Unsteady Three Dimensional Simulation Of Vortex Breakdown
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Three-Dimensional Simulation of Vortex Breakdown
Author | : National Aeronautics and Space Adm Nasa |
Publisher | : |
Total Pages | : 80 |
Release | : 2018-11-12 |
Genre | : |
ISBN | : 9781731186324 |
The integral form of the complete, unsteady, compressible, three-dimensional Navier-Stokes equations in the conservation form, cast in generalized coordinate system, are solved, numerically, to simulate the vortex breakdown phenomenon. The inviscid fluxes are discretized using Roe's upwind-biased flux-difference splitting scheme and the viscous fluxes are discretized using central differencing. Time integration is performed using a backward Euler ADI (alternating direction implicit) scheme. A full approximation multigrid is used to accelerate the convergence to steady state. Kuruvila, G. and Salas, M. D. Langley Research Center...
A Numerical Study of Three-dimensional Vortex Breakdown
Author | : Robert Edward Spall |
Publisher | : |
Total Pages | : 268 |
Release | : 1987 |
Genre | : Fluid mechanics |
ISBN | : |
Navier-Stokes Simulation of Quasi-axisymmetric and Three-dimensional Supersonic Vortex Breakdown
Author | : Hamdy A. Kandil |
Publisher | : |
Total Pages | : 454 |
Release | : 1993 |
Genre | : Fluid dynamics |
ISBN | : |
Numerical Simulation of Vortex Breakdown by the Vortex-filament Method
Author | : Y. Nakamura |
Publisher | : |
Total Pages | : 20 |
Release | : 1983 |
Genre | : Numerical analysis |
ISBN | : |
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 spiral winding of the filaments. First, an accuracy check was performed for a cylindrical swirling flow field that can be simulated to any accuracy by increasing the number of filaments. Second, an axisymmetric-type vortex breakdown was simulated, with experimental data serving asupstream conditions. The calculated axial- and theta-velocity contours show the breakdown of the vortex, including a rapid change in the 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 out of the spiral type in correspondence with experimental observations. The present method can easily be used to simulate other types of vortex breakdown or other vortex flows with axial velocity.