Large Eddy Simulation of Flow Field over the Xiaohaituo Mountain Division for the 24th Winter Olympic Games

LIU Yujue;MIAO Shiguang;HU Fei;LIU Yubao

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Plateau Meteorology
Plateau Meteorology ›› 2018, Vol. 37 ›› Issue (5) : 1388-1401. DOI: 10.7522/j.issn.1000-0534.2018.00034

Large Eddy Simulation of Flow Field over the Xiaohaituo Mountain Division for the 24th Winter Olympic Games

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Competitions for luge, bobsleigh and alpine skiing of the 24th Winter Olympic Games in February 2022 will be held in Xiaohaituo Mountain area northwest of Beijing, 90 kilometers away from the downtown. The outdoor events are very strict on the near-surface wind fields. Therefore, it is necessary to provide wind field prediction within 100 meters resolution. At present, the widely used mesoscale models, limited by their grid resolution (>1 km), cannot meet the needs. This paper described a multi-scale weather modeling system, WRF-LES, which employs large-eddy simulation (LES) with the WRF model. The system was employed to simulate real-world conditions of a typical clear day with strong winds over Xiaohaituo mountain area. With four nested domains, the horizontal grid spacing is decreased from 1 km to 37 m. Through a group of sensitivity tests of horizontal, vertical, terrain resolution and boundary layer schemes, the applicability of WRF-LES has been evaluated and tested against in-situ observation from MOUNTOAM (Mountain Terrain Atmospheric Observations and Modeling) filed campaign. Compared to ordinary mesoscale model, 100 meters or higher resolution WRF-LES results were found to capture more microscale flows owing to its explicit resolving of large atmospheric turbulence eddies, and obtain wind field flow more resemble the real atmosphere. For accurate simulation, the topographygraphic data should be matched with the model horizontal resolution, and the vertical grid spacing needs to be carefully set. For this case, WRF-LES has the potential and value for the ultra-high-resolution simulation of the near-surface wind field over complex mountainous area. It shows high forecasting ability, and can provide technical support for fine weather service in Winter Olympic Games.

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Mesoscale model / large eddy simulatio / complex terrain / atmospheric boundary / winter olympic games

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LIU Yujue , MIAO Shiguang , HU Fei , LIU Yubao. Large Eddy Simulation of Flow Field over the Xiaohaituo Mountain Division for the 24th Winter Olympic Games. Plateau Meteorology. 2018, 37(5): 1388-1401 https://doi.org/10.7522/j.issn.1000-0534.2018.00034

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