Anisotropic characteristics of turbulence dissipation in swirling flow: A direct numerical simulation study

Yang, X, Gui, N, Xie, G, Yan, J, Tu, J and Jiang, S 2015, 'Anisotropic characteristics of turbulence dissipation in swirling flow: A direct numerical simulation study', Advances in Mathematical Physics, vol. 2015, 657620, pp. 1-9.


Document type: Journal Article
Collection: Journal Articles

Title Anisotropic characteristics of turbulence dissipation in swirling flow: A direct numerical simulation study
Author(s) Yang, X
Gui, N
Xie, G
Yan, J
Tu, J
Jiang, S
Year 2015
Journal name Advances in Mathematical Physics
Volume number 2015
Article Number 657620
Start page 1
End page 9
Total pages 9
Publisher Hindawi Publishing Corporation
Abstract This study investigates the anisotropic characteristics of turbulent energy dissipation rate in a rotating jet flow via direct numerical simulation. The turbulent energy dissipation tensor, including its eigenvalues in the swirling flows with different rotating velocities, is analyzed to investigate the anisotropic characteristics of turbulence and dissipation. In addition, the probability density function of the eigenvalues of turbulence dissipation tensor is presented. The isotropic subrange of PDF always exists in swirling flows relevant to small-scale vortex structure. Thus, with remarkable large-scale vortex breakdown, the isotropic subrange of PDF is reduced in strongly swirling flows, and anisotropic energy dissipation is proven to exist in the core region of the vortex breakdown. More specifically, strong anisotropic turbulence dissipation occurs concentratively in the vortex breakdown region, whereas nearly isotropic turbulence dissipation occurs dispersively in the peripheral region of the strong swirling flows.
Subject Mathematical Sciences not elsewhere classified
DOI - identifier 10.1155/2015/657620
Copyright notice © 2015 Xingtuan Yang et al.
ISSN 1687-9120
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