Simulation of air flow in the IEA Annex 20 test room

Validation of a simplified model for the nozzle diffuser in isothermal test cases

S. Luo, Jorma Heikkinen, Bernard Roux (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

23 Citations (Scopus)

Abstract

The modeling of air supply devices has been identified from the International Energy Agency (IEA) Annex 20 project as one of the most important problems in applying computational fluid dynamics (CFD) to predict air flow pattern and air distribution in buildings, and the complicated HESCO nozzle diffuser used in the IEA Annex 20 test room has been proved to be particularly difficult to model. In a previous study, a simplified model for this diffuser was developed and validated against experimental data. It has been shown that this model can yield good prediction for the wall jet flow issued from the diffuser, but whether this model is capable of correctly predicting the global flow pattern in the whole test room was not known. In this paper, the benchmark data of the IEA Annex 20 Test Cases B2 and B3 were used to evaluate the performance of the model for the prediction of the global air flow pattern in the test room. It was demonstrated that this model can predict the air flow pattern in the whole test room for both the Test Cases B2 and B3 with reasonable accuracy. The significance of a velocity correction when comparing the numerical prediction with experimental data obtained using omni-directional anemometers was also discussed.
Original languageEnglish
Pages (from-to)1403 - 1415
Number of pages13
JournalBuilding and Environment
Volume39
Issue number12
DOIs
Publication statusPublished - 2004
MoE publication typeA1 Journal article-refereed

Fingerprint

Diffusers (fluid)
airflow
Nozzles
air
energy
flow pattern
Flow patterns
simulation
Air
prediction
jet flow
anemometer
Anemometers
computational fluid dynamics
test
building
Computational fluid dynamics
supply
modeling
performance

Keywords

  • CFD
  • air supply diffuser
  • ventilation
  • wall jet
  • flow asymmetry
  • velocity correction
  • local mesh refinement

Cite this

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title = "Simulation of air flow in the IEA Annex 20 test room: Validation of a simplified model for the nozzle diffuser in isothermal test cases",
abstract = "The modeling of air supply devices has been identified from the International Energy Agency (IEA) Annex 20 project as one of the most important problems in applying computational fluid dynamics (CFD) to predict air flow pattern and air distribution in buildings, and the complicated HESCO nozzle diffuser used in the IEA Annex 20 test room has been proved to be particularly difficult to model. In a previous study, a simplified model for this diffuser was developed and validated against experimental data. It has been shown that this model can yield good prediction for the wall jet flow issued from the diffuser, but whether this model is capable of correctly predicting the global flow pattern in the whole test room was not known. In this paper, the benchmark data of the IEA Annex 20 Test Cases B2 and B3 were used to evaluate the performance of the model for the prediction of the global air flow pattern in the test room. It was demonstrated that this model can predict the air flow pattern in the whole test room for both the Test Cases B2 and B3 with reasonable accuracy. The significance of a velocity correction when comparing the numerical prediction with experimental data obtained using omni-directional anemometers was also discussed.",
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Simulation of air flow in the IEA Annex 20 test room : Validation of a simplified model for the nozzle diffuser in isothermal test cases. / Luo, S.; Heikkinen, Jorma; Roux, Bernard (Corresponding Author).

In: Building and Environment, Vol. 39, No. 12, 2004, p. 1403 - 1415.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Simulation of air flow in the IEA Annex 20 test room

T2 - Validation of a simplified model for the nozzle diffuser in isothermal test cases

AU - Luo, S.

AU - Heikkinen, Jorma

AU - Roux, Bernard

PY - 2004

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N2 - The modeling of air supply devices has been identified from the International Energy Agency (IEA) Annex 20 project as one of the most important problems in applying computational fluid dynamics (CFD) to predict air flow pattern and air distribution in buildings, and the complicated HESCO nozzle diffuser used in the IEA Annex 20 test room has been proved to be particularly difficult to model. In a previous study, a simplified model for this diffuser was developed and validated against experimental data. It has been shown that this model can yield good prediction for the wall jet flow issued from the diffuser, but whether this model is capable of correctly predicting the global flow pattern in the whole test room was not known. In this paper, the benchmark data of the IEA Annex 20 Test Cases B2 and B3 were used to evaluate the performance of the model for the prediction of the global air flow pattern in the test room. It was demonstrated that this model can predict the air flow pattern in the whole test room for both the Test Cases B2 and B3 with reasonable accuracy. The significance of a velocity correction when comparing the numerical prediction with experimental data obtained using omni-directional anemometers was also discussed.

AB - The modeling of air supply devices has been identified from the International Energy Agency (IEA) Annex 20 project as one of the most important problems in applying computational fluid dynamics (CFD) to predict air flow pattern and air distribution in buildings, and the complicated HESCO nozzle diffuser used in the IEA Annex 20 test room has been proved to be particularly difficult to model. In a previous study, a simplified model for this diffuser was developed and validated against experimental data. It has been shown that this model can yield good prediction for the wall jet flow issued from the diffuser, but whether this model is capable of correctly predicting the global flow pattern in the whole test room was not known. In this paper, the benchmark data of the IEA Annex 20 Test Cases B2 and B3 were used to evaluate the performance of the model for the prediction of the global air flow pattern in the test room. It was demonstrated that this model can predict the air flow pattern in the whole test room for both the Test Cases B2 and B3 with reasonable accuracy. The significance of a velocity correction when comparing the numerical prediction with experimental data obtained using omni-directional anemometers was also discussed.

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KW - ventilation

KW - wall jet

KW - flow asymmetry

KW - velocity correction

KW - local mesh refinement

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