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模拟环形截面流道内往复振荡流动，边界条件设置为正弦速度入口,余弦压力出口。理论及文献中曲线在180度时分界，而我的模拟结果发现曲线随周期呈整体右移趋势，在15周期分界点移动到192度。请教各位老师这是什么原因？
