Numerical Simulation of Vortex Breakdown in an Eccentric Spherical Gap PDF Download
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Author: Dongbin Xiu
Publisher:
ISBN:
Category :
Languages : en
Pages : 104
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Book Description
Author: Dongbin Xiu
Publisher:
ISBN:
Category :
Languages : en
Pages : 104
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Book Description
Author: T. H. Lê
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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Book Description
Author: Y. Nakamura
Publisher:
ISBN:
Category : Numerical analysis
Languages : en
Pages : 20
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Book Description
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.
Author: Jasim Uddin Ahmad
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 318
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Author: John Paul Watson
Publisher:
ISBN:
Category : Voretx-motion
Languages : en
Pages : 284
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Author: Reid Barlow Melville
Publisher:
ISBN:
Category :
Languages : en
Pages : 220
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Author: Mitsuhiro Murayama
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Steven James Massey
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 202
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Author: Elsayed Abdelfattah Shabana
Publisher:
ISBN:
Category :
Languages : en
Pages : 240
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
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Book Description
Vortex breakdown is simulated by a three dimensional Lagrangian method using vortex filaments. The filaments are approximated by vortex elements and their velocity is computed by a Biot-Savart type law of interaction. The numerical calculations show the development of an axisymmetric bubble with a recirculation zone and resemble in many respects the results obtained in the physical experiments on vortex breakdown.
