土工离心机风阻计算方法的对比研究

Comparative Study on Estimation Methods of Wind Resistance of Geotechnical Centrifuges

目的评估不同土工离心机风阻功率估算方法的效果和优缺点,为工程应用及未来研究发展方向提出建议。方法重点以土工离心机为例,总结几种有代表性的计算方法,系统分析不同方法之间的共性和差异。通过一个算例,同时结合以往离心机的设计经验,对各种方法的效果进行对比。结果法国方法、美国方法、中国工程物理研究院方法和CFD仿真方法在精度上依次增大,但复杂性依次升高,后两种方法不需借助试验来确定参数。结论对于中低速土工离心机,中国工程物理研究院方法具有较大的优势。随着土工离心机向着高速、大规模方向发展,经典解析方法的适用性尚未得到充分验证,基于CFD的高置信度仿真是一种较好的解决方案。

Objective To evaluate effects and pros-and-cons of different estimation methods for wind resistance of ge-otechnical centrifuges, and provide suggestions on engineering application and future research. Methods Geotechnical centrifuge was mainly taken as example to introduce several typical calculation methods and systematically analyze commonness and difference among the methods. The effects of different methods were compared by a classical example combined with design experience on centrifuges. Results French Methods, US Method, CAEP Method and CFD Simula-tion had a successively increasing accuracy with a successively increasing complexity. Meanwhile the later two did not depend on experimenting data in determination of parameters. Conclusion For geotechnical centrifuges working at low-to medium speeds, the CAEP method has an advantage over others in engineering practice. But as the development of ge-otechnical centrifuges to the direction of large scales and high speeds, the validity of traditional analytical methods is still not examined. High fidelity methods based on CFD seems a good option.