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In this study, a spatial spectral analysis of turbulent plane wall jets is conducted using two-dimensional particle image velocimetry (2D-PIV) at three different nozzle Reynolds numbers: 10,244, 15,742, and 21,228. To accomplish this, four cameras are positioned side-by-side, capturing the longest field of view in the study of wall jets. The obtained PIV fields are utilized to construct spatial spectra, aiming to understand the model spectral contribution to the variance of velocity fluctuations and Reynolds shear stress. The study reveals that the jet mode exhibits wavelengths that scale with the jet length scale, denoted as \(z_{T}\) . This mode contains two dominant submodes with wavelengths of 5 \(z_{T}\) and 2.5 \(z_{T}\) respectively. In the region above, the velocity maximum, the presence of the jet mode is observed, while the region below it exhibits a robust bimodal behavior attributed to both the wall and jet modes.

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Spectral Analysis of Plane Turbulent Wall Jets Using PIV

  • 会议论文

  • 发表日期：

    2025年

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  • Harish Choudhary,
  • Abhishek Gupta,
  • Shibani Bhatt,
  • Pranav Sood,
  • Prajyot Sapkal,
  • Thara Prabhakaran,
  • Anandakumar Karipot,
  • Shivsai Ajit Dixit

摘要

In this study, a spatial spectral analysis of turbulent plane wall jets is conducted using two-dimensional particle image velocimetry (2D-PIV) at three different nozzle Reynolds numbers: 10,244, 15,742, and 21,228. To accomplish this, four cameras are positioned side-by-side, capturing the longest field of view in the study of wall jets. The obtained PIV fields are utilized to construct spatial spectra, aiming to understand the model spectral contribution to the variance of velocity fluctuations and Reynolds shear stress. The study reveals that the jet mode exhibits wavelengths that scale with the jet length scale, denoted as \(z_{T}\) . This mode contains two dominant submodes with wavelengths of 5 \(z_{T}\) and 2.5 \(z_{T}\) respectively. In the region above, the velocity maximum, the presence of the jet mode is observed, while the region below it exhibits a robust bimodal behavior attributed to both the wall and jet modes.