Formation of zones of an inverse energy cascade in an axisymmetric jet

Autor:	M. Yu. Khrebtov, B. B. Ilyushin
Rok vydání:	2013
Předmět:	Physics Vortex tube Turbulence Computational Mechanics General Physics and Astronomy Reynolds number Mechanics Physics::Fluid Dynamics symbols.namesake Classical mechanics Eddy Mechanics of Materials Energy flow Energy cascade symbols Axial symmetry Large eddy simulation
Zdroj:	Doklady Physics. 58:107-111
ISSN:	1562-6903 1028-3358
DOI:	10.1134/s1028335813030063
Popis:	The results of investigation into the mechanism of formation of an inverse turbulence energy cascade in an axially symmetric submerged jet based on numerical modeling by the large eddy simulation. The flow structure is calculated using two models of subgrid turbulence in a broad range of Reynolds numbers with the imposed external harmonic low-amplitude perturbation and swirling. Calculations showed that upon imposing swirling, the effect of formation of the inverse cascade is suppressed, while upon imposing the external low-amplitude harmonic perturbations corresponding to the frequency of highest perceptivity, it is enhanced. We can assume that the regions with the inverse turbulence energy flow are formed there where the dynamics of large quasi-2D structures is determined by the mechanisms of combining eddies and involvement processes, while the tension mechanism of vortex tubes is suppressed. It is shown that the balance of these mechanisms can be controlled by means of imposition of low-amplitude harmonic perturbations.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7404c0bd1f283d1e3ea363eff9d71b03 https://doi.org/10.1134/s1028335813030063 Zobrazit plný text záznamu Plný text ve formátu PDF