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

Number of Access:489（2025-08-16 03:18 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/98169

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Title
The similitude of indoor airflow in natural ventilation for a reduced-scale model: Investigation of nonisothermal flow fields by RANS simulation
Creator
CreatorName
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
CreatorName
Kobayashi, Tomohiro
NRID
1000080182575 1000080182575
researchmap permalink
read0014081 read0014081
CreatorName
Yamanaka, Toshio
CreatorName
Sandberg, Mats
NRID
1000080982305 1000080982305
researchmap permalink
yamasaswa_haruna yamasaswa_haruna
CreatorName
Yamasawa, Haruna
CreatorName
Shohei, Miyazawa
Subject
Buoyant flow
Computational fluid dynamics (CFD)
Natural ventilation
Reynolds number independence
Similarity
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.
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.
Publisher
Elsevier Ltd
Source Title
Building and Environment
Volume (Issue)
262
Page
111842
Date of Issued
2024-08-15
Language
English
Handle URL
https://hdl.handle.net/11094/98169
PISSN
03601323
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1016/j.buildenv.2024.111842
Access Rights
open access
CopyRight
This article is licensed under a Creative Commons Attribution 4.0 International License.
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Category
学術雑誌論文 Journal Article