Wind and Structures

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Fast simulation of large-scale non-stationary wind velocities based on adaptive interpolation reconstruction scheme

  • Han, Hui (Department of Civil Engineering, School of Mechanics and Engineering Science, Shanghai University) ;
  • Li, Chunxiang (Department of Civil Engineering, School of Mechanics and Engineering Science, Shanghai University) ;
  • Li, Jinhua (Department of Civil Engineering, East China Jiaotong University)
  • Received : 2019.11.28
  • Accepted : 2021.06.15
  • Published : 2021.07.25
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Abstract

Spectral representation method (SRM) is the most classical one for the simulation of wind velocity. It is inefficiency when applied to large-scale non-stationary wind velocities with large simulation points. There are two reasons: numerous Cholesky decomposition and summation of Trigonometric terms. In order to improve the efficiency while ensuring accuracy, two aspects of work have been in this paper. (1) An adaptive interpolation-enhanced scheme is devised, which uses "average resolution" as the quantization index. This scheme can automatically realize the non-uniform distribution of interpolation points in two dimensions of time and frequency simultaneously, and improve the accuracy of interpolation. (2) The non-stationary wind velocities were reconstructed in time, frequency and space domain. Firstly, interpolation in time and frequency domain is directly applied to the H matrix, then proper orthogonal decomposition (POD) technology is introduced to decouple the wind velocities at spatial interpolation points, so as to obtain the time-dependent principal coordinates and space-dependent intrinsic mode function (IMF). Finally, IMF is reconstructed in the space domain to obtain the complete wind velocities. The above methodology is carried out to a super high-rise building containing 100 wind velocities simulation points and, results show that the proposed approach saves about 88% of the computational time compared with the classical SRM; saves about 47% of the computational time compared with the time-frequency interpolation based method. This paper achieves the rapid construction of large-scale non-stationary wind velocities.

Keywords

Acknowledgement

This study is supported by the National Natural Science Foundation of China (Grant No. 51778354).

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