回転乱流場におけるバースト過程の条件付き平均と確率モデル : 流体工学 , 流体機械

概要

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Coherent structures or large scale motions in a turbulent boundary layer on a rotating cylinder in a quiescent fluid are considered by various conditional sampling procedures. As it is clear from previous investigations that the coherent structures are depending on the conditional technique of sampling, here we discuss some dynamical aspects of them. Several conditional sampling procedures are adopted here, and also the variable interval time average (VITA) technique is modified with a reasonable assumption. Turbulent velocity signal and a random process generated by a Langevin equation are analyzed by these techniques. With comparing these results, we found that statistial properties of the coherent structure are well modeled by the Langevin equation as far as the conditional sampling is assigned.
2001-02-25