Acknowledgements
Work undertaken by The
Numerical Algorithms Group Ltd
Oxford, UK
(by Jeremy Walton).
What is a pyramid?
- IRIS Explorer data type
- Hierarchy of elements in layers
- Connections between elements in adjacent layers
- Lattice used to store data and coords for elements in a layer
- Used for hierachical data structures such as finite element (FE) data
Pyramids and FE data
- Layers contain elements of different dimensionality
- Hierarchy defines FE grid as
- objects made up of
- cells made up of
- faces made up of
- edges made up of
- vertices
Storing element data in layers
- Storage for data and coords for
- vertices in base lattice
- edges in layer[0] lattice
- faces in layer[1] lattice
- cells in layer[2] lattice
- objects in layer[3] lattice
- ...
What's new?
- Currently, most modules only use data in the base lattice
- Modules are now being updated to use data at other levels as well
New ReadAVSucd
- Reads files in AVS unstructured cell datatype format
- vertex coords
- cell connectivity
- vertex data
- cell data new
- No coords for cell data in this format, so generate them from vertex coords
New PyrToGeom
- Creates geometry from pyramid as
- vertices (points)
- edges (vectors)
- faces (polygons)
- cells (external polygons)
- Geometry coloured according to
- data in base lattice, or
- data in level lattice, if present new
Examples
FE data (1)
- FE calculation on machine part
- Calculates
- Displacements at nodes
- Velocities in cells
- Data read into pyramid using ReadAVSucd
- PyrToLat extracts lattice from pyramid layer
- VectorDisplay displays vectors
FE data (2)
- FE calculation on cylinder segment
- Calculates
- Temperature at nodes (vertices)
- Stresses in elements (cells)
- PyrToGeom creates geometry and colours it according to
- vertex data, or
- cell data
FE data (3)
- FE calculation on blade
- 5500 nodes, 3000 cells
- Calculates
- Temperature at nodes
- Centroid pressure at cells
- PyrToGeom creates geometry and colours it according to
- vertex data, or
- cell data
Last modified: Mon Aug 5 14:50:24 1996
[ Posters Home ]
© The Numerical Algorithms Group Ltd, Oxford UK, 1996.