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Large-Eddy Simulations of Thermal Ribbed Duct Flows

Garg, Himani LU orcid ; Wang, Lei LU and Fureby, Christer LU (2024) p.203-218
Abstract
Ribbed channel flows are encountered in numerous engineering applications to promote turbulence and enhance heat transfer in various cooling passages, e.g., in turbine blades and at combustor walls. Numerical simulations have become an increasingly useful tool for providing insights into complex turbulence and flow separation, which are critical to the design and optimization of such channels. In this numerical study we use the experimental case of Wang, [1, 2], as a reference set-up for thermal ribbed duct flows in the fully developed turbulent flow regime of 4000 ≤ Re ≤ 24000, where Re is the Reynolds number. Wang, [1, 2], performed detailed, non-intrusive, experimental studies to characterize the turbulent flow and its impact on the... (More)
Ribbed channel flows are encountered in numerous engineering applications to promote turbulence and enhance heat transfer in various cooling passages, e.g., in turbine blades and at combustor walls. Numerical simulations have become an increasingly useful tool for providing insights into complex turbulence and flow separation, which are critical to the design and optimization of such channels. In this numerical study we use the experimental case of Wang, [1, 2], as a reference set-up for thermal ribbed duct flows in the fully developed turbulent flow regime of 4000 ≤ Re ≤ 24000, where Re is the Reynolds number. Wang, [1, 2], performed detailed, non-intrusive, experimental studies to characterize the turbulent flow and its impact on the thermal performance, thus providing an experimental data base against which numerical simulations based on Reynolds Averaged Navier Stokes (RANS) and Large Eddy Simulations (LES) can be validated. In this paper we specifically report on RANS and LES, using different turbulence models, subgrid models, and grids, at Re=4000, 8000, 12000, 16000, 22000, and 24000, using a code developed within openFoam, [3]. The turbulence models include the RANS k-∊ and k-ω SST models, and the LES subgrid models include Smagorinsky (SMG), One Equation Eddy Viscosity (OEEVM), Wall-Adapting Local Eddy viscosity (WALE), and Localized Dynamic K Equation (LDKM) models, whereas the grid sizes range from 1.0 to 25.0 million cells, resolving between 86% and 94% of the turbulent kinetic energy, suggesting that all grids are acceptable for LES. The LES results are generally in better agreement with the experimental data than the RANS results. The LES using the WALE and LDKM models are also in closer agreement with the experimental data than the LES using the SMG and OEEVM models. The LES also reveal a highly unsteady and very complex flow between and above the ribs. (Less)
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author
; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
Cambridge Unsteady Flow Symposium 2024
editor
Tyacke, James and Rao Vadlamani, Nagabhushana
pages
16 pages
publisher
Springer
ISBN
9783031690346
9783031690341
DOI
10.1007/978-3-031-69035-8_12
language
English
LU publication?
yes
id
6d371fb4-9113-49b6-80ea-a0ce9fa3fd51
date added to LUP
2024-07-29 16:59:27
date last changed
2025-04-04 14:29:37
@inproceedings{6d371fb4-9113-49b6-80ea-a0ce9fa3fd51,
  abstract     = {{Ribbed channel flows are encountered in numerous engineering applications to promote turbulence and enhance heat transfer in various cooling passages, e.g., in turbine blades and at combustor walls. Numerical simulations have become an increasingly useful tool for providing insights into complex turbulence and flow separation, which are critical to the design and optimization of such channels. In this numerical study we use the experimental case of Wang, [1, 2], as a reference set-up for thermal ribbed duct flows in the fully developed turbulent flow regime of 4000 ≤ Re ≤ 24000, where Re is the Reynolds number. Wang, [1, 2], performed detailed, non-intrusive, experimental studies to characterize the turbulent flow and its impact on the thermal performance, thus providing an experimental data base against which numerical simulations based on Reynolds Averaged Navier Stokes (RANS) and Large Eddy Simulations (LES) can be validated. In this paper we specifically report on RANS and LES, using different turbulence models, subgrid models, and grids, at Re=4000, 8000, 12000, 16000, 22000, and 24000, using a code developed within openFoam, [3]. The turbulence models include the RANS k-∊ and k-ω SST models, and the LES subgrid models include Smagorinsky (SMG), One Equation Eddy Viscosity (OEEVM), Wall-Adapting Local Eddy viscosity (WALE), and Localized Dynamic K Equation (LDKM) models, whereas the grid sizes range from 1.0 to 25.0 million cells, resolving between 86% and 94% of the turbulent kinetic energy, suggesting that all grids are acceptable for LES. The LES results are generally in better agreement with the experimental data than the RANS results. The LES using the WALE and LDKM models are also in closer agreement with the experimental data than the LES using the SMG and OEEVM models. The LES also reveal a highly unsteady and very complex flow between and above the ribs.}},
  author       = {{Garg, Himani and Wang, Lei and Fureby, Christer}},
  booktitle    = {{Cambridge Unsteady Flow Symposium 2024}},
  editor       = {{Tyacke, James and Rao Vadlamani, Nagabhushana}},
  isbn         = {{9783031690346}},
  language     = {{eng}},
  pages        = {{203--218}},
  publisher    = {{Springer}},
  title        = {{Large-Eddy Simulations of Thermal Ribbed Duct Flows}},
  url          = {{http://dx.doi.org/10.1007/978-3-031-69035-8_12}},
  doi          = {{10.1007/978-3-031-69035-8_12}},
  year         = {{2024}},
}