LARGE EDDY SIMULATIONS OF ROUND FREE JETS USING EXPLICIT FILTERING WITH/WITHOUT DYNAMIC SMAGORINSKY MODEL

By Christophe Bogey, Christophe Bailly. Proceeding of Fourth International Symposium on Turbulence and Shear Flow Phenomena, 2006

135 citations recorded by the source corpus.

Abstract Large eddy simulations (LES) of round free jets at Mach number M = 0.9 with Reynolds numbers over the range 2.5 × 10 3 ⩽ Re D ⩽ 4 × 10 5 are performed using explicit selective/high-order filtering with or without dynamic Smagorinsky model (DSM). Features of the flows and of the turbulent kinetic energy budgets in the turbulent jets are reported. The contributions of molecular viscosity, filtering and DSM to energy dissipation are also presented. Using filtering alone, the results are independent of the filtering strength, and the effects of the Reynolds number on jet development are successfully calculated. Using DSM, the effective jet Reynolds number is found to be artificially decreased by the eddy viscosity. The results are also not appreciably modified when subgrid-scale kinetic energy is used. Moreover, unlike filtering which does not significantly affect the larger computed scales, the eddy viscosity is shown to dissipate energy through all the turbulent scales, in the same way as molecular viscosity at lower Reynolds numbers.

Subfields: Aerospace Engineering, Computational Mechanics

View Paper: https://www.semanticscholar.org/paper/b221159ee3c94a72a5f8bb1e4a723667728325a6

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Citations in the corpus

Turbulence and energy budget in a self-preserving round jet: direct evaluation using large eddy simulation (2009, methodology): “…axial integral length scale is evaluated from the law Lf = 0.0385x observed experimentally in Wygnanski & Fiedler (1969) as well as numerically in Bogey & Bailly (2006d), while the transverse Taylor scale and the Kolmogorov scale are calculated using the relations of isotropic turbulence, which…”
An analysis of the correlations between the turbulent flow and the sound pressure fields of subsonic jets (2007, methodology): “The effects of the Mach and Reynolds numbers on the noise radiated by jets at Mach numbers 0.6 and 0.9, with Reynolds numbers varying from 1700 up to 4 × 105, were then described in Bogey & Bailly (2006b).”
Influence of nozzle-exit boundary-layer conditions on the flow and acoustic fields of initially laminar jets (2010, methodology): “This may be due to Mach number effects, as suggested by experimental data of Juvé & Sunyach (1978) and simulation results of Bogey & Bailly (2006a).”