Adaptive Grids for Raven

Period of Performance: 08/07/1987 - 08/07/1989

$491K

Phase 2 SBIR

Recipient Firm

Ecodynamics Research Assoc., Inc.
P.O. Box 9229
Albuquerque, NM 87119
Principal Investigator

Abstract

THIS PROPOSAL IS FOR THE INCORPORATION OF ADAPTIVE GRID NUMERICAL METHODS AND OTHER ALGORITHMIC AND STRUCTURAL IMPROVEMENTS INTO AN EXISTING TIME DEPENDENT THREE DIMENSIONAL NAVIER-STOKES COMPUTER MODEL, THE RAVEN CODE. THE FINAL CODE, RAVEN II, WILL INCLUDE THE FOLLOWING FEATURES: EXPLICIT SECOND ORDER FLUID DYNAMICS ALGORITHMS, INCLUDING FCT; OPTIONS FOR LOCAL TIME STEPPING AND IMPLICIT CHEMISTRY; AUTOMATIC ERROR ESTIMATION; REDUCTION OF ARRAY STORAGE RETENTION OF 1D ELEMENT IDENTIFIERS, WITH MAPPING TO LOGICALLY CARTESIAN DATA STRUCTURES; HYBRID VARIATIONAL ADAPTIVE GRID GENERATION ALGORITHM; CODE OPTIMIZATION PRIMARILY FOCUSED ON FINE-SCALE PARALLELISM AND PAGING OPERATIONS FOR THE CRAV 2; FORMATION OF A SMALL USER GROUP TO EVALUATE RAVEN II; SIMPLIFIED USER INTERFACE UTILIZING A PORTABLE NAMALIST TECHNIQUE FOR ALL INPUT VARIABLES; REDUCTION OF PROBLEM SETUP TIME; FORMAL MANAGEMENT OF THE CODE DEVELOPMENT AND MAINTENANCE; AND EXTENSION OF THE "UPDATE" STRUCTURE TO ALL MODULES. THE COMBINATION OF THE ADAPTIVE GRID GENERATION, ADVANCED FLUID DYNAMIC ALGORITHMS, AND AUTOMATIC ERROR ESTIMATION, ALL TAILORED TO SUPERCOMPUTER ARCHITECTURE, HAS TREMENDOUS POTENTIAL FOR IMPROVING THE EFFICIENCY, EASE OF USE, ROBUSTNESS, AND ACCURACCY OF SOLUTIONS.