Unsteady Numerical Simulation of Two-Dimensional Airflow over a Square Cross-Section at High Reynolds Numbers as a Reduced Model of Wind Actions on Buildings
Airflow over a square cross-section at high Reynolds numbers and different angles of incidence is investigated with the aim of providing deeper insight into wind actions on elongated structures and, in particular, tall buildings. The flow around bluff bodies is characterized by separation at sharp c...
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| Format: | Article |
| Language: | English |
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MDPI AG
2024-02-01
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| Series: | Buildings |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-5309/14/3/561 |
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| author | Aggelos C. Karvelis Athanassios A. Dimas Charis J. Gantes |
| author_facet | Aggelos C. Karvelis Athanassios A. Dimas Charis J. Gantes |
| author_sort | Aggelos C. Karvelis |
| collection | DOAJ |
| description | Airflow over a square cross-section at high Reynolds numbers and different angles of incidence is investigated with the aim of providing deeper insight into wind actions on elongated structures and, in particular, tall buildings. The flow around bluff bodies is characterized by separation at sharp corners, as well as possible flow reattachment at side surfaces. The alternate shedding of vortices is also generated in the wake of bluff bodies due to the unsteady nature of flow separation. Two-dimensional (2D) URANS numerical simulations were conducted in order to model transient flow and examine wind actions on a square used as a model of a typical cross-section of a tall building far from its roof and the ground. For validation purposes, the study’s numerical results on drag and lift coefficients, Strouhal numbers, as well as pressure coefficient distribution were found to be in good agreement with available experimental and numerical results in the literature for relatively low Reynolds numbers. The numerical study was then extended to higher Reynolds numbers, approaching values that are pertinent for wind flow around buildings, thus addressing the lack of such results in the literature. On the basis of these results, the impact of Reynolds numbers and angles of incidence on drag and lift coefficients, as well as the pressure coefficient distribution along the walls of the cross-section, is highlighted. |
| first_indexed | 2024-04-24T18:28:49Z |
| format | Article |
| id | doaj.art-29e9da6042f347f2b6288d1f9705a9b0 |
| institution | Directory Open Access Journal |
| issn | 2075-5309 |
| language | English |
| last_indexed | 2024-04-24T18:28:49Z |
| publishDate | 2024-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Buildings |
| spelling | doaj.art-29e9da6042f347f2b6288d1f9705a9b02024-03-27T13:28:54ZengMDPI AGBuildings2075-53092024-02-0114356110.3390/buildings14030561Unsteady Numerical Simulation of Two-Dimensional Airflow over a Square Cross-Section at High Reynolds Numbers as a Reduced Model of Wind Actions on BuildingsAggelos C. Karvelis0Athanassios A. Dimas1Charis J. Gantes2Institute of Steel Structures, National Technical University of Athens, GR-15780 Athens, GreeceHydraulic Engineering Laboratory, Department of Civil Engineering, University of Patras, GR-26504 Rio, GreeceInstitute of Steel Structures, National Technical University of Athens, GR-15780 Athens, GreeceAirflow over a square cross-section at high Reynolds numbers and different angles of incidence is investigated with the aim of providing deeper insight into wind actions on elongated structures and, in particular, tall buildings. The flow around bluff bodies is characterized by separation at sharp corners, as well as possible flow reattachment at side surfaces. The alternate shedding of vortices is also generated in the wake of bluff bodies due to the unsteady nature of flow separation. Two-dimensional (2D) URANS numerical simulations were conducted in order to model transient flow and examine wind actions on a square used as a model of a typical cross-section of a tall building far from its roof and the ground. For validation purposes, the study’s numerical results on drag and lift coefficients, Strouhal numbers, as well as pressure coefficient distribution were found to be in good agreement with available experimental and numerical results in the literature for relatively low Reynolds numbers. The numerical study was then extended to higher Reynolds numbers, approaching values that are pertinent for wind flow around buildings, thus addressing the lack of such results in the literature. On the basis of these results, the impact of Reynolds numbers and angles of incidence on drag and lift coefficients, as well as the pressure coefficient distribution along the walls of the cross-section, is highlighted.https://www.mdpi.com/2075-5309/14/3/561wind action on buildingsdesign wind pressure coefficientsaerodynamic coefficientsbluff bodysquare cylinderCFD |
| spellingShingle | Aggelos C. Karvelis Athanassios A. Dimas Charis J. Gantes Unsteady Numerical Simulation of Two-Dimensional Airflow over a Square Cross-Section at High Reynolds Numbers as a Reduced Model of Wind Actions on Buildings Buildings wind action on buildings design wind pressure coefficients aerodynamic coefficients bluff body square cylinder CFD |
| title | Unsteady Numerical Simulation of Two-Dimensional Airflow over a Square Cross-Section at High Reynolds Numbers as a Reduced Model of Wind Actions on Buildings |
| title_full | Unsteady Numerical Simulation of Two-Dimensional Airflow over a Square Cross-Section at High Reynolds Numbers as a Reduced Model of Wind Actions on Buildings |
| title_fullStr | Unsteady Numerical Simulation of Two-Dimensional Airflow over a Square Cross-Section at High Reynolds Numbers as a Reduced Model of Wind Actions on Buildings |
| title_full_unstemmed | Unsteady Numerical Simulation of Two-Dimensional Airflow over a Square Cross-Section at High Reynolds Numbers as a Reduced Model of Wind Actions on Buildings |
| title_short | Unsteady Numerical Simulation of Two-Dimensional Airflow over a Square Cross-Section at High Reynolds Numbers as a Reduced Model of Wind Actions on Buildings |
| title_sort | unsteady numerical simulation of two dimensional airflow over a square cross section at high reynolds numbers as a reduced model of wind actions on buildings |
| topic | wind action on buildings design wind pressure coefficients aerodynamic coefficients bluff body square cylinder CFD |
| url | https://www.mdpi.com/2075-5309/14/3/561 |
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