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mean flow
In fluid dynamics, the fluid flow is often decomposed into a mean flow – and deviations from the mean. The averaging can be done either in space or in time, or by ensemble averaging.
==Example==
Calculation of the mean flow may often be as simple as the mathematical mean: simply add up the given flow rates and then divide the final figure by the number of initial readings.
For example, given two discharges (''Q'') of 3 m³/s and 5 m³/s, we can use these flow rates ''Q'' to calculate the mean flow rate ''Q''mean. Which in this case is ''Q''mean = 4 m³/s.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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