Hybrid high order lattice Boltzmann scheme for turbulent convective-radiative heat transfer problems
| Parent link: | Chinese Journal of Physics.— .— Тайчжун: Physical Society of Taiwan Vol. 96.— 2025.— P. 425-438 |
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| Summary: | Title screen This paper presents a numerical solution of combined heat transfer problem by turbulent natural convection and surface thermal radiation. For the first time, the high order hybrid lattice Boltzmann model was built to study turbulent convective-radiative heat transfer. Under this model, thermally-induced flow is described by the mesoscopic lattice Boltzmann equations with high order regularization procedure. Alternatively, heat transfer is computed using the fourth order Runge-Kutta scheme when solving the macroscopic energy equation. The radiosity-irradiation approach is used as a radiation model. The high order hybrid lattice Boltzmann model was carefully tested against benchmark solution of various heat transfer problems presented by other researchers. Variation range of the Rayleigh number, conduction-radiation number and surface emissivity is as follows 1010≤Ra≤1011, 351.75≤Nr≤757.88 and 0.2≤ε≤1, respectively. Numerical analysis of the first and the second order statistics in terms of temperature, turbulent kinetic energy, etc. was performed. It is found that thermal plumes of different scales are formed at the thermally-insulated walls due to their irradiation when ε≥0.6. This results in the irregular thermal behavior near the horizontal boundaries. Surface radiation decreases the temperature variance whereas the turbulent kinetic energy and root mean square velocity are enhanced. Moreover, the total mean Nusselt number is decreased up to 14 % when surface emissivity is enhanced from 0.2 to 1. The time-averaged data are presented in this work for validation purposes of semi-empirical turbulence models Текстовый файл AM_Agreement |
| Published: |
2025
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| Online Access: | https://doi.org/10.1016/j.cjph.2025.05.015 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=680864 |