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A Method for Pedestrian Wind Environment Assessment of High-altitude Open-air Platform Based on CFD Numerical Simulation

An open-air platform and numerical simulation technology, applied in geometric CAD, electrical digital data processing, special data processing applications, etc., can solve the problems of insufficient precision, simplified models, high cost, etc., and achieve the effect of avoiding discomfort

Active Publication Date: 2019-09-13
黑龙江省工研院资产经营管理有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems of high cost of existing wind tunnel tests, simplified models, too small scale ratio, and insufficient accuracy of existing wind environment assessment methods, the present invention further proposes a method for assessing pedestrian wind environment on high-altitude open-air platforms based on CFD numerical simulation

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  • A Method for Pedestrian Wind Environment Assessment of High-altitude Open-air Platform Based on CFD Numerical Simulation
  • A Method for Pedestrian Wind Environment Assessment of High-altitude Open-air Platform Based on CFD Numerical Simulation
  • A Method for Pedestrian Wind Environment Assessment of High-altitude Open-air Platform Based on CFD Numerical Simulation

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specific Embodiment approach 1

[0023] Specific implementation mode one: combine Figure 1 to Figure 5 To illustrate this embodiment, the specific steps of a CFD numerical simulation-based pedestrian wind environment assessment method for high-altitude open-air platforms described in this embodiment are as follows:

[0024] Step 1. Use the large-scale commercial software ICEM CFD to establish a full-scale numerical calculation model to evaluate a multi-tower conjoined high-rise building, and perform the minimum calculation according to the German standard "Guidelines for Best Practices in CFD Numerical Simulation of Urban Wind Environment" COST Action 732 The computational domain of CFD numerical simulation is set according to the requirements of the domain; the hybrid grid is used to discretize the computational domain, and the boundary layer grid is used to refine the grid near the platform;

[0025] Step 2. Formulate the calculation conditions of CFD numerical simulation, and study the improvement effect ...

specific Embodiment approach 2

[0039] Specific implementation mode two: combination Figure 1 to Figure 5 This embodiment is described. The calculation domain used in Step 1 of a CFD numerical simulation-based pedestrian wind environment assessment method for high-altitude open-air platforms in this embodiment is based on the German standard "CFD Numerical Simulation Best Practice Guide for Urban Wind Environment" COST Action 732 sets the requirements for the minimum computational domain, that is, the outline size of the computational domain meets the requirements of width × height × length = 5H × 6H × 20H, where the calculation model requires 5H in the front and 15H in the rear. The blocking rate of the computational domain is 0.48%.

[0040] The computational domain is discretized with a hybrid grid, that is, a small computational domain is set around the computational model, and a smaller-sized tetrahedral unstructured grid is used inside the small computational domain, while larger-sized blocks are used...

specific Embodiment approach 3

[0041] Specific implementation mode three: combination Figure 1 to Figure 5 Describe this embodiment, the hourly average wind speed U of the height of pedestrians on the high-altitude open-air platform in step 3 and step 4 of a CFD numerical simulation-based pedestrian wind environment assessment method of the high-altitude open-air platform described in this embodiment i and wind speed ratio U i / U r Hourly average wind speed ratio r M and the hourly average wind speed threshold U thr,M Both are parameters describing the aerodynamic information of the pedestrian wind environment on the high-altitude open-air platform, and the pedestrian height refers to the height of 2m above the high-altitude open-air platform.

[0042] In the third step, the Class B geomorphic shear flow (including the average wind speed profile and turbulence profile) in my country's "Code for Loading of Building Structures" (GB5009-2012) is used as the inflow boundary condition for CFD numerical simul...

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Abstract

The invention relates to a method for assessing a pedestrian wind environment of a high-altitude open platform, in particular to a CFD numerical simulation-based method for assessing the pedestrian wind environment of the high-altitude open platform, and aims to solve the problems of high cost, model simplification and excessively small scale ratio of an existing wind tunnel experiment and low precision of an existing wind environment assessment method. The method comprises the specific steps of setting a computational field of CFD numerical simulation for a requirement of a minimum computational field; discretizing the computational field by adopting a hybrid grid, and encrypting a grid near the platform by adopting a boundary layer grid; establishing a computational condition of the CFD numerical simulation; performing the CFD numerical simulation; and converting a hourly average wind speed threshold Uthr in a wind environment assessment standard (an NEN 8100 assessment standard is adopted in the method) into an hourly average wind speed threshold Uthr, M at an actual high-rise building height of 10m based on a wind speed ratio rM. The method belongs to the field of building wind environments.

Description

technical field [0001] The invention relates to a method for assessing the wind environment of pedestrians on a high-altitude open-air platform, in particular to a method for evaluating the wind environment of pedestrians on a high-altitude open-air platform based on CFD numerical simulation, and belongs to the field of building wind environment. Background technique [0002] With the development of urbanization in our country, a large number of (super) high-rise buildings have emerged, and the architectural forms are becoming more and more diverse. In recent years, a new type of architectural form - multi-tower conjoined high-rise buildings has become more and more popular among architects, and it better meets the increasingly changing requirements of building functions. For multi-tower conjoined high-rise buildings, the towers are usually connected by high-altitude open-air platforms. Due to the small distance between the towers, there is a "narrow tube effect" when the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/13
Inventor 郑朝荣
Owner 黑龙江省工研院资产经营管理有限公司
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