Experimental investigation of the velocity time-traces of the turbulent flow in a rectangular channel with a lateral slot

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• 作者：Tiago de Melo^a ; ^{tiago.melomec@gmail.com} ; Jhon N.V. Goulart^a ; ^jvaz@unb.br ; Carla T.M. Anflor^a ; ^{anflor@unb.br} ; Elizaldo dos Santos^b ; ^{elizaldodosantos@furg.br}
• 关键词：Turbulent flow ; Wavelets transform ; Coherent structures ; Compound channels ; Hot wires probes
• 刊名：European Journal of Mechanics - B/Fluids
• 出版年：2017
• 出版时间：March-April 2017
• 年：2017
• 卷：62
• 期：Complete
• 页码：130-138
• 全文大小：2034 K
• 卷排序：62

文摘

Classic approach through PSD and Continuous Wavelet Transform (CWT) was employed as a novelty in the time-traces of velocity in a simulated compound channel. The Strouhal number gets close to those previously noticed in the literature as the channel becomes longer. Large vortices formation were found to depend on the channels length and the gap width. CWT revealed that different frequencies are excited as the time passes causing the broadness of the main frequencys peak in PSD. Some degree of unsteadiness of the coherent motion could be seen from higher energetic coefficients computed in CWT.