New insight on large-eddy simulation of flow past a circular cylinder at subcritical Reynolds number 3900
Flow past a circular cylinder at the subcritical Reynolds number of 3900 is numerically investigated based on large-eddy simulations (LESs) via the open-source toolbox OpenFOAM. Good grid convergence property is achieved for the present LESs with different subgrid-scale models as far as the near-wak...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
AIP Publishing LLC
2020-08-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/5.0012358 |
| _version_ | 1819039612142616576 |
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| author | Geng Tian Zuoli Xiao |
| author_facet | Geng Tian Zuoli Xiao |
| author_sort | Geng Tian |
| collection | DOAJ |
| description | Flow past a circular cylinder at the subcritical Reynolds number of 3900 is numerically investigated based on large-eddy simulations (LESs) via the open-source toolbox OpenFOAM. Good grid convergence property is achieved for the present LESs with different subgrid-scale models as far as the near-wake statistics are concerned. On the intermediate-resolution grid, current LES data in terms of mean flow and turbulence quantities are in good agreement with the benchmark experimental results. A comparison study on the Smagorinsky model manifests that increasing the model coefficient results in a longer recirculation length and smaller drag and lift coefficients. The budget analysis of the turbulent kinetic energy (TKE) equation suggests that the main source in the wake area is the TKE production, which is transported downstream mainly through the advection by mean flow and further moved upward and downward through the transport terms. The flow patterns indicate that the weak production rates induced by the shear layers delay the downward movement of the mean flow, resulting in a longer recirculation region. This dynamic picture provides a reliable explanation for the differences in the recirculation length and mean flow profiles observed in the near-wake area from different experimental and numerical studies. |
| first_indexed | 2024-12-21T08:55:58Z |
| format | Article |
| id | doaj.art-c990f96d00204cb391fad5dd1e14094a |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-12-21T08:55:58Z |
| publishDate | 2020-08-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-c990f96d00204cb391fad5dd1e14094a2022-12-21T19:09:33ZengAIP Publishing LLCAIP Advances2158-32262020-08-01108085321085321-1710.1063/5.0012358New insight on large-eddy simulation of flow past a circular cylinder at subcritical Reynolds number 3900Geng Tian0Zuoli Xiao1State Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing 100871, People’s Republic of ChinaState Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing 100871, People’s Republic of ChinaFlow past a circular cylinder at the subcritical Reynolds number of 3900 is numerically investigated based on large-eddy simulations (LESs) via the open-source toolbox OpenFOAM. Good grid convergence property is achieved for the present LESs with different subgrid-scale models as far as the near-wake statistics are concerned. On the intermediate-resolution grid, current LES data in terms of mean flow and turbulence quantities are in good agreement with the benchmark experimental results. A comparison study on the Smagorinsky model manifests that increasing the model coefficient results in a longer recirculation length and smaller drag and lift coefficients. The budget analysis of the turbulent kinetic energy (TKE) equation suggests that the main source in the wake area is the TKE production, which is transported downstream mainly through the advection by mean flow and further moved upward and downward through the transport terms. The flow patterns indicate that the weak production rates induced by the shear layers delay the downward movement of the mean flow, resulting in a longer recirculation region. This dynamic picture provides a reliable explanation for the differences in the recirculation length and mean flow profiles observed in the near-wake area from different experimental and numerical studies.http://dx.doi.org/10.1063/5.0012358 |
| spellingShingle | Geng Tian Zuoli Xiao New insight on large-eddy simulation of flow past a circular cylinder at subcritical Reynolds number 3900 AIP Advances |
| title | New insight on large-eddy simulation of flow past a circular cylinder at subcritical Reynolds number 3900 |
| title_full | New insight on large-eddy simulation of flow past a circular cylinder at subcritical Reynolds number 3900 |
| title_fullStr | New insight on large-eddy simulation of flow past a circular cylinder at subcritical Reynolds number 3900 |
| title_full_unstemmed | New insight on large-eddy simulation of flow past a circular cylinder at subcritical Reynolds number 3900 |
| title_short | New insight on large-eddy simulation of flow past a circular cylinder at subcritical Reynolds number 3900 |
| title_sort | new insight on large eddy simulation of flow past a circular cylinder at subcritical reynolds number 3900 |
| url | http://dx.doi.org/10.1063/5.0012358 |
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