DNS of turbulent flows of dense gases

1st International Seminar on Non-Ideal Compressible-Fluid Dynamics for Propulsion & Power

物理学;力学

Sciacovelli, L.^1,2 ; Cinnella, P.^1 ; Gloerfelt, X.^1 ; Grasso, F.^1,3

Laboratoire DynFluid, Arts et Métiers ParisTech, Paris

75013, France^1

Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, Bari

70125, Italy^2

Laboratoire DynFluid, Conservatoire National des Arts et Métiers, Paris

75003, France^3

关键词: Compressible turbulence;    Homogeneous isotropic turbulence;    Logarithmic regions;    Supersonic turbulent flow;    Thermodynamic behaviour;    Thermodynamic quantities;    Turbulent mach number;    Velocity profiles;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/821/1/012018/pdf
DOI  :  10.1088/1742-6596/821/1/012018

学科分类：力学，机械学

来源: IOP

【 摘 要 】

The influence of dense gas effects on compressible turbulence is investigated by means of numerical simulations of the decay of compressible homogeneous isotropic turbulence (CHIT) and of supersonic turbulent flows through a plane channel (TCF). For both configurations, a parametric study on the Mach and Reynolds numbers is carried out. The dense gas considered in these parametric studies is PP11, a heavy fluorocarbon. The results are systematically compared to those obtained for a diatomic perfect gas (air). In our computations, the thermodynamic behaviour of the dense gases is modelled by means of the Martin-Hou equation of state. For CHIT cases, initial turbulent Mach numbers up to 1 are analyzed using mesh resolutions up to 5123. For TCF, bulk Mach numbers up to 3 and bulk Reynolds numbers up to 12000 are investigated. Average profiles of the thermodynamic quantities exhibit significant differences with respect to perfect-gas solutions for both of the configurations. For high-Mach CHIT, compressible structures are modified with respect to air, with weaker eddy shocklets and stronger expansions. In TCF, the velocity profiles of dense gas flows are much less sensitive to the Mach number and collapse reasonably well in the logarithmic region without any special need for compressible scalings, unlike the case of air, and the overall flow behaviour is midway between that of a variable-property liquid and that of a gas.