Accession Number : ADA264705


Title :   Analysis and Computation for Vortex Dynamics and Rarefied Gases


Descriptive Note : Final rept. 1 Nov 1989-31 Oct 1992


Corporate Author : YALE UNIV NEW HAVEN CT DEPT OF MATHEMATICS


Personal Author(s) : Caflisch, Russel


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a264705.pdf


Report Date : Dec 1992


Pagination or Media Count : 3


Abstract : The researchers have developed a variety of adapted orthogonal transforms for signal compression and analysis. These methods have been used successfully in sound and high resolution image compression and are currently being tested for their technological value. In parallel, the best basis algorithm has been used by K. Sreenivasan for analysis of experimental turbulence data, and by M. Farge and V. Wickerhauser for the analysis of simulated two dimensional vorticity fields. This analysis permits a more careful comparison between simulation and experiment by detecting subtle differences in structures. By extracting coherent structures in the flows it promises to permit efficient tracking of these structures. In particular, as a result of testing by the FBI and Scotland Yard, a variant of these algorithms has been chosen for as a. standard for fingerprint image compression with an estimated initial saving to the FBI in storage hardware alone of $25,000,000. These methods are also being tested, in collaboration with Martin Marietta, for automatic target recognition.


Descriptors :   *VORTICES , *RAREFIED GASES , COMPRESSION , ALGORITHMS , SIMULATION , COMPUTATIONS , TWO DIMENSIONAL , HIGH RESOLUTION , IMAGES , STANDARDS , SCOTLAND , FINGERPRINTS , ORTHOGONALITY , SAVINGS , AUTOMATIC , STORAGE , DATA COMPRESSION , SOUND , SIGNALS , TARGETS , TARGET RECOGNITION , RESOLUTION , TRACKING , TURBULENCE


Subject Categories : Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE