Accession Number : ADA299235

Title :   A Predictor-Corrector Technique for Visualizing Unsteady Flow.

Descriptive Note : Contractor rept.,

Corporate Author : INSTITUTE FOR COMPUTER APPLICATIONS IN SCIENCE AND ENGINEERING HAMPTON VA

Personal Author(s) : Banks, David C. ; Singer, Bart A.

PDF Url : ADA299235

Report Date : JUL 1995

Pagination or Media Count : 31

Abstract : We present a method for visualizing unsteady flow by displaying its vortices. The vortices are identified by using a vorticity-predictor pressure-corrector scheme that follows vortex cores. The cross-sections of a vortex at each point along the core can be represented by a Fourier series. A vortex can be faithfully reconstructed from the series as a simple quadrilateral mesh, or its reconstruction can be enhanced to indicate helical motion. The mesh can reduce the representation of the flow features by a factor of one thousand or more compared with the volumetric dataset. With this amount of reduction it is possible to implement an interactive system on a graphics workstation to permit a viewer to examine, in three dimensions, the evolution of the vortical structures in a complex, unsteady flow. (AN)

Descriptors :   *VORTICES, *FLOW VISUALIZATION, *FLOW FIELDS, *UNSTEADY FLOW, PRESSURE GRADIENTS, MATHEMATICAL MODELS, ALGORITHMS, COMPUTERIZED SIMULATION, IMAGE PROCESSING, PREDICTIONS, TURBULENT FLOW, COMPUTATIONAL FLUID DYNAMICS, DATA REDUCTION, COMPUTER GRAPHICS, INTERACTIVE GRAPHICS, DATA COMPRESSION, SHEAR FLOW, THREE DIMENSIONAL FLOW, FOURIER SERIES.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE