NUMERICAL SIMULATION OF DECAYING TURBULENCE IN THE PRESENCE OF FREELY MOVING BUOYANT SOLID PARTICLES OF FINITE-SIZE

Шекті өлшемдегі еркін қозғалатын қалқымалы қатты бөлшектердің қатысуымен ыдырайтын турбуленттікті сандық модельдеу
Численное моделирование затухающей турбулентности в присутствии свободно движущихся плавучих твердых частиц конечного размера
Zhakebayev D.B. Bakytbek Y. Karzhaubayev K.K.
25 December 2025 al-Farabi Kazakh State National University

KazNU Bulletin. Mathematics, Mechanics, Computer Science Series
2025 #128 Issue 4 108 - 121 pp.

We present interface-resolved direct numerical simulations of decaying homogeneous isotropic turbulence laden with finite-size spherical particles. The fluid phase is solved using the lattice Boltzmann method (LBM) coupled with the interpolated bounce-back (IBB) scheme to impose no-slip boundary conditions at moving particle surfaces. The accuracy of the method is verified against benchmark cases, including the settling sphere experiment of ten Cate et al. and pseudo-spectral simulations of single-phase turbulence. Simulations are performed at an initial Taylor-scale Reynolds number in the range of Re_λ = 20 − 45 for particle volume fraction of 2.5%. The results show that finite-size particles enhance small-scale flow structures and accelerate the decay of turbulent kinetic energy compared to the single-phase case. Energy spectra analysis reveals a redistribution of energy from large to small scales. These findings provide new insights into turbulence modulation mechanisms in particle-laden flows and demonstrate the applicability of LBM for fully resolved particle–turbulence interaction studies.

DNS , LBM , multiphase , particle-laden , turbulence

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Al-Farabi Kazakh National University, Almaty, Kazakhstan
National Engineering Academy of Republic of Kazakhstan, Almaty, Kazakhstan
Nazarbayev Intellectual school of Science and Mathematics, Almaty, Kazakhstan

Al-Farabi Kazakh National University
National Engineering Academy of Republic of Kazakhstan
Nazarbayev Intellectual school of Science and Mathematics

10 лет помогаем публиковать статьи Международный издатель

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