The similitude of indoor airflow in natural ventilation for a reduced-scale model: Investigation of nonisothermal flow fields by RANS simulation

Jiang, Zitao; Kobayashi, Tomohiro; Yamanaka, Toshio; Sandberg, Mats; Yamasawa, Haruna; Shohei, Miyazawa

doi:https://doi.org/10.1016/j.buildenv.2024.111842

The similitude of indoor airflow in natural ventilation for a reduced-scale model: Investigation of nonisothermal flow fields by RANS simulation

Jiang, Zitao; Kobayashi, Tomohiro; Yamanaka, Toshio et al.

Building and Environment, 2024, 262, 111842

アクセス数:434件（2025-07-10 00:57 集計）

固定URL: https://hdl.handle.net/11094/98169

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タイトル	The similitude of indoor airflow in natural ventilation for a reduced-scale model: Investigation of nonisothermal flow fields by RANS simulation
著者	著者名 Jiang, Zitao
	NRID 1000090580952 1000090580952 ORCID 0000-0003-4956-1274 0000-0003-4956-1274 researchmap permalink tkoba_0151426 tkoba_0151426 Scopus Author ID 55724294200 55724294200 著者名 Kobayashi, Tomohiro
	NRID 1000080182575 1000080182575 researchmap permalink read0014081 read0014081 著者名 Yamanaka, Toshio
	著者名 Sandberg, Mats
	NRID 1000080982305 1000080982305 researchmap permalink yamasaswa_haruna yamasaswa_haruna 著者名 Yamasawa, Haruna
	著者名 Shohei, Miyazawa
キーワード等	Buoyant flow
	Computational fluid dynamics (CFD)
	Natural ventilation
	Reynolds number independence
	Similarity
内容	Jiang Z., Kobayashi T., Yamanaka T., et al. The similitude of indoor airflow in natural ventilation for a reduced-scale model: Investigation of nonisothermal flow fields by RANS simulation. Building and Environment 262, 111842 (2024); https://doi.org/10.1016/j.buildenv.2024.111842.
抄録	Reduced-scale experiments and simulations are important approaches in natural ventilation research, and the similarity requirement is fundamental for generalising the flow characteristics obtained from reduced-to full-scale conditions. However, the similarity requirement of a nonisothermal natural ventilation flow in a reduced-scale model poses additional challenges because of the reduced approaching flow, which can potentially result in Reynolds dependence issues. This study investigated the Reynolds number (Re) independence of indoor airflow in natural ventilation under isothermal and nonisothermal conditions using computational fluid dynamics (CFD) with Reynolds-averaged Navier–Stokes. A wind tunnel experiment was first conducted to validate the accuracy of the CFD using a reduced-scale model. Indoor airflow fields characterised by the same Archimedes number (Ar) but with varying approaching wind velocities and temperatures were compared between the full-scale and 1/10 reduced-scale simulations. The dimensionless ventilation rate showed the least dependence on the Re number, while the temperature field was very sensitive to the Re number, especially in the near-wall region. However, the temperature field on the ventilation pathway is much less dependent on the Re number, the deviation of which is less than 10 % compared to the full-scale simulation. The temperature distribution in the reduced-scale simulation exhibits a thermal stratification pattern similar to that in the full-scale simulation.
出版者	Elsevier Ltd
収録物名	Building and Environment
巻(号)	262
ページ	111842
刊行年月	2024-08-15
言語	英語
ハンドルURL	https://hdl.handle.net/11094/98169
PISSN	03601323
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.1016/j.buildenv.2024.111842
アクセス権	open access
権利情報	This article is licensed under a Creative Commons Attribution 4.0 International License.
出版タイプ	Version of Record
カテゴリ	学術雑誌論文 Journal Article

資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
DCTERMS.bibliographicCitation	Building and Environment. 2024, 262, p. 111842
DC.title	The similitude of indoor airflow in natural ventilation for a reduced-scale model: Investigation of nonisothermal flow fields by RANS simulation
DC.creator	Jiang, Zitao
	Kobayashi, Tomohiro
	Yamanaka, Toshio
	Sandberg, Mats
	Yamasawa, Haruna
	Shohei, Miyazawa
DC.publisher	Elsevier Ltd
DC.language' scheme='DCTERMS.RFC1766	英語
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2024-08-15
DC.identifier	https://doi.org/10.1016/j.buildenv.2024.111842
DC.subject	Buoyant flow
	Computational fluid dynamics (CFD)
	Natural ventilation
	Reynolds number independence
	Similarity
DC.description	Jiang Z., Kobayashi T., Yamanaka T., et al. The similitude of indoor airflow in natural ventilation for a reduced-scale model: Investigation of nonisothermal flow fields by RANS simulation. Building and Environment 262, 111842 (2024); https://doi.org/10.1016/j.buildenv.2024.111842.
DCTERMS.abstract	Reduced-scale experiments and simulations are important approaches in natural ventilation research, and the similarity requirement is fundamental for generalising the flow characteristics obtained from reduced-to full-scale conditions. However, the similarity requirement of a nonisothermal natural ventilation flow in a reduced-scale model poses additional challenges because of the reduced approaching flow, which can potentially result in Reynolds dependence issues. This study investigated the Reynolds number (Re) independence of indoor airflow in natural ventilation under isothermal and nonisothermal conditions using computational fluid dynamics (CFD) with Reynolds-averaged Navier–Stokes. A wind tunnel experiment was first conducted to validate the accuracy of the CFD using a reduced-scale model. Indoor airflow fields characterised by the same Archimedes number (Ar) but with varying approaching wind velocities and temperatures were compared between the full-scale and 1/10 reduced-scale simulations. The dimensionless ventilation rate showed the least dependence on the Re number, while the temperature field was very sensitive to the Re number, especially in the near-wall region. However, the temperature field on the ventilation pathway is much less dependent on the Re number, the deviation of which is less than 10 % compared to the full-scale simulation. The temperature distribution in the reduced-scale simulation exhibits a thermal stratification pattern similar to that in the full-scale simulation.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	98169
citation_title	The similitude of indoor airflow in natural ventilation for a reduced-scale model: Investigation of nonisothermal flow fields by RANS simulation
citation_author	Jiang, Zitao
	Kobayashi, Tomohiro
	Yamanaka, Toshio
	Sandberg, Mats
	Yamasawa, Haruna
	Shohei, Miyazawa
citation_publisher	Elsevier Ltd
citation_language	英語
citation_date	2024-08-15
citation_journal_title	Building and Environment
citation_volume	262
citation_firstpage	111842
citation_doi	https://doi.org/10.1016/j.buildenv.2024.111842
citation_public_url	https://hdl.handle.net/11094/98169

The similitude of indoor airflow in natural ventilation for a reduced-scale model: Investigation of nonisothermal flow fields by RANS simulation

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