Indoor and outdoor airflow simulation by a zero equation turbulence model.

In order to simulate indoor air distribution and airflow around buildings quickly and accurately by CFD (Computational Fluid Dynamics) technique, a new zero-equation turbulence model and momentum method for inlet boundary condition are adopted. The new version of STACH-3, a three-dimensional CFD software is developed based on these. An example for outdoor airflow around an isolated building is given as well. For those high-density buildings with complex geometry, the TSM (Two Step Method) is proposed. Comparisons between the measured data and numerical results show that it is economic and engineering satisfied to simulate indoor and outdoor air distribution by the zero-equation turbulence model.