Evaluation of various thermal and fluid simulation parameters of performance of NVDSF with Fluent software

The mechanism of operation of the double skin facade with natural ventilation (NVDSF) is based on the thermal behavior and air flow in the middle cavity. Computational fluid dynamics can improve the performance of these views. The purpose of this paper is to investigate various options related to turbulence and radiation model of Fluent software and geometric features including two-dimensional or three-dimensional simulated geometric model, scaled threedimensional model and mesh dimensions, to simulate the thermal performance of the façade with Fluent software with the aim of improving the accuracy of the results and achieving the shortest computer computation time. The results show that the RNG k-ε turbulence model, the DO radiation model and the 3D geometric model will have the most accurate results. In mesh with dimensions of 8 mm and a scale of 33% of the real three-dimensional sample, the simulation results were independent of the mesh dimensions and scaled geometry. Simulations geometry with a scale of 33% of real 3D samples compared to real 3D geometry led to similar results in terms of accuracy. Finally, the reduction of computer computation time simulation of NVDSF with scaled geometry of 33% of the real sample to about one third was achieved by maintaining the accuracy of the results.