ANÁLISE DE DIFERENTES CONFIGURAÇÕES DE POROSIDADE EM CFD

Abstract

The CFD - Computer Fluid Dynamics softwares are useful tools in the simulation of natural ventilation in buildings, since they allow fixing several variables simultaneously, allowing the analysis of different parameters in the natural ventilation performance. However, the knowledge demanded on simulations and time required for it can be an obstacle for the researcher. Openings configuration and consequently modeling porosity is one of the aspects that impact most the time needed for modeling and subsequent simulation. The present work aimed to evaluate the efficiency of porosity configuration use in the computer program PHOENICS version 1.0 2018, for simulating the natural ventilation performance in buildings. In the simulations, an isolated single-storey house model was adopted, typical social housing of Brazil. 16 different models were built, varying the presence of openings, internal partitions and the software porosity configuration, equivalent to the 4.66% porosity of the model with openings. A comparative analysis of the performance of natural ventilation was performed in the simulated models. The model with the external surfaces porosity configuration showed pressure differences of only 0.05Pa, being the completely opaque the most efficient model for studying values of the external pressure coefficient. The model with external openings and without internal partitions proved to be very effective in reducing the simulation time and presenting consistent results.