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Direct Numerical Simulation of Subsonic Round Turbulent Jet

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Abstract

Direct numerical simulation(DNS) of spatially developing round turbulent jet flow with Reynolds number 4,700 was carried out. Over 20 million grid points were used in this simulation. Fully compressible three-dimensional Navier–Stokes equations were solved. High order explicit spatial difference schemes and Runge–Kutta time integration scheme were used to calculate derivatives and time marching, respectively. Non-reflecting boundary conditions and exit zone techniques were adopted. Some refined computational grids were used in order to capture the smallest turbulent structures near the centerline of the jet. Low level disturbance were imposed on the jet inflow velocity to trigger the developing of turbulence. Turbulent statistics such as mean velocity, Reynolds stresses, third order velocity moments were obtained and compared with experimental data. One-dimensional velocity autospectra was also calculated. The inertial region where the spectra decays according to the k − 5/3 was observed. The quantitative profiles of mean velocity and all of the third order velocity moments which were difficult to measure via experimental techniques were presented here in detail. The jet flow was proven to be close to fully self-similar around 19 jet diameters downstream of jet exit. The statistic data and revealed flow feature obtained in this paper can provide valuable reference for round turbulent jet research.

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Authors and Affiliations

  1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, 310027, People’s Republic of China

    Zhihua Wang, Pei He, Yu Lv, Junhu Zhou, Jianren Fan & Kefa Cen

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  1. Zhihua Wang
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  2. Pei He
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  3. Yu Lv
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  4. Junhu Zhou
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  5. Jianren Fan
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  6. Kefa Cen
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Correspondence to Zhihua Wang.

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Wang, Z., He, P., Lv, Y. et al. Direct Numerical Simulation of Subsonic Round Turbulent Jet. Flow Turbulence Combust 84, 669–686 (2010). https://doi.org/10.1007/s10494-010-9248-5

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  • DOI: https://doi.org/10.1007/s10494-010-9248-5

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