Airflow simulation in air-conditioned and ventilated rooms with zero-equation model

Evaluates the zero-equation model provided by Chen based on CFD simulation of three typical airflows(forced convection, mixed convection and natural convection)in air-conditioned and ventilated rooms. The simulation results by applying zero-equation model are compared with those by adopting Prandtl mixing length theory and K-ε two equation model. The results show that Prandtl mixing length theory predicts airflows better than zero-equation model provided by Chen, and that Prandtl mixing length theory is more reasonable than zero-equation model provided by Chen but Chen’s model seems easier to converge from the analyses of their construction. Compared with K-ε two equation model, zero-equation model with low accuracy is still a low-level model, but it can save much computing cost.