【摘要】 为保证某型天线的指向稳定性和结构安全性,采用基于Spalart-Allmaras方程模型的DES方法,对其简化的非等径旋成体进行了非定常流动数值模拟研究。计算结果表明,对于变直径圆柱,各等直径段在长径比足够大时仍能使各段大部分区域保持稳定的周期性涡脱落;各段涡街的频率与来流速度、当量直径之间仍符合Strouhal关系式。研究结果可为各类非等径圆柱在不同风荷载下的结构安全性分析提供依据。更多还原

【Abstract】 In this paper,unsteady numerical simulation has been carried out on the simplified non-equal diameter cylinder using the DES method based on Spalart-Allmaras equation model to ensure pointing stability and structural safety of a certain type antenna.The results show that each level can still maintain stable periodical vortex shedding phenomenon when the length-diameter ratio is large enough for the non-equal diameter cylinder;the vortex shedding frequency of each level,the flow velocity and the equivalent diameter still accord with the Strouhal relationship.The conclusions can provide the basis for structural safety analysis of all kinds of non-equal diameter cylinder under different wind loads.更多还原