CFD-based wind environment assessment method for buildings considering the cross-flow effect of buildings

Abstract

The embodiment of the invention provides a building wind environment assessment method based on CFD. The method comprises: using porous media unit to simulate the target building unit, and then simulating the whole building group, it is not necessary to study the windowed model of the target building unit, but using the porous media unit as a window to study the target building unit. It has a positive significance for building 'breathable' building units and improving the simulation accuracy of urban building units. The method proposed in the embodiment of the invention greatly reduces the calculation amount of the three-dimensional simulation of the shield in the real scene room, It is hopeful to advance the general building and block scale (1 km) of high-precision CFD numerical simulation to the urban scale (10 km), which provides scientific evidence for urban planners and government decision-making to build a resource-sustainable city.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of fluid mechanics building wind environment, and more specifically, relate to a CFD-based method for assessing building wind environment considering the effect of building through-flow. Background technique [0002] With the development of society and the acceleration of the urbanization process, the construction process of urban medium and high-rise buildings not only needs to consider the air circulation of the building itself, but also the changes in the wind environment caused by the building. The high-rise buildings become the path for the wind to pass through, and the narrow wind passage forms a "laneway effect", which makes the wind speed in this area significantly faster, causing unsafe and uncomfortable problems for pedestrians in the process of walking and activities. [0003] At present, the research on the dynamic diffusion mechanism of buildings is usually carried out in t...

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Problems solved by technology

[0004] However, although the wind tunnel simulation test can accurately deduce the building wind environment, the environment required for the experiment is large and the instruments are expensive, so it is not suitable for testing the simulation needs under different environmental parameters.

Although CFD numerical simulation has advantages that wind tunnel simulation tests do not have, it is limited by the imperfection of the turbulence theory itself and the adaptability of the turbulence model and the adaptability of the calculation method, resulting in the reliability of the CFD numerical simulation method. It needs to be verified by later experiments, which increases the complexity

Moreover, it is necessary to determine a suitable turbulence model for each different building, which greatly increases the amount of calculation

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