In order to assess the specific characteristics of turbulence in dense gas flows with respect to ideal gas flows, Direct Numerical Simulations are performed for both FC-70 described using Martin-Hou Equation of State (EoS) and a reference ideal gas, in the case of a forced Homogeneous Isotropic Turbulence (HIT) configuration and of a temporal compressible mixing layer configuration. The forced HIT shows that the statistically stationary turbulent kinetic energy (TKE) spectrum follows quite closely the one obtained in the incompressible case even when the turbulent Mach number is large. It is shown that the weakening of compressible dissipation of the TKE can be related to the decoupling of the density fluctuations from the velocity as well as to the strong weakening of compression shocklets in the dense gas case. The mixing layer case at a convective Mach number \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$M_c=1.1$$\end{document} shows that the well-known compressibility-related reduction of the mixing layer momentum thickness growth rate is not significantly influenced by the EoS. Yet the unstable growth leading to the self-similarity phase is enhanced by the dense gas thermodynamics.
Direct Numerical Simulation of Turbulent Dense Gas Flows
Lect.Notes Mechanical Engineering
International Seminar on Non-Ideal Compressible-Fluid Dynamics for Propulsion & Power ; 2018 ; Bochum, Germany October 04, 2018 - October 05, 2018
2020-07-09
12 pages
Article/Chapter (Book)
Electronic Resource
English
Direct Numerical Simulation of Turbulent Flows Using Spectral Method
British Library Conference Proceedings | 2008
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