Abstract
Direct numerical simulations are performed to investigate the behavior of the rotational and shear motions in a temporally evolving planar jet flow. For an accurate evaluation of the turbulent/nonturbulent interface, a fine grid mesh setting is adopted, i.e., the mesh size is comparable to the Kolmogorov length scale along the centerline. The results from flow visualization imply that there are continuous pure shear layers at the outer edge of the interface with characteristics similar to the well-known viscous superlayer. It should be noted that the pure shear regions are weakly negatively correlated with the viscous diffusion term. Moreover, pairs of parallel positive and negative viscous diffusion layers can be identified close to the TNTI and also deep inside the turbulent region. Tubelike structures and sheetlike structures can be found in the rotation and shear fields. In terms of the enstrophy transfer process, on average the rotational fluid motions tend to be associated with the high values of enstrophy production and the irrotational motions acquire the enstrophy through the viscous diffusion effects.
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Acknowledgements
This work was in part supported by the National Natural Science Foundation of China (No. 91952105), the Six Talent Peaks Project in Jiangsu Province (No. 2019-SZCY-005), and the Fundamental Research Funds for the Central Universities (No. 30921011212). Part of the work was performed on Hefei advanced computing center.
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Xie, Y., Yin, W., Zhang, X. et al. Visualization of the rotational and irrotational motions in a temporally evolving turbulent plane jet. J Vis 26, 1025–1036 (2023). https://doi.org/10.1007/s12650-023-00927-1
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DOI: https://doi.org/10.1007/s12650-023-00927-1