Kinetic energy transfer in compressible homogeneous anisotropic turbulence

Wang，Xiaoning1,2,3,4; Wang，Jianchun1,3,4; Li，Hui2; Chen，Shiyi1,3,4

2021-06-01

10.1103/PhysRevFluids.6.064601

Physical Review Fluids   影响因子和分区

2469-990X

Kinetic energy transfer in compressible homogeneous anisotropic turbulence is studied by numerical simulations of forced anisotropic turbulence (FAT) in a periodic box and homogeneous shear turbulence (HST) at different turbulent Mach numbers Mt and different Taylor Reynolds numbers Reλ. In both FAT and HST, the subgrid-scale (SGS) kinetic energy flux is dominated by the streamwise component at large scales, and tends to be isotropic at small scales. As the turbulent Mach number increases, the compressibility slightly enhances the anisotropy of SGS kinetic energy flux and viscous dissipation. The redistribution of kinetic energy from the streamwise direction to two transverse directions by pressure-strain mainly occurs at large length scales. The kinetic energy transferred from the streamwise component through the pressure-strain is shared unequally by the other two components in HST, which is different from the situation of FAT. In FAT, as the Taylor Reynolds number increases, the total SGS kinetic energy flux and its positive and negative components tend to a Reynolds number asymptotic state at small scales for Reλ≥105. In HST, the positive vertical SGS flux of kinetic energy is significantly enhanced by compression motions, causing the vertical SGS flux component to be larger than the streamwise component at small scales. The interscale energy transfer of the solenoidal mode and dilatational mode is studied by employing Helmholtz decomposition. The dilatational kinetic energy of FAT is nearly isotropic, but that of HST is significantly anisotropic. In HST, the dilatational mode obtains energy not only from the solenoidal mode through nonlinear advection, but also from mean shear by the dilatational production. As the turbulent Mach number increases, the nonlinear advection of HST increases first and then decreases. The dilatational production of HST increases monotonically with the turbulent Mach number, providing the main source of kinetic energy to the dilatational mode at high turbulent Mach number Mt≥0.46.

SCI ; EI

英语

第一

WOS:000657185200003

20212510531832

Advection ; Aerodynamics ; Anisotropy ; Energy transfer ; Kinetic energy ; Mach number ; Reynolds number ; Solenoids ; Turbulence ; Turbulent flow

Fluid Flow, General:631.1 ; Aerodynamics, General:651.1 ; Electric Components:704.1 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Mechanical Variables Measurements:943.2

2-s2.0-85108178253

Scopus

1.Guangdong Provincial Key Laboratory of Turbulence Research and Applications,Center for Complex Flows and Soft Matter Research,Department of Mechanics and Aerospace Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.School of Power and Mechanical Engineering,Wuhan University,Wuhan,430072,China
3.Southern Marine Science and Engineering Guangdong Laboratory,Guangzhou,511458,China
4.Guangdong-Hong Kong-Macao Jt. Lab. for Data-Driven Fluid Mechanics and Engineering Applications,Southern University of Science and Technology,Shenzhen,518055,China

Wang，Xiaoning,Wang，Jianchun,Li，Hui,et al. Kinetic energy transfer in compressible homogeneous anisotropic turbulence[J]. Physical Review Fluids,2021,6(6).

Wang，Xiaoning,Wang，Jianchun,Li，Hui,&Chen，Shiyi.(2021).Kinetic energy transfer in compressible homogeneous anisotropic turbulence.Physical Review Fluids,6(6).

Wang，Xiaoning,et al."Kinetic energy transfer in compressible homogeneous anisotropic turbulence".Physical Review Fluids 6.6(2021).