TY - JOUR
T1 - Anisotropic characteristics of turbulence dissipation in swirling flow
T2 - A direct numerical simulation study
AU - Yang, Xingtuan
AU - Gui, Nan
AU - Xie, Gongnan
AU - Yan, Jie
AU - Tu, Jiyuan
AU - Jiang, Shengyao
N1 - Publisher Copyright:
© 2015 Xingtuan Yang et al.
PY - 2015
Y1 - 2015
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84925430973&partnerID=8YFLogxK
U2 - 10.1155/2015/657620
DO - 10.1155/2015/657620
M3 - 文章
AN - SCOPUS:84925430973
SN - 1687-9120
VL - 2015
JO - Advances in Mathematical Physics
JF - Advances in Mathematical Physics
M1 - 657620
ER -