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Large eddy simulation of vertical turbulent jets under JONSWAP waves

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Abstract

The effect of random waves on vertical plane turbulent jets is studied numerically and the mechanism behind the interaction of the jet and waves is analyzed. The large eddy simulation method is used and the σ-coordinate system is adopted. Turbulence is modeled by a dynamic coherent eddy model. The σ-coordinate transformation is introduced to map the irregular physical domain with a wavy free surface and an uneven bottom onto a regular computational domain. The fractional step method is used to solve the filtered Navier-Stokes equations. Results presented include the distribution of velocity, the decay law of the mean velocity along the jet axis, self-similar characteristics and volume flux per unit width. In particular, the role of coherent structures on the momentum transfer along the jet centerline and the jet instantaneous characteristics in JONSWAP waves are a special focus of this research. The numerical results obtained are of great theoretical importance in understanding the behavior of turbulent jets in random wave environments.

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Authors and Affiliations

  1. College of Water Conservancy and Hydro-power Engineering, Hohai University, 210098, Nanjing, China

    Jun Lu, Ling-Ling Wang, Hong-Wu Tang & Hui-Chao Dai

  2. Binhu Water Resource Bureaus, 214011, Wuxi, China

    Jun Lu

Authors
  1. Jun Lu
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  2. Ling-Ling Wang
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  3. Hong-Wu Tang
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  4. Hui-Chao Dai
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Corresponding author

Correspondence to Ling-Ling Wang.

Additional information

The project was supported by the National Natural Science Foundation of China (50679023, 50879019), Ph.D. Programs Foundation of Ministry of Education of China (20070294012), the National Science Fund for Distinguished Young Scholars (50925932), Outstanding Doctoral Dissertation Incubation Program of Hohai University (2010B18814), Qing Lan Project of Jiangsu Province, and 333 High-Level Talent Training Program of Jiangsu Province (2017-B08038).

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Lu, J., Wang, LL., Tang, HW. et al. Large eddy simulation of vertical turbulent jets under JONSWAP waves. Acta Mech Sin 27, 189–199 (2011). https://doi.org/10.1007/s10409-011-0429-9

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  • DOI: https://doi.org/10.1007/s10409-011-0429-9

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