Numerical Analysis Of Flow Around Highrise Buildings Integrated Vertical Axis Wind Turbines

As a new type of architectural form for energy saving and emission reduction, the integration of wind turbine and building has made a positive significance in today’s society which vigorously promotes the development of green building and low carbon economy. Firstly, this paper uses the turbulence model of large eddy simulation(LES) to simulate the 3D static turbulent numerical calculation in the flow field, which is under the integration of vertical axis wind turbines and the high-rise buildings. And obtains the building’s across-wind power spectrum and the characteristic of the surface wind pressure distribution under these situations, including whether there is a turbine or not and in different wind speed. Secondly, using the standard k ?? turbulence model and combing the “dynamic grid technology” to gain the torque coefficient of the wind turbine and its flow field characteristics. All the calculation results show that:(1). Under different wind speed, whether the building model(respectively is square model and concave corner model) has a wind turbine or not, the across-wind power spectrum exists an obvious spectrum peak. What’s more, the curve appears to be unimodal.Through the comparison with the frequency of the vortex shedding of the concave angel building when it has a wind turbine or not. The results show that under the same wind speed, with the increase of incoming flow and the wind turbine blades angel, the frequency of the vortex shedding will be accelerated. However, the vortex shedding without a wind turbine is greater than that the building has one. It is obviously that the existence of the wind turbine has improved the structure of the flow field and weaken the influence of wind load on the building.(2). Under different wind speed, the wind pressure of the windward side of the building is positive whether it has a wind turbine or not. While the leeward and crosswind side’s wind pressures are negative. The coefficient of wind pressure reaches to the maximum when it is at the middle point of the windward side. And the coefficient of wind pressure will be decrease gradually when it closes to both sides. The coefficient of wind pressures at the concave corner are all negative if the concave angel building were without a wind turbine. Nevertheless, as for the building with the wind turbine, the wind pressure is either positive or negative where the wind machine has been installed. Therefore, when designing the structure and doing construction, it is necessary to pay more attention to the change of wind pressure caused by the wind turbine.Because this may lead to damage the partial of the building surface.(3). When the wind speed is different, the different circumferential torque coefficients of the wind turbine will change according to the periodic sine and cosine curve. Furthermore, the torque coefficient at the corner of the windward side is generally higher than that at the corner of the leeside side. This indicates that the wind turbine at the windward side can make a highly utilization of the wind energy.This paper is aimed at stimulating the static and dynamic numerical in the flow field under different working conditions with a consideration that the building has a wind turbine or hasn’t one. Then the author gains a detailed flow field structure from the stimulation. Meanwhile, the author has analyzed the construction of cross power spectrum of wind force, wind pressure coefficient and torque coefficient when the building in this two situations(with a wind turbine and without a wind turbine). Only in this way, it can help the author make a better judgment about the wind load’s impact on the buildings. Moreover, it provides experiences and references for a further exploration and application of the wind power construction.