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About: Ensemble (fluid mechanics)     Goto   Sponge   NotDistinct   Permalink

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In continuum mechanics, an ensemble is an imaginary collection of notionally identical experiments. Each member of the ensemble will have nominally identical boundary conditions and fluid properties. If the flow is turbulent, the details of the fluid motion will differ from member to member because the experimental setup will be microscopically different; and these slight differences become magnified as time progresses. Members of an ensemble are, by definition, statistically independent of one another. The concept of ensemble is useful in thought experiments and to improve theoretical understanding of turbulence.