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| Study on numerical simulation method for wind field over steep slope terrain |
| Received:August 02, 2020 Revised:September 24, 2020 |
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| DOI：10.7511/jslx20200802001 |
| KeyWord:CFD simulation steep slope terrain topographic wind field smooth curve terrain acceleration effect |
| Author | Institution |
| 郑德乾 |
河南工业大学 土木建筑学院, 郑州 |
| 李亮 |
河南工业大学 土木建筑学院, 郑州 |
| 方平治 |
中再巨灾风险管理股份有限公司, 重庆 |
| 马文勇 |
石家庄铁道大学 土木工程学院, 石家庄 |
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| Abstract: |
| Undulating terrains are the main reason for the complexity of a terrain wind field, and its characteristics are quite different from a flat and rough terrain.In order to accurately simulate the wind field around a steep hillside terrain, applicability of a numerical simulation method of flow field over a simplified steep uphill with slope angle of 45° is studied.The influence of grid resolution, turbulence model and local smoothing method on the accuracy of the simulated wind flow field is discussed in detail, by comparing with wind tunnel test and corresponding code data.Based on the basic grid scheme and realizable k-ε turbulence model, the simulation result agrees well with the wind tunnel data, despite discrepancy of wind pressure coefficients at the separation point of the slope top.By adopting second-order transition curve based local smooth measure at the slope top corner, good agreement can be ensured for both the simulated wind pressure coefficient and the wind velocity ratio with wind tunnel test results.Moreover, the simulation accuracy becomes better when the horizontal distance of the local smooth transition section gets shorter.The terrain speed-up effect obtained by present numerical simulation method is in good agreement with the wind tunnel test results reported in the literature, the corresponding Chinese and Australian codes. |
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