Samenvatting
Large eddy simulation (LES) is widely used to investigate the aerodynamics and convective heat transfer (CHT) at the surfaces of sharp-edged bluff bodies for a wide range of Reynolds (Re) numbers. Due to the heavy computational costs associated with implicit filtering in LES at high Reynolds number flows (Re ≥ 105), wall-modeled (WM) rather than wall-resolved (WR) LES is often adopted. However, the performance of LES-WM for such applications has not yet been systematically investigated. Therefore, this study evaluates the performance of LES-WM and LES-WR for the flow and thermal field at the facades of a low-rise building immersed in an atmospheric boundary layer. Four grids are constructed for LES-WM, each employing different resolution at the building surfaces reaching maximum non-dimensional wall distance y+ = 43, 57, 70, and 95. In addition, the performance of two wall functions, namely the Werner and Wengle and the enhanced wall function is investigated. The results show that the use of LES-WM can result in significant deviations in the predicted near-facade flow pattern and the surface convective heat transfer coefficient (CHTC). Grid resolution significantly impacts the CHTC results and deviations go up to 88% (at the base of the windward facade). Considerable deviations among the employed wall functions are apparent only on the finest grid. In this case, the implementation of the enhanced wall function indicates better performance compared to the non-blended law of the wall (combined with the Werner and Wengle) for CHTC in the regions of the leeward facade where the flow remains attached to the wall. The deviation of the enhanced wall function for surface-averaged CHTC is found to be 10.8% against the wall-resolved LES results, while for the non-blended law of the wall this is 19.2%.
| Originele taal-2 | Engels |
|---|---|
| Artikelnummer | 110678 |
| Aantal pagina's | 21 |
| Tijdschrift | Building and Environment |
| Volume | 244 |
| DOI's | |
| Status | Gepubliceerd - 1 okt. 2023 |
Bibliografische nota
Funding Information:The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Samy Iousef reports financial support was provided by Heijmans BV. Samy Iousef reports financial support was provided by Nederlandse Organisatie voor Wetenschappelijk Onderzoek.The research is financially supported by the PhD Impulse Program of Eindhoven University of Technology in collaboration with the construction company Heijmans B.V. the Netherlands. It was also sponsored by NWO Exacte Wetenschappen (Physical Sciences) for the use of supercomputer facilities, with financial support from the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (Netherlands Organization for Scientific Research, NWO). The authors also gratefully acknowledge the partnership with ANSYS CFD.
Funding Information:
The research is financially supported by the PhD Impulse Program of Eindhoven University of Technology in collaboration with the construction company Heijmans B.V., the Netherlands . It was also sponsored by NWO Exacte Wetenschappen (Physical Sciences) for the use of supercomputer facilities, with financial support from the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (Netherlands Organization for Scientific Research, NWO) . The authors also gratefully acknowledge the partnership with ANSYS CFD.
Financiering
The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Samy Iousef reports financial support was provided by Heijmans BV. Samy Iousef reports financial support was provided by Nederlandse Organisatie voor Wetenschappelijk Onderzoek.The research is financially supported by the PhD Impulse Program of Eindhoven University of Technology in collaboration with the construction company Heijmans B.V. the Netherlands. It was also sponsored by NWO Exacte Wetenschappen (Physical Sciences) for the use of supercomputer facilities, with financial support from the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (Netherlands Organization for Scientific Research, NWO). The authors also gratefully acknowledge the partnership with ANSYS CFD. The research is financially supported by the PhD Impulse Program of Eindhoven University of Technology in collaboration with the construction company Heijmans B.V., the Netherlands . It was also sponsored by NWO Exacte Wetenschappen (Physical Sciences) for the use of supercomputer facilities, with financial support from the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (Netherlands Organization for Scientific Research, NWO) . The authors also gratefully acknowledge the partnership with ANSYS CFD.