Numerical simulation of smoke natural filling in super-high atriums

Based on the results of full-scale hot smoke experiment by Tanaka in common atrium, verifies the boundary conditions of numerical simulation of atrium by FDS software. Applies three super-high atrium models based on the verified atrium numerical model, and studies the filling of the plume flow in the atriums with same cross-section area and different heights. The results show that the numerical simulation method is feasible to predict the height of the smoke layer in the atrium.There is a certain error between the numerical simulation results and the experimental results, but the downward trend of the smoke layer is consistent. With the same cross-section area of the super-high atriums and the different height, the shape of the free rising process of the smoke plume before the touching top is consistent. The smoke filling mode of the atrium is related to the height of the atrium. The filling of lower atrium smoke is mainly in descending mode (firstly touching the top and then settling), and the higher atrium smoke is mainly in spread up filling mode (firstly touching the wall and then filling, finally touching the top).