建筑屋盖表面及其周围积雪分布研究

Accurately predicting snow spatial distribution forms on roof surface of a building and its surrounding is an important means to prevent snow disasters. Based on Euler-Euler method, assuming that both air phase and snow one are a continuous phase, the mixture multi-phase flow model and the k-kl-ω turbulence one were used to simulate wind snow drift around a building model by means of the computational fluid dynamics (CFD) software FLUENT 17.0. Firstly, taking a cube as the study object and using four groups of grid, the grid independence was verified. Then the wind field around the cube was simulated and the average wind pressure coefficients along the windward central line were compared, the results showed that the computational results of the k-kl-ω model agree well with those of the field measurement. Finally, the snow distributions around the cube and on the surfaces of a high roof and a low one were simulated, the results were compared with those of the field measurement and wind tunnel tests, it was shown that their erosion and deposition trends are consistent.