Numerical Simulation of Vortex Breakdown by the Vortex-Filament Method,
Abstract
The vortex-filament method was applied to the simulation of vortex breakdown. The principal vortex region was represented by multiple filaments, and an axial velocity component was induced by a sprial winding of the filaments. First, an accuracy check was performed for a cylindrical swirling flow with simple analytical expressions for the axial and theta velocities. The result suggests that the flow field can be simulated to any accuracy by increasing the number of filaments. Second, an axisymmetric-type vortex breakdown was simulated, with experimental data serving as upstream conditions. The calculated axial-and theta-velocity contours show the breakdown of the vortex, including a rapid change in th vortex core, followed axially by a recovery zone and then a second breakdown. When three-dimensional initial data are used the second breakdown appears to be of the spiral type in correspondence with experimental observations. The present method can easily by used to simulate other types of vortex breakdown or other vortex flows with axial velocity. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1983
- Accession Number
- ADP002265
Entities
People
- A. Léonard
- P. R. Spalart
- Y. Nakamura
Organizations
- Ames Research Center