National Laboratory report Solid Model Design Simplification (SAND97-3141 * UC-705) contains further discussion of the issues related to geometry (especially CAD).
Multiple Block Structured PartsTrueGrid® supports highly structured, multi-block meshes, which produces quality meshes. Simulation codes more quickly produce more accurate simulations using these meshes. Each block is composed of 3D hexahedral, 2D quadrilateral, and 1D linear or quadratic elements arranged in rows, columns, and layers. TrueGrid® has the flexibility to build a multiple block structured mesh conforming to the most complex geometries. Below is an exploded view of a model of a loud speaker with 8 multiple block parts, consisting of both bricks and shells.
Import The Geometry - Export The ModelModern designs can be accomplished using a Computer Aided Design system (CAD) or a Solids Modeler. TrueGrid® uses the IGES standard interface to import the geometry and transform the design into a numerical model needed by a simulation code. Because of the superiority of the projection method, no "clean up" is required! (Clean up is only required when using a geometry-based mesh generator.)
TrueGrid® also has many types of surfaces and curves using geometric forms, functions, and arbitrary data. In addition, boundary and initial conditions, constraints, and loads are assigned to the model. The TrueGrid® user can then select to format the model data for most of the popular three-dimensional simulation codes.
Graphical User InterfaceTrueGrid® features a modern graphical user interface (114 Kb) that allows development of the mesh by "point and click". Graphics takes full advantage of color, producing vibrantly colored pictures of the geometry and the mesh. All of the meshes and grids in this web site were produced by TrueGrid®. Prompts, dialogue boxes, and an on-line help package intuitively guide the user in creating the mesh. Highly optimized and robust algorithms make it possible to build quality meshes interactively. Sophisticated three-dimensional graphics techniques allow the user to view the mesh as it is built.
HistoryFor over ten years major research laboratories have used an earlier version of this code, called INGRID, on supercomputers. XYZ Scientific Applications now offers a significantly improved version of this advanced technology to the entire engineering and scientific community.
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