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Swirl flow studies in diffusers using the flux analysis method with orthogonal curvilinear coordinates
Author(s) -
Uchida S.,
Nakamura Y.,
Kondo T.
Publication year - 1982
Publication title -
international journal for numerical methods in engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.421
H-Index - 168
eISSN - 1097-0207
pISSN - 0029-5981
DOI - 10.1002/nme.1620180910
Subject(s) - curvilinear coordinates , inviscid flow , mechanics , stagnation point , vortex , flow (mathematics) , diffuser (optics) , mathematics , vorticity , flux (metallurgy) , stagnation temperature , geometry , physics , classical mechanics , materials science , optics , heat transfer , light source , metallurgy
A computational method of flux analysis is applied to the study of the swirling flow of different regimes through a diffuser pipe. The flux analysis method is an iterative procedure to construct a system of orthogonal curvilinear co‐ordinates consisting of stream‐surface and normals following the flow. Examples of the inviscid swirling flow of an incompressible fluid are calculated, and deformations of vortices in a diffuser pipe are studied. For a simple vortex with rigid rotation the deceleration of flow is remarkable on the axis, where the total energy has the lowest level. For a Burgers type vortex, provided the circulation number exceeds a critical value, the rate of deceleration of flow along the axis become more pronounced for only a slight increase of swirl strength, and ultimately a stagnation point appears on the axis. The present method, however, may not be applied to the flow with stagnation point.