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A Study On Correlation Moments Of Two-Phase Fluctuating Velocity Using Direct Numerical Simulation

Author

Listed:
  • BING WANG

    (School of Aerospace, Tsinghua University, Beijing 100094, P. R. China)

  • WEI WEI

    (School of Aerospace, Tsinghua University, Beijing 100094, P. R. China)

  • HUIQIANG ZHANG

    (School of Aerospace, Tsinghua University, Beijing 100094, P. R. China)

Abstract

Existing models of two-phase fluctuating velocity correlation moments are unsatisfactory because of their inability to clearly identify the dependency of two-phase velocity covariance on fluid- and particle-phase velocity second moments. This is especially true of wall-bounded turbulent flows. In this paper, the statistical fluctuating velocity of both phases in particle-laden turbulent channel flows were obtained numerically by means of direct numerical simulation (DNS) coupled to the Lagrangian particle trajectory method. The effects of particle Stokes number on the scaling of two-phase fluctuating velocity correlation moments were analyzed considering effects of flow inhomogeneity. An improved two-phase correlation closure model of exponential decay with emphasis on the particle-phase kinetic energy was then proposed based on the results of an evaluation of five existing models. This new model was found to be better than previous models, which used local equilibrium assumption. The present investigations may facilitate understanding of two-phase flow physics and the construction of models capable of predicting the movements of particle-laden turbulent flows accurately using Reynolds-averaged Navier–Stokes (RANS) methods.

Suggested Citation

  • Bing Wang & Wei Wei & Huiqiang Zhang, 2013. "A Study On Correlation Moments Of Two-Phase Fluctuating Velocity Using Direct Numerical Simulation," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 24(10), pages 1-17.
  • Handle: RePEc:wsi:ijmpcx:v:24:y:2013:i:10:n:s012918311350068x
    DOI: 10.1142/S012918311350068X
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