Abstract
Two-way interaction-mediated modification of isotropic turbulence and bubble dispersion is investigated using direct numerical simulations. The asymmetric coupling force on vortical structures generates horizontal force gradients, transiently enhancing the flow vorticity, while the cumulative buoyant transfer induced by bubbles in the downflow regions decreases it by attenuating the horizontal gradients of the downward flow velocity. These vorticity fluctuations affect the non-uniform distortion in the flow dissipation spectrum with a large-scale energy reduction, decreasing the flow dissipation. In addition, the buoyancy force acting on the bubbles affects the bubble distribution. Smaller inhomogeneities in the bubble distribution with turbulence attenuation, owing to the two-way coupling effects, also contribute to the bubble dispersion.
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We acknowledge the support by Samsung Science and Technology Foundation (Grant No. SSTF-BA1702-03).
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Hyoeun Shim is a graduate student of the School of Computational Science and Engineering, Yonsei University, Seoul, Korea. She received her master degree in Computational Science and Engineering from Yonsei University.
Changhoon Lee received his B.S. (1985) and M.S. (1987) from Seoul National University, Seoul, Korea and Ph.D. (1993) from UC Berkeley, USA in Mechanical Engineering. He is a Professor in the Department of Mechanical Engineering & School of Mathematics and Computing, Yonsei University, Korea. His research interests include fundamentals of turbulence, particle-turbulence interaction, numerical algorithms, air pollution modeling, stochastic processes and deep learning of turbulence.
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Shim, H., Lee, C. Two-way interaction between isotropic turbulence and dispersed bubbles. J Mech Sci Technol 35, 1527–1537 (2021). https://doi.org/10.1007/s12206-021-0317-6
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DOI: https://doi.org/10.1007/s12206-021-0317-6