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在Openfoam中的时变边界条件中的多项式设置如图 如何实现在多项式上添加时间段的限制 例如：0＜t＜1，velocity = 0.1 + 1.3x^2 + 2.7x^3 1≤t＜2，velocity = 2x^2 + 22x^3 这种应该如何添加时间段限制
