NTRS - NASA Technical Reports Server

Back to Results
The structure and dynamics of bubble-type vortex breakdownA unique discrete form of the Navier-Stokes equations for unsteady, three-dimensional, incompressible flow has been used to study vortex breakdown numerically. A Burgers-type vortex was introduced along the central axis of the computational domain, and allowed to evolve in space and time. By varying the strength of the vortex and the free stream axial velocity distribution, using a previously developed Rossby number criterion as a guide, the location and size of the vortex breakdown region was controlled. While the boundaries of the vortex breakdown bubble appear to be nominally symmetric, the internal flow field is not. Consequently, the mechanisms for mixing and entrainment required to sustain the bubble region are different from those suggested by earlier axisymmetric models. Results presented in this study, for a Reynolds number of 200, are in good qualitative agreement with higher Reynolds number experimental observations, and a variety of plots have been presented to help illuminate the fluid physics.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Spall, R. E.
(Old Dominion Univ. Norfolk, VA, United States)
Ash, R. L.
(Old Dominion University Norfolk, VA, United States)
Gatski, T. B.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1990
Publication Information
Publication: Proceedings, Series A - Mathematical and Physical Sciences
Volume: 429
ISSN: 0080-4630
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
Funding Number(s)
Distribution Limits

Available Downloads

There are no available downloads for this record.
No Preview Available