Fluent时均值?

1.Fluent瞬态计算中，启用Data sampling for time statistic，其中的Sampling interval指的是什么？它与number of time steps什么关系？ 2.fluent文档中提到"note that gathering data for time statistics is not meaningful inside a moving cell zone(for example，a sliding zone in a sliding mesh problem,a moving zone in a dynamic mesh problem）"应该如何理解？旋转工况是不需要考察流场的时均值么...