Shock–turbulence interactions at high turbulence intensities
Autor: | Diego Donzis, Chang-Hsin Chen |
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Rok vydání: | 2019 |
Předmět: |
Physics
Shock wave Shock (fluid dynamics) Turbulence Mechanical Engineering Flow (psychology) Forcing (mathematics) Mechanics Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas symbols.namesake Mach number Mechanics of Materials 0103 physical sciences symbols 010306 general physics Compressible turbulence Anisotropy |
Zdroj: | Journal of Fluid Mechanics. 870:813-847 |
ISSN: | 1469-7645 0022-1120 |
DOI: | 10.1017/jfm.2019.248 |
Popis: | Shock–turbulence interactions are investigated using well-resolved direct numerical simulations (DNS) and analysis at a range of Reynolds, mean and turbulent Mach numbers ($R_{\unicode[STIX]{x1D706}}$, $M$ and $M_{t}$, respectively). The simulations are shock and turbulence resolving with $R_{\unicode[STIX]{x1D706}}$ up to 65, $M_{t}$ up to 0.54 and $M$ up to 1.4. The focus is on the effect of strong turbulence on the jumps of mean thermodynamic variables across the shock, the shock structure and the amplification of turbulence as it moves through the shock. Theoretical results under the so-called quasi-equilibrium (QE) assumption provide explicit laws for a number of statistics of interests which are in agreement with the new DNS data presented here as well as all the data available in the literature. While in previous studies turbulence was found to weaken jumps, it is shown here that stronger jumps are also observed depending on the regime of the interaction. Statistics of the dilatation at the shock are also investigated and found to be well represented by QE for weak turbulence but saturate at high turbulence intensities with a Reynolds number dependence also captured by the analysis. Finally, amplification factors are found to present a universal behaviour with two limiting asymptotic regimes governed by $(M-1)$ and $K=M_{t}/R_{\unicode[STIX]{x1D706}}^{1/2}(M-1)$, for weak and strong turbulence, respectively. Effect of anisotropy in the incoming flow is also assessed by utilizing two different forcing mechanisms to generate turbulence. |
Databáze: | OpenAIRE |
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