Highly resolved LES and URANS computations of a differentially heated square cavity
This investigation focusses on the use of two wall-resolved LES approaches for the simulation of the buoyancy driven flow in a differentially heated square cavity, aiming to advance understanding of the flow phenomena involved. The study also assesses the predictive accuracy and cost-effectiveness o...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2024-02-01
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| Series: | International Journal of Thermofluids |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666202724000065 |
| _version_ | 1797306858566844416 |
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| author | Constantinos Katsamis Tim Craft Hector Iacovides Juan Uribe |
| author_facet | Constantinos Katsamis Tim Craft Hector Iacovides Juan Uribe |
| author_sort | Constantinos Katsamis |
| collection | DOAJ |
| description | This investigation focusses on the use of two wall-resolved LES approaches for the simulation of the buoyancy driven flow in a differentially heated square cavity, aiming to advance understanding of the flow phenomena involved. The study also assesses the predictive accuracy and cost-effectiveness of LES for natural convection flows. This assessment is pursued through comparisons of the resulting predictions, and also of their computational requirements, with those for DNS, produced in an earlier study, and those of a number of URANS models produced during the current investigation. URANS models tested here include both high- and low-Reynolds-number schemes. In the case of the high-Reynolds-number models a recently developed numerical variant of the Analytical Wall Function (AWF) has been employed to account for the effects of near-wall turbulence. Both LES approaches result in predictions that are close to those of the DNS but have considerably more modest resource requirements. The URANS approaches, which have the lowest resource requirements, for key parameters such as the local Nusselt number are not as accurate as the LES approaches and their performance is highly dependent on the turbulence model employed. Surprisingly, the simplest of the low-Re models employed, the Launder–Sharma two-equation model, is reasonably close to the DNS data. The approach that requires the least computational resource, the high-Re model with the recent version of the AWF, also offers a promising URANS route. Simulations were also conducted to investigate the flow behaviour at a Rayleigh number that is an order of magnitude higher than that of the available DNS. At such high Rayleigh number, at which the phenomena are of close relevance to cooling loops of nuclear reactors, comparisons are performed between the LES and the high-Re AWF combination. The findings show that as the Rayleigh number increases, the turbulence levels become stronger, but these are confined to more refined structures within the thinner near-wall boundary layers. |
| first_indexed | 2024-03-08T00:47:55Z |
| format | Article |
| id | doaj.art-4d7d84c5d45b4413bc110a12eb96233e |
| institution | Directory Open Access Journal |
| issn | 2666-2027 |
| language | English |
| last_indexed | 2024-03-08T00:47:55Z |
| publishDate | 2024-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Thermofluids |
| spelling | doaj.art-4d7d84c5d45b4413bc110a12eb96233e2024-02-15T05:25:36ZengElsevierInternational Journal of Thermofluids2666-20272024-02-0121100564Highly resolved LES and URANS computations of a differentially heated square cavityConstantinos Katsamis0Tim Craft1Hector Iacovides2Juan Uribe3Thermo-Fluids Research Group, School of Engineering, The University of Manchester, Manchester, M13 9PL, United Kingdom; Corresponding author.Thermo-Fluids Research Group, School of Engineering, The University of Manchester, Manchester, M13 9PL, United KingdomThermo-Fluids Research Group, School of Engineering, The University of Manchester, Manchester, M13 9PL, United KingdomEDF Energy R&D UK Centre, Manchester, United KingdomThis investigation focusses on the use of two wall-resolved LES approaches for the simulation of the buoyancy driven flow in a differentially heated square cavity, aiming to advance understanding of the flow phenomena involved. The study also assesses the predictive accuracy and cost-effectiveness of LES for natural convection flows. This assessment is pursued through comparisons of the resulting predictions, and also of their computational requirements, with those for DNS, produced in an earlier study, and those of a number of URANS models produced during the current investigation. URANS models tested here include both high- and low-Reynolds-number schemes. In the case of the high-Reynolds-number models a recently developed numerical variant of the Analytical Wall Function (AWF) has been employed to account for the effects of near-wall turbulence. Both LES approaches result in predictions that are close to those of the DNS but have considerably more modest resource requirements. The URANS approaches, which have the lowest resource requirements, for key parameters such as the local Nusselt number are not as accurate as the LES approaches and their performance is highly dependent on the turbulence model employed. Surprisingly, the simplest of the low-Re models employed, the Launder–Sharma two-equation model, is reasonably close to the DNS data. The approach that requires the least computational resource, the high-Re model with the recent version of the AWF, also offers a promising URANS route. Simulations were also conducted to investigate the flow behaviour at a Rayleigh number that is an order of magnitude higher than that of the available DNS. At such high Rayleigh number, at which the phenomena are of close relevance to cooling loops of nuclear reactors, comparisons are performed between the LES and the high-Re AWF combination. The findings show that as the Rayleigh number increases, the turbulence levels become stronger, but these are confined to more refined structures within the thinner near-wall boundary layers.http://www.sciencedirect.com/science/article/pii/S2666202724000065TurbulenceBuoyant square cavityLESUnsteady RANSAnalytical wall function |
| spellingShingle | Constantinos Katsamis Tim Craft Hector Iacovides Juan Uribe Highly resolved LES and URANS computations of a differentially heated square cavity International Journal of Thermofluids Turbulence Buoyant square cavity LES Unsteady RANS Analytical wall function |
| title | Highly resolved LES and URANS computations of a differentially heated square cavity |
| title_full | Highly resolved LES and URANS computations of a differentially heated square cavity |
| title_fullStr | Highly resolved LES and URANS computations of a differentially heated square cavity |
| title_full_unstemmed | Highly resolved LES and URANS computations of a differentially heated square cavity |
| title_short | Highly resolved LES and URANS computations of a differentially heated square cavity |
| title_sort | highly resolved les and urans computations of a differentially heated square cavity |
| topic | Turbulence Buoyant square cavity LES Unsteady RANS Analytical wall function |
| url | http://www.sciencedirect.com/science/article/pii/S2666202724000065 |
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