地形对山地丘陵风场影响的数值研究-结构工程专业论文.docxVIP

摘要 摘要 浙江大学硕士学位论文 Numerical Study of Terrain Influence on The Airflow over Hilly Land Abstract While air flows hilly lands，the complex terrain features and physiognomy will observably change turbulence characteristic，wind speed and wind pressure ofboundary-layer flow, which results in hilly land’S flow envhomn∞t is much different fiom plat land’s and results in the d／slributing of wind speed and wind pressure is much anomalistic．So，to research about the characteristic of flow field distributing in hilly and the roles of flow change results from variety hill 11ei91l‘slope and variety ailflow angle is significant for both choosing an appropriate city address in hilly lands and wind resistance design． By adopting numerical model method which bases on Computational Fluid Dyllamic$，in the first place，for 2D model，it systemically computed and analyzed the airflow field(such wind speed,wind pressure and turbulence characteristic)oftypical terrain,discussed the influence laws of single hill’S slope angle，relative size of crest and valley wind speed ofhilltop，turbulence flame．wind profile and SO on．The interaction between variety height hills in double hill terrain is also discussed．And then,for 3D model，the wind speed and wind pressure distributing of single hill with diverse slope is researched．Based on it．the principle and process of narrow channels effect forming is showed visually and the change of airflow field in the valley and out of the valley under different wind angle is studied．In the end，considering real terrain,a complex hilly model Was formed by three single hilis of different heights，different slope，whose airflow characteristicWasresearchedunderdifferentwindangle． By comparing and analyzing，it is concluded that for simple and slow slope terrain，the change of wind speed around hill Can be饥lly calculated by some experimental form