数値流体解析における空調用天井吹出口のモデリング手法 : 等温実大実験と数値シミュレーション(その1)

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Computational Fluid Dynamics (CFD) is one of the most useful techniques to predict the air distribution in air-conditioned and ventilated rooms. The supply airflow such as free jet, wall jet and combined flow of these jets has a great influence on the air distribution in rooms. Most of supply air diffusers have complex geometry, however, the shape of diffuser is usually oversimplified in CFD with coarse grids system. The results of such simulation may give incorrect prediction due to the poor modeling of diffusers. Even if the complex geometry of air diffuser can be described in detail, huge computer capacity and very long calculation time were required. In this paper, several modeling methods to simplify the boundary condition around air diffusers, such as BOX Method (P.V. Nielsen; 1976,1992) and P.V. Method (Prescribed Velocity Method, P.V. Nielsen et al.; 1980), are compared. These modelings require the distribution of air velocity, turbulence properties, temperature and concentrations around the diffuser beforehand. These data as the boundary condition for CFD with coarse grids can be obtained from the experimental measurement or the unstructured CFD simulation with fine meshes. In this paper, the full scale experiment was carried out at isothermal condition, and the airflow data around complex air diffuser installed at ceiling was obtained. With the basis of the flow data around the diffuser by the measurement, BOX Method and P.V. Method were applied to the air diffuser. The results of coarse grids CFD showed the good agreement not only around diffusers but in other part of rooms with the measurement.
社団法人日本建築学会の論文
2002-07-30

数値流体解析における空調用天井吹出口のモデリング手法 : 等温実大実験と数値シミュレーション(その1)

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