LARGE EDDY SIMULATION OF UNSTEADY WIND FIELD AROUND BUILDING USING TURBULENT INFLOW

A 3D unsteady wind field around Texas a Tech University building was simulated using large eddy simulations considering turbulent incoming flows. The influence of mean-velocity profiles on pressure distribution of the building was firstly analyzed. Then the building pressures were simulated using three kind of incoming turbulent inflows, which are generated by a Vortex method, Spectral Synthesizer and Precursor Simulation, respectively. Numerical results were compared with data from the field test and wind tunnel test. Comparisons show that the profile of mean-velocity has a slight influence on the mean pressure but has an obvious influence on the fluctuating pressure. Therefore, topography of a building location needs to be well-defined, which means the expression of a mean-velocity profile needs to be modified based on the data of local wind in engineering. Precursor Simulation was proved to be the best one for wind engineering during three present inflow generation methods, besides, the pre-simulated turbulent inflow data could be repeatedly used in the simulation of a wind field around different buildings located in similar topography. This makes up for the inherent time- and memory-consuming defect of precursor simulation.