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LES and ILES simulations of free-jets
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 Sma...
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| Format: | Default Article |
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2022
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| Online Access: | https://hdl.handle.net/2134/21689225.v1 |
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| _version_ | 1818165457123803136 |
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| author | Tzuo Wei It Kuan Joanna Szmelter Francesco Cocetta |
| author_facet | Tzuo Wei It Kuan Joanna Szmelter Francesco Cocetta |
| author_sort | Tzuo Wei It Kuan (8064794) |
| collection | Figshare |
| description | 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. |
| format | Default Article |
| id | rr-article-21689225 |
| institution | Loughborough University |
| publishDate | 2022 |
| record_format | Figshare |
| spelling | rr-article-216892252022-12-07T00:00:00Z LES and ILES simulations of free-jets Tzuo Wei It Kuan (8064794) Joanna Szmelter (1250304) Francesco Cocetta (10808994) Engineering Fluids & Plasmas Mechanical Engineering & Transports NFT schemes MPDATA LES ILES SGS treatments Turbulent Jets <p>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. </p> 2022-12-07T00:00:00Z Text Journal contribution 2134/21689225.v1 https://figshare.com/articles/journal_contribution/LES_and_ILES_simulations_of_free-jets/21689225 CC BY 4.0 |
| spellingShingle | Engineering Fluids & Plasmas Mechanical Engineering & Transports NFT schemes MPDATA LES ILES SGS treatments Turbulent Jets Tzuo Wei It Kuan Joanna Szmelter Francesco Cocetta LES and ILES simulations of free-jets |
| title | LES and ILES simulations of free-jets |
| title_full | LES and ILES simulations of free-jets |
| title_fullStr | LES and ILES simulations of free-jets |
| title_full_unstemmed | LES and ILES simulations of free-jets |
| title_short | LES and ILES simulations of free-jets |
| title_sort | les and iles simulations of free-jets |
| topic | Engineering Fluids & Plasmas Mechanical Engineering & Transports NFT schemes MPDATA LES ILES SGS treatments Turbulent Jets |
| url | https://hdl.handle.net/2134/21689225.v1 |