We describe the development and use of a hybrid n-dimensional grid generation system called NWGRID. The Applied Mathematics Group at Pacific Northwest National Laboratory (PNNL) is developing this tool to support the Laboratory's computational science efforts in chemistry, biology, engineering and environmental (subsurface and atmospheric) modeling. NWGRID is the grid generation system, which is designed for multi-scale, multi-material, multi-physics, time-dependent, 3-D, hybrid grids that are either statically adapted or evolved in time. NWGRID'S capabilities include static and dynamic grids, hybrid grids, managing colliding surfaces, and grid optimization [using reconnections, smoothing, and adaptive mesh refinement (AMR) algorithms]. NWGRID'S data structure can manage an arbitrary number of grid objects, each with an arbitrary number of grid attributes. NWGRID uses surface geometry to build volumes by using combinations of Boolean operators and order relations. Point distributions can be input, generated using either ray shooting techniques or defined point-by-point. Connectivity matrices are then generated automatically for all variations of hybrid grids.
Revised: November 10, 2005 |
Published: September 1, 2000
Citation
Jones-Oliveira J.B., J.S. Oliveira, L.L. Trease, and H.E. Trease. 2000.Hybrid Grid Generation Using NW Grid. In NUMERICAL GRID GENERATION IN COMPUTATIONAL FIELD SIMULATIONS, 7th, edited by B.K. Soni, J. Hauser, J.F. Thompson, P.R. Eiseman, 479-486. Mississippi State, Mississippi:International Society of Grid Generation.PNNL-SA-33374.