At present, Computational-Fluid-Dynamics (CFD) with the ‘standard’ k- ɛ model is a popular method for numerical simulation of room airflow. The k- ɛ model needs a lot of computing time and large a computer. This paper proposes a new zero-equation model to simulate three dimensional distributions of air velocity, temperature, and contaminant concentrations in rooms. The method assumes turbulent viscosity to be a function of length-scale and local mean velocity. The new model has been used to predict natural convection, forced convection, mixed convection, and displacement ventilation in a room. The results agree reasonably with experimental data and the results obtained by the standard k- ɛ model. The zero-equation model uses much less computer memory and the computing speed is at least 10 times faster, compared with the k- ɛ model. The grid size can often be reduced so that the computing time needed for a three-dimensional case can be a few minutes on a PC.
Energy and Buildings – Elsevier
Published: Oct 1, 1998
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