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LES and ILES simulations of free-jets

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journal contribution
posted on 2023-03-24, 14:29 authored by Tzuo Wei It Kuan, Joanna SzmelterJoanna Szmelter, Francesco Cocetta

A systematic numerical study was performed to investigate the influence of subgrid-scale (SGS) treatments on the simulation of turbulent free-jets. Large eddy simulations (LES) of such flows were performed to assess the accuracy of two SGS approaches: the detached eddy simulation and the dynamic Smagorinsky model (DSM). The Non-oscillatory Forward in Time-Multidimensional Positive Definite Advection Transport Algorithm (NFT-MPDATA) numerical scheme was employed to integrate the Navier–Stokes equations for incompressible flows. MPDATA due to its self-regularisation property is used to implicitly provide SGS effects. Two options of implicit LES (ILES) are investigated: ILES-NS, which solves the Navier–Stokes equations without an explicit SGS model, and ILES-EU that solves the Euler equations where viscous terms are absent. The performance of each approach was evaluated focusing on key global characteristics of jets, self-similar properties, and energy spectra. Quantitative and qualitative comparisons showed that all simulations were in good agreement with laboratory experiments, prior numerical studies, and each other, thus confirming the validity of the numerical approach and suitability of ILES for this class of flows. Additionally, energy spectra analysis revealed that ILES can reproduce the −5/3−5/3 and −7−7 gradients that signify the universal inertia subrange and dissipation range for turbulent free-jets. 

Funding

Horizon 2020 Research and Innovation Programme (ESCAPE2 grant agreement no. 800897)

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Flow, Turbulence and Combustion

Volume

110

Issue

3

Pages

547-579

Publisher

Springer

Version

  • VoR (Version of Record)

Rights holder

© The Author(s)

Publisher statement

This is an Open Access article published by Springer Nature and is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

Acceptance date

2022-11-21

Publication date

2022-12-07

Copyright date

2022

ISSN

1386-6184

eISSN

1573-1987

Language

  • en

Depositor

Wei It Kuan. Deposit date: 7 December 2022

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