How to model airflow discharged from diffuser is believed to be one of the key issues in ComputationalFluid Dynamics (CFD) applications to indoor air problem. Due to the complicated geometric feature andthe vortex-type airflow induced by swirl diffuser, simulating such a kind of diffuser is claimed to be achallenge. A simplified method of defining the boundary conditions at round swirl inlets is developedand introduced in this paper.
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