Sakai, K.; Murata, Y.; Kubo, R.; Kajiya, R.; Ishihara, O.
Bibliographic info:
The 6th International Conference on Indoor Air Quality, Ventilation & Energy Conservation in Buildings IAQVEC 2007, Oct. 28 - 31 2007, Sendai, Japan

It is necessary to unsteadily accurately estimate handling and time-related spatial distribution of theindoor environment element in respect of externality meteorological phenomenon and time-varyingmovement of the heating and cooling load in order to carry out the thermal environment design in detail.With the speedup of the recent computer, the unsteady CFD calculation was practically carried out andresults fed back to the environmental design.However, time subtraction interval and convergence decision are appropriately set at the case of theunsteady analysis, and it is necessary to examine the calculation accuracy. Then, in this study,measurement and CFD analysis of unsteady thermal environment were carried out for the gymnasiumthat adopted displacement air-conditioning system, and following characteristic of CFD was examined.As a result of comparing the measurement with the analysis, it was confirmed that both LES and k-?corresponded to actual phenomenon approximately on the temperature distribution. In k-? withSIMPLEC analysis, it was cleared that calculation accuracy that is equivalent to MAC, if timesubtraction interval is made to be less than 1sec.