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Analysis of the impact of the inlet boundary conditions in FDS results for air curtain flows in the near-field region

Longxing Yu (UGent) , Fang Liu and Bart Merci (UGent)
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Abstract
CFD results are discussed for planar jet flows, resembling configurations in use for air curtain flows in the context of smoke and heat control in buildings in case of fire. The CFD package FDS (Fire Dynamics Simulator), Version 6.0.1, is used. Special focus is given to the impact of the inlet boundary condition, in combination with the mesh size, on the flow field in the near-field region. Investigation of different slot configurations, including calculations inside a straight rectangular duct ahead of the air slot, reveals a small vena contracta effect when the slot is flush with a solid boundary, leading to an acceleration of the flow in the symmetry plane in the near-field region. More important is the effect of the duct length: starting from a top hat velocity profile, a duct length of about 15 hydraulic diameters is required for the flow to become fully developed at the slot. The vena contracta effect disappears if the co-flow at the nozzle exit is aligned with the jet. The FDS results capture the self-similarity in the far-field jet region, regardless of the inlet configuration.
Keywords
CFD, FDS, Air curtain, Velocity Inlet Boundary condition, Planar Jet flows

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Citation

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MLA
Yu, Longxing, et al. “Analysis of the Impact of the Inlet Boundary Conditions in FDS Results for Air Curtain Flows in the Near-Field Region.” Ninth Mediterranean Combustion Symposium, Proceedings, 2015.
APA
Yu, L., Liu, F., & Merci, B. (2015). Analysis of the impact of the inlet boundary conditions in FDS results for air curtain flows in the near-field region. Ninth Mediterranean Combustion Symposium, Proceedings. Presented at the Ninth Mediterranean Combustion Symposium, Rhodes, Greece.
Chicago author-date
Yu, Longxing, Fang Liu, and Bart Merci. 2015. “Analysis of the Impact of the Inlet Boundary Conditions in FDS Results for Air Curtain Flows in the Near-Field Region.” In Ninth Mediterranean Combustion Symposium, Proceedings. Rhodes, Greece.
Chicago author-date (all authors)
Yu, Longxing, Fang Liu, and Bart Merci. 2015. “Analysis of the Impact of the Inlet Boundary Conditions in FDS Results for Air Curtain Flows in the Near-Field Region.” In Ninth Mediterranean Combustion Symposium, Proceedings. Rhodes, Greece.
Vancouver
1.
Yu L, Liu F, Merci B. Analysis of the impact of the inlet boundary conditions in FDS results for air curtain flows in the near-field region. In: Ninth Mediterranean Combustion Symposium, Proceedings. Rhodes, Greece; 2015.
IEEE
[1]
L. Yu, F. Liu, and B. Merci, “Analysis of the impact of the inlet boundary conditions in FDS results for air curtain flows in the near-field region,” in Ninth Mediterranean Combustion Symposium, Proceedings, Rhodes, Greece, 2015.
@inproceedings{7051383,
  abstract     = {{CFD results are discussed for planar jet flows, resembling configurations in use for air curtain flows in the context of smoke and heat control in buildings in case of fire. The CFD package FDS (Fire Dynamics Simulator), Version 6.0.1, is used. Special focus is given to the impact of the inlet boundary condition, in combination with the mesh size, on the flow field in the near-field region. Investigation of different slot configurations, including calculations inside a straight rectangular duct ahead of the air slot, reveals a small vena contracta effect when the slot is flush with a solid boundary, leading to an acceleration of the flow in the symmetry plane in the near-field region. More important is the effect of the duct length: starting from a top hat velocity profile, a duct length of about 15 hydraulic diameters is required for the flow to become fully developed at the slot. The vena contracta effect disappears if the co-flow at the nozzle exit is aligned with the jet. The FDS results capture the self-similarity in the far-field jet region, regardless of the inlet configuration.}},
  author       = {{Yu, Longxing and Liu, Fang and Merci, Bart}},
  booktitle    = {{Ninth Mediterranean Combustion Symposium, Proceedings}},
  keywords     = {{CFD,FDS,Air curtain,Velocity Inlet Boundary condition,Planar Jet flows}},
  language     = {{eng}},
  location     = {{Rhodes, Greece}},
  pages        = {{12}},
  title        = {{Analysis of the impact of the inlet boundary conditions in FDS results for air curtain flows in the near-field region}},
  year         = {{2015}},
}