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CN-121977789-A - Real-scale wind field value reconstruction method for low-altitude rapid flow with vertical wind direction shear

CN121977789ACN 121977789 ACN121977789 ACN 121977789ACN-121977789-A

Abstract

The invention relates to the field of atmospheric wind field modeling, and provides a real-scale wind field numerical reconstruction method aiming at low-altitude rapid flow with vertical wind direction shear, which directly takes a target statistical characteristic as a driving target, uses computing resources in a most critical structural wind field interaction area in a concentrated mode, enables a wind field at a target position to quickly converge on a preset characteristic by iteratively adjusting parameters of a single control point, namely an inlet boundary, and does not need to carry out high-resolution solution on the whole atmospheric boundary layer, thereby realizing order-of-magnitude improvement of computing efficiency on the premise of ensuring the wind field reconstruction precision at the target position.

Inventors

  • ZHOU ZELIN
  • LIU MINGLIANG
  • ZHAO GUANGPO
  • LIAO LIAN
  • YAO PING
  • LI JI
  • ZHU LEI
  • HU WEISHAN
  • LIANG JUNSONG
  • LI XIN
  • SI ZHENWEI
  • FENG CHENGDONG
  • ZHOU CHUNJUAN
  • WU YANRU
  • YAO BO
  • DONG BIAO
  • QUAN YONG
  • CHEN XIMING
  • LI DONG
  • QU YAO
  • CHEN HONGBING

Assignees

  • 中国十九冶集团有限公司

Dates

Publication Date
20260505
Application Date
20260407

Claims (10)

  1. 1. The method for reconstructing the real-scale wind field value aiming at low-altitude rapid flow with vertical wind direction shear is characterized by comprising the following steps: step 1, defining target statistical characteristic parameters of a low-altitude rapid flow accompanying wind direction vertical shear wind field required to be simulated at a target position and initial entry parameters of numerical simulation based on statistical analysis results of field actual measurement data; Step 2, synthesizing a fluctuating wind speed field meeting preset turbulence characteristics in real time by using an inlet fluctuating wind speed generation technology based on initial inlet parameters; step 3, performing wind field numerical simulation calculation on the fluctuating wind speed field to obtain wind speed data in the whole calculation domain; step 4, based on wind speed data, extracting statistical characteristic parameters of the target position obtained by simulation, and comparing the statistical characteristic parameters with the target statistical characteristic parameters; And 5, carrying out iterative adjustment on the initial inlet parameters in the step 2 according to the comparison result until the statistical characteristic parameters at the target positions obtained by simulation and the corresponding target statistical characteristic parameters meet the preset matching requirements.
  2. 2. The method for reconstructing a real-scale wind field value for low-altitude rapid flow with vertical wind direction shear according to claim 1, wherein the statistical characteristic parameter is at least one of average wind speed, average wind direction angle, turbulence intensity and pulsatile wind speed power spectrum density of different height layers.
  3. 3. The method for reconstructing the real-scale wind field value for low-altitude rapid-flow wind-accompanying vertical shear according to claim 1, wherein in step 2, the inlet pulsating wind speed generation technology synthesizes three-dimensional pulsating wind speed components by using a fast fourier transform method to obtain a pulsating wind speed field, and the specific steps include: The method comprises the steps of generating a random phase angle, calculating the amplitude corresponding to each frequency component based on a target fluctuating wind speed power spectrum density function, converting frequency domain information into a time domain fluctuating wind speed sequence by utilizing fast Fourier transformation, and ensuring the relativity of the fluctuating wind speeds at different points in space by applying a spatial coherence function model.
  4. 4. The method for reconstructing the real-scale wind field value for low-altitude rapid flow with vertical wind direction shear according to claim 3, wherein the target pulsating wind speed power spectrum density function adopts Kaimal spectrum or von Karman spectrum.
  5. 5. The method for reconstructing the real-scale wind field values for low-altitude rapid flow with vertical wind direction shear according to claim 3, wherein the inlet parameters comprise parameters corresponding to a target pulsating wind speed power spectrum density function, and parameters in a spatial coherence function model of amplitude and phase angle in a three-dimensional pulsating wind speed component synthesis process and pulsating wind speed.
  6. 6. A method of reconstructing a real scale wind field value for low altitude rapid flow with vertical wind direction shear according to claim 3, wherein the spatial coherence function model takes the form of exponential decay.
  7. 7. The method for reconstructing the real-scale wind field values for low-altitude rapid flow with vertical wind direction shear according to claim 1, wherein the preset turbulence characteristics comprise no divergence conditions, compliance with spatial correlation, target coherence function and fluctuating wind speed power spectrum.
  8. 8. The method of claim 1, wherein the calculation domain is set to be centered on the target position, the length along the wind direction is not smaller than a first preset distance, the width perpendicular to the wind direction is not smaller than a second preset distance, and the height direction covers the thickness of the atmospheric boundary layer.
  9. 9. The method of claim 8, wherein the boundary conditions of the calculation domain include that the entrance boundary adopts a speed entrance boundary condition and a pulsating wind velocity field synthesized in real time is applied, the exit boundary adopts a pressure exit boundary condition, the top boundary adopts a symmetrical boundary condition or a sliding boundary condition, and the ground and the surface of the structure adopt wall boundary conditions.
  10. 10. The method for reconstructing the real-scale wind field numerical value for the vertical shear of the low-altitude rapid flow accompanying wind direction according to claim 1 is characterized in that the judgment mode of whether the preset matching requirement is met is that the relative error between the wind field characteristic at the target position obtained by calculation simulation and the corresponding target statistical characteristic parameter at each height layer is calculated, the weighted comprehensive error is calculated based on the relative error, and when the weighted comprehensive error is smaller than the preset relative error threshold value, the preset matching requirement is judged to be met.

Description

Real-scale wind field value reconstruction method for low-altitude rapid flow with vertical wind direction shear Technical Field The invention relates to the field of atmospheric wind field modeling, in particular to a real-scale wind field numerical reconstruction method aiming at low-altitude rapid flow and wind direction vertical shear. Background In recent years, extreme wind climate events such as typhoons in coastal areas, inland benign strong winds, mountain canyons and the like are in multiple situations, and wind-sensitive engineering structure damage accidents caused by the extreme wind climate events occur. In the design and operation of flexible engineering structures such as large-span roofs, super high-rise buildings, large-scale wind turbines and the like, wind load often plays a critical control role. Therefore, the precise prediction of wind load and induced dynamic response on the surface of the structure is realized, and the key point of ensuring the safe, reliable, economical and reasonable structure is realized. Currently, wind load assessment of engineering structures mainly depends on two technical routes of wind tunnel tests and numerical simulation. The numerical simulation method has been developed remarkably in recent years because of relatively low cost, high efficiency, strong operability, no limitation of scale proportion of a physical model, flow field detail visualization, convenience in carrying out parameterization research and the like. The accurate depiction of the characteristics of the wind field of the atmospheric boundary layer is a prerequisite foundation for accurately predicting wind load and wind-induced effect of an engineering structure. However, both field measured data and wind tunnel test researches reveal that the phenomenon of low altitude rapid flow may occur in the atmosphere boundary layer under the comprehensive influence of factors such as coriolis force action, topographic dynamic effect, local thermal circulation, atmosphere junction stability and the like, and at this time, the average wind velocity profile is difficult to describe with traditional monotonic functions such as logarithmic law or exponential law. At the same time, the phenomenon that the wind direction deflects significantly along with the height, namely, the vertical shear of the wind direction, can also be more prominent. This complex wind field characteristic with low-altitude jerk and significant wind direction vertical shear characteristics is significantly different from the idealized wind field model specified or suggested by the current relevant building structure load specifications. In engineering practice, the potential impact of such specific wind farm environments on structural safety, use comfort, or even fatigue life is becoming increasingly interesting, requiring adequate assessment at the design stage. In the prior art, the complex wind field is mainly reconstructed by using a meteorological real ruler numerical modeling (such as a method combining a mesoscale meteorological mode with a large vortex simulation), and a large-scale calculation domain and a high-resolution grid are usually required to be set for long-time integration in order to accurately describe fine structures such as low-altitude rapid flow and wind direction vertical shear, so that extremely huge calculation resources are generally required to be consumed. The bottleneck problem of the calculation efficiency is particularly remarkable when multi-parameter and multi-working-condition systematic analysis is required. The situation is difficult to adapt to urgent engineering demands for rapidly, efficiently and accurately evaluating wind load and effect thereof in the modern wind sensitive structure design iterative process. Disclosure of Invention In order to improve the calculation efficiency, the application provides a real-scale wind field value reconstruction method aiming at low-altitude rapid flow with vertical wind direction shear. The invention solves the problems by adopting the following technical scheme: A real-scale wind field value reconstruction method aiming at low-altitude rapid flow with vertical wind direction shear comprises the following steps: step 1, defining target statistical characteristic parameters of a low-altitude rapid flow accompanying wind direction vertical shear wind field required to be simulated at a target position and initial entry parameters of numerical simulation based on statistical analysis results of field actual measurement data; Step 2, synthesizing a fluctuating wind speed field meeting preset turbulence characteristics in real time by using an inlet fluctuating wind speed generation technology based on initial inlet parameters; step 3, performing wind field numerical simulation calculation on the fluctuating wind speed field to obtain wind speed data in the whole calculation domain; step 4, based on wind speed data, extracting statistical characteristic