Gaoyuan qixiang (Apr 2024)

Application of Large Eddy Simulation on Qinghai-Xizang Plateau Wind for Airdrop

  • Yansong BAO,
  • Lingxiao JI,
  • Huan LI,
  • Qifeng LU,
  • Fu WANG

DOI
https://doi.org/10.7522/j.issn.1000-0534.2023.00051
Journal volume & issue
Vol. 43, no. 2
pp. 293 – 302

Abstract

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The Qinghai-Xizang Plateau has complex terrain and climate， which is a great challenge to the airdrop parachute landing and aviation safety.This research focuses on Qinghai-Xizang Plateau wind field simulation in boundary layer based on numerical calculation method.Firstly， the study built a WRF-LES system and scaled down to 40 m horizontal resolution based on the large eddy simulation （LES） scheme of WRF （Weather Research and Forecasting） model， and undertook the application study of large eddy simulation on the Qinghai-Xizang Plateau.Based on a strong wind case over the Qinghai-Xizang Plateau， the impacts of LES scheme and terrain elevation data on wind field simulation were evaluated through sensitivity tests.Then， the parameters in the standard sub-grid turbulent stress models of LES scheme were analyzed， and the optimal schemes for wind field simulation on the Qinghai-Xizang Plateau was obtained.Finally， a batch test was conducted to verify the applicability of the optimal schemes to the Qinghai-Xizang Plateau wind field simulation.The test results show that the WRF-LES system with a resolution of 40 m can simulate more precise and accurate wind field information， and the MAE （Mean Absolute Error） of simulated wind speed is reduced by 1.4 m·s-1 and the RMSE （Root Mean Square Error） is reduced by 1.81 m·s-1 compared with the ACM2 scheme； The high-precision ASTER terrain data can also improve the effect of wind field simulation， and the error is approximately deduced by 0.2 m·s-1； The LES scheme that use 1.5-order turbulent flow energy scheme and set parameter coefficient 0.1 has the best simulation result， and the MAE is 1.56 m·s-1 and RMSE is 2.06 m·s-1； The batch test verifies that the large eddy simulation scheme is fit for the wind simulation on the Qinghai-Xizang Plateau， and the wind field simulation results in the 40 m resolution is significantly better than in the mesoscale resolution.The result shows that WRF-LES system can provide accurate wind field information for the parachute landing on the plateau.

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