湍流相干结构与小尺度结构之间的相互作用
lnteraction of Turbulent Coherent Structures and Small Scale Structures
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摘要: 本文首先对切变湍流场中存在大尺度相干结构与小尺度结构和不同尺度结构之间的相互作用进行了试验研究,得到了一些特征值,其次,在试验的基础上,建立了考虑不同尺度结构之间的相互作用后相干结构的数学描述和模式识别方法,并对光滑壁面与均匀密集加糙壁面条件下湍流边界层中的相干结构进行了模式识别。结果表明,文中所建立的计算方法是可行的。Abstract: In this paper experimental research is carried out for the existence of large andsmall scale.structures in turbulent boundary layer and the interactions between these structures.Based on the experimental results,a new method is suggested to discribe the coherent strucures in which the interactions between between the coherent and small-scale slructures are considered,Using this method a new pattern recognition method is suggested and used for the coherent structures in turbulent boundary layer in smooth and rough well conditions.The results show that the suggested method is reasonable.
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Key words:
- coherent structures /
- small scale structures /
- turbulent
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