A Mechanism for the Excitation of Coherent Structures in the Wall Region of a Turbulent Boundary Layer
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摘要: 应用直接数值模拟的方法，研究了湍流边界层近壁区由于外区扰动的作用而导致相干结构产生的问题．结果表明：在湍流边界层近壁区的上边界存在的速度扰动，可以在近壁区内激发出相干结构，从而完善了单个相干结构的理论模型．Abstract: The problem of how the coherent structures in the wall region of a turbulent boundary layer could be excited by the disturbances from the outer region was investigated by using direct numerical simulation(DNS)method.The results show that velocity disturbances at the upper boundary of the wall region could excite coherent structures in the wall region,thus offering a more comprehensive model for individual coherent structures.
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Key words:
- turbulent boundary layer /
- coherent structures /
- excitation
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