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在方柱计算中,对升力系数进行FFT分析,取样数据点在10000左右,得到如下结果,主频与实验较为吻合,在高频处出现谐振,是由于方柱前缘分离剪切层中K-H不稳定性导致的升力系数高频振荡吗?谐振又是怎么产生的呢? 诚心向各位前辈请教,求指导!