摘要
以苏格兰Askervein小山为例,基于Fluent流体计算平台,结合NURBS地形建模方法,模拟了实际地形下的风场分布。分别在粗糙度长度为0～0.05m的情况下进行CFD风场模拟试验。与实测的风速加速比进行比较,发现模拟所得的风速加速比均方根误差在迎风面保持在6%以内,而背风面最大为26.56%,表明粗糙度条件对CFD风场模拟结果有较大影响。实现了用于CFD风场模拟的下垫面粗糙度精细化方法。在迎风坡和背风坡设置不同粗糙度长度的情况下,风速加速比均方根误差减小为7.42%,模拟结果在背风坡区域有明显改善。最后指出,在进行复杂地形风场CFD数值模拟时,有必要进行粗糙度条件的精细化设置。
By employing NURBS technologies for natural terrain modeling, CFD wind field simulation over the Askervein hill of Scotland was performed using Fluent software. Wind field simulations were carried out under different settings of roughness length between 0 and 0.05m. By comparing wind speed-up ratios of simulations with that of along two lines, results have shown that root mean square error （RMSE） of wind speed-up ratio is within 6% for the windward slope, while it reaches 26.56% for the leeward slope. The simulations have shown that roughness parameter can greatly influence the accuracy of CFD wind field simulation. Further, the wall roughness refinement experimental schemes have been tested. Different roughness lengths are designated for windward slope and leeward slope, simulations show the RMSE of wind speed-up ratio reduces to 7.42%, which gains obvious improvement in CFD simulation, especially for the leeward slope with relative low speed. Finally, the results indicate that it is necessary to refine roughness conditions in CFD wind field simulation in complex terrain regions.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2010年第12期1644-1648,共5页
Acta Energiae Solaris Sinica
基金
国家高技术研究发展(863)计划项目(2008AA05Z414)
关键词
CFD
风场数值模拟
实际地形
粗糙度
CFD
wind field numerical simulation
natural terrain
roughness
