Influence of inlet turbulent condition on the formation mechanism of local scalar concentrations

Haruna Yamasawa, Teruaki Hirayama, Kazuki Kuga, Ryota Muta, Tomohiro Kobayashi, Kazuhide Ito

研究成果: ジャーナルへの寄稿学術誌査読


In the existing ventilation design, the ventilation rate is defined by the time-averaged flow rate, and the fluctuating (turbulence) component is not typically considered. However, inlet turbulent conditions are also assumed to have some influence on the formation of contaminant distributions. Therefore, the influence of turbulent kinetic energy at the inlet boundary on scalar transportation in an indoor environment needs to be elucidated when discussing the ventilation rate setpoint via the supply inlet in terms of local contaminant concentration control. This study discusses the impact of turbulent kinetic energy in the ventilation design on scalar transfer and its distribution within an enclosed space. To understand the influence of various inlet turbulent boundary conditions on scalar transfer, a computational fluid dynamics analysis was conducted using two different room models: a simple room and a room with a ventilation system that creates a large velocity gradient. The results indicate that scalar transfer within the room is not solely dominated by the averaged velocity input at the inlet boundary but is also strongly affected by the turbulence conditions at the inlet boundary. The numerical results indicate the possibility of a new ventilation design strategy that simultaneously considers the transfer of turbulent components and contaminants.

ジャーナルJapan Architectural Review
出版ステータス出版済み - 10月 2022

!!!All Science Journal Classification (ASJC) codes

  • 建築
  • 環境工学
  • モデリングとシミュレーション


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