Modelling complex inlet geometries in CFD - applied to air flow in ventilated rooms

摘要

Modern inlet devices applied in the field of ventilation of rooms are getting more complex in terms of geometry in order to fulfill the occupants' demand for thermal comfort in the room and in order to decrease the energy consumption. This expresses the need for a more precise calculation of the flow field. In order to apply computational fluid dynamics for this purpose it is essential to be able to model the inlet conditions precisely and effectively, in a way which is comprehensible to the manufacturer of inlet devices and in a way which can be coped with by the computer. In this paper a universal method is presented and tested. The method is based upon three-dimensional - and radial wall jet theory and upon diffuser specific experimental data. Simulations are held up against a more basic method and full-scale measurements. The inlet model is evaluated in terms of result, computational effort and applicability. Promising results are obtained. (au) (15 refs.).