Multiphase turbulence mechanisms identification from consistent analysis of direct numerical simulation data

Ben Magolan; Emilio Baglietto; Cameron Brown; Igor A. Bolotnov; Gretar Tryggvason; Jiacai Lu

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자료유형: 학술저널

저자정보: Ben Magolan Emilio Baglietto Cameron Brown Igor A. Bolotnov Gretar Tryggvason Jiacai Lu

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제49권 제6호

발행연도: 2017.1

수록면: 1,318 - 1,325 (8page)

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Direct Numerical Simulation (DNS) serves as an irreplaceable tool to probe the complexities of multiphase flow and identify turbulent mechanisms that elude conventional experimental measurement techniques. The insights unlocked via its careful analysis can be used to guide the formulation and development of turbulence models used in multiphase computational fluid dynamics simulations of nuclear reactor applications. Here, we perform statistical analyses of DNS bubbly flow data generated by Bolotnov (Reτ = 400) and LueTryggvason (Reτ = 150), examining single-point statistics of mean and turbulent liquid properties, turbulent kinetic energy budgets, and two-point correlations in space and time. Deformability of the bubble interface is shown to have a dramatic impact on the liquid turbulent stresses and energy budgets. A reduction in temporal and spatial correlations for the streamwise turbulent stress (uu) is also observed at wall-normal distances of y＋ = 15, y/δ = 0.5, and y/δ = 1.0. These observations motivate the need for adaptation of length and time scales for bubble-induced turbulence models and serve as guidelines for future analyses of DNS bubbly flow data.

#Budget Equations #Bubble-Induced Turbulence #DNS #M& #amp #C2017 #Multiphase CFD

참고문헌 (28)

참고문헌 신청

A. Esmaeeli / 1999 / Direct numerical simulations of bubbly flows : Part 2. Moderate Reynolds number arrays / J. Fluid Mech 385 : 325 ~

A. Serizawa / 1990 / Turbulence suppression in bubbly two-phase flow / Nucl. Eng. Des 122 : 1 ~

A. Troshko / 2001 / A two-equation turbulence model of turbulent bubbly flows / Int. J. Multiphase Flow 27 : 1965 ~

B. Bunner / 2003 / Effect of bubble deformation on the stability and properties of bubbly flows / J. Fluid Mech 495 : 77 ~

C. Brown / 2016 / Spectral analysis of single-and two-phase bubbly DNS in different geometries / Nucl. Sci. Eng 184 : 363 ~ 376

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