Accession Number:

ADA455285

Title:

A Unified View of Global Instability of Compressible Flow over Open Cavities

Descriptive Note:

Final rept. 20 Mar 2003-25 May 2006

Corporate Author:

NU-MODELING INC MADRID (SPAIN)

Personal Author(s):

Report Date:

2006-03-28

Pagination or Media Count:

56.0

Abstract:

This report results from a contract tasking Nu-modeling Inc, as follows The contractor will investigate the global linear instability of three- dimensional flow over an open cavity to develop a unified framework for understanding and controlling cavity-driven instabilities, Specifically the contractor will 1 Perform global instability analyses of the flow field in two-dimensional open cavities 2 Investigate linear and nonlinear interaction of the modes using simplified models and compare with DNS results, and assess the limits of usefulness of existing empirical prediction models, 3 Perform two-dimensional DNS and global instability analysis of full-bay open-cavity models, Compare results with DNS andor experiment, and propose adjustments of the empirical models, 4 Perform three-dimensional DNS in empty open cavities and classify global instabilities as functions of flow and geometric parameters, 5 Propose theoretically founded flow-control strategies for realistic geometries and flow conditions,

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE