Direct numerical simulations of temporal compressible mixing layers in a Bethe–Zel'dovich–Thompson dense gas: influence of the convective Mach number
| Autor: | Christophe Eric Corre, Alexis Giauque, Aurélien Vadrot |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
Convection Turbulence Mechanical Engineering Mechanics Condensed Matter Physics Boundary layer thickness 01 natural sciences Isothermal process 010305 fluids & plasmas symbols.namesake Mach number Mechanics of Materials 0103 physical sciences Compressibility symbols 010306 general physics Mixing (physics) Large eddy simulation |
| Zdroj: | Journal of Fluid Mechanics. 922 |
| ISSN: | 1469-7645 0022-1120 |
| DOI: | 10.1017/jfm.2021.511 |
| Popis: | The present article investigates the effects of a BZT (Bethe–Zel'dovich–Thompson) dense gas (FC-70) on the development of turbulent compressible mixing layers at three different convective Mach numbers . The well-known compressibility-related decrease of the momentum thickness growth rate is reduced in the dense gas. Fluctuating thermodynamics quantities are strongly modified. In particular, temperature variations are suppressed, leading to an almost isothermal evolution. The small scales dynamics is also influenced by dense gas effects, which calls for a specific sub-grid-scale model when computing dense gas flows using large eddy simulation. Additional dense gas DNS are performed at three other initial thermodynamic operating points. DNS performed outside and inside the BZT inversion region do not show major differences. BZT effects themselves therefore only have a small impact on the mixing layer growth. |
| Databáze: | OpenAIRE |
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