Anisotropic Characteristics of Turbulence Dissipation in Swirling Flow: A Direct Numerical Simulation Study

作者：Yang, Xingtuan; Gui, Nan; Xie, Gongnan; Yan, Jie; Tu, Jiyuan; Jiang, Shengyao^*

来源：Advances in Mathematical Physics, 2015, 2015: 1-9.

DOI：10.1155/2015/657620

• VORTEX BREAKDOWN
• JETS

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.

• 出版日期2015
• 单位中国空间技术研究院; 西北工业大学; 中国石油大学（北京）