Assessment of Hybrid RANS/LES Models in Heat and Fluid Flows around Staggered Pin-Fin Arrays
In the present work, the three-dimensional heat and fluid flows around staggered pin-fin arrays are predicted using two hybrid RANS/LES models (an improved delayed detached eddy simulation (IDDES) model and a stress-blended eddy simulation (SBES) model), and one transitional unsteady Reynolds averag...
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doaj-7d3396de4da54d898e38b5be77baefc12020-11-25T02:49:17ZengMDPI AGEnergies1996-10732020-07-01133752375210.3390/en13143752Assessment of Hybrid RANS/LES Models in Heat and Fluid Flows around Staggered Pin-Fin ArraysByeong-Cheon Kim0Kyoungsik Chang1Department of Mechanical Engineering, University of Ulsan, Ulsan 44610, KoreaDepartment of Mechanical Engineering, University of Ulsan, Ulsan 44610, KoreaIn the present work, the three-dimensional heat and fluid flows around staggered pin-fin arrays are predicted using two hybrid RANS/LES models (an improved delayed detached eddy simulation (IDDES) model and a stress-blended eddy simulation (SBES) model), and one transitional unsteady Reynolds averaged Navier-Stokes (URANS) model, called k-ω SSTLM. The periodic segment geometry with a total of nine pins is considered with a channel height of 2D and a distance of 2.5D between each pin. The corresponding Reynolds number based on the pin diameter and the maximum velocity between pins is 10,000. The two hybrid RANS/LES results show the superior prediction of the mean velocity profiles around the pins, pressure distributions on the pin wall, and Nusselt number distributions. However, the transitional model, k-ω SSTLM, shows large discrepancies except in front of the pins where the flow is not fully developed. The vortical structures are well resolved by the two hybrid RANS/LES models. The SBES model is particularly adept at capturing the 3-D vortex structures after the pins. The effects of the blending function switching between RANS and LES mode of the two hybrid RANS/LES models are also investigated.https://www.mdpi.com/1996-1073/13/14/3752staggered pin-fin arraysimproved delayed detached eddy simulation (IDDES)stress-blended eddy simulation (SBES)hybrid RANS/LESk-ω SSTLM |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Byeong-Cheon Kim Kyoungsik Chang |
spellingShingle |
Byeong-Cheon Kim Kyoungsik Chang Assessment of Hybrid RANS/LES Models in Heat and Fluid Flows around Staggered Pin-Fin Arrays Energies staggered pin-fin arrays improved delayed detached eddy simulation (IDDES) stress-blended eddy simulation (SBES) hybrid RANS/LES k-ω SSTLM |
author_facet |
Byeong-Cheon Kim Kyoungsik Chang |
author_sort |
Byeong-Cheon Kim |
title |
Assessment of Hybrid RANS/LES Models in Heat and Fluid Flows around Staggered Pin-Fin Arrays |
title_short |
Assessment of Hybrid RANS/LES Models in Heat and Fluid Flows around Staggered Pin-Fin Arrays |
title_full |
Assessment of Hybrid RANS/LES Models in Heat and Fluid Flows around Staggered Pin-Fin Arrays |
title_fullStr |
Assessment of Hybrid RANS/LES Models in Heat and Fluid Flows around Staggered Pin-Fin Arrays |
title_full_unstemmed |
Assessment of Hybrid RANS/LES Models in Heat and Fluid Flows around Staggered Pin-Fin Arrays |
title_sort |
assessment of hybrid rans/les models in heat and fluid flows around staggered pin-fin arrays |
publisher |
MDPI AG |
series |
Energies |
issn |
1996-1073 |
publishDate |
2020-07-01 |
description |
In the present work, the three-dimensional heat and fluid flows around staggered pin-fin arrays are predicted using two hybrid RANS/LES models (an improved delayed detached eddy simulation (IDDES) model and a stress-blended eddy simulation (SBES) model), and one transitional unsteady Reynolds averaged Navier-Stokes (URANS) model, called k-ω SSTLM. The periodic segment geometry with a total of nine pins is considered with a channel height of 2D and a distance of 2.5D between each pin. The corresponding Reynolds number based on the pin diameter and the maximum velocity between pins is 10,000. The two hybrid RANS/LES results show the superior prediction of the mean velocity profiles around the pins, pressure distributions on the pin wall, and Nusselt number distributions. However, the transitional model, k-ω SSTLM, shows large discrepancies except in front of the pins where the flow is not fully developed. The vortical structures are well resolved by the two hybrid RANS/LES models. The SBES model is particularly adept at capturing the 3-D vortex structures after the pins. The effects of the blending function switching between RANS and LES mode of the two hybrid RANS/LES models are also investigated. |
topic |
staggered pin-fin arrays improved delayed detached eddy simulation (IDDES) stress-blended eddy simulation (SBES) hybrid RANS/LES k-ω SSTLM |
url |
https://www.mdpi.com/1996-1073/13/14/3752 |
work_keys_str_mv |
AT byeongcheonkim assessmentofhybridranslesmodelsinheatandfluidflowsaroundstaggeredpinfinarrays AT kyoungsikchang assessmentofhybridranslesmodelsinheatandfluidflowsaroundstaggeredpinfinarrays |
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