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자료유형
학술대회자료
저자정보
최석기 (한국원자력연구원) 김성오 (한국원자력연구원)
저널정보
한국전산유체공학회 한국전산유체공학회 학술대회논문집 한국전산유체공학회 2011년도 추계학술대회
발행연도
2011.11
수록면
366 - 373 (8page)

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A study on the computation of laminar and turbulent natural convection with the lattice Boltzmann method(LBM) is presented. First, a comparative analysis of thermal models in the LBM for the simulation of natural convection in enclosures is presented. A HYBRID method, in which the thermal equation is solved by the Navier-Stokes equation method while the mass and momentum conservation are resolved by the LBM, is introduced and its merits are explained. All the governing equations are discretized on a cell-centered, non-uniform grid using the finite-volume method. The convection terms are treated by a second-order central-difference scheme with a deferred correction method to ensure stability of the solutions. The HYBRID and double-population LBM are applied to the simulation of laminar natural convection in square cavity and the predicted results are compared with the benchmark solutions given in the literatures. The predicted results are also compared with those by the Navier-Stokes equation method. In general, the present HYBRID method is as accurate as the Navier-Stokes equation method and the double-population LBM. The HYBRID method shows better convergence and stability than the double-population LBM. The present HYBRID LBM is also applied to the prediction of a turbulent natural convection in a rectangular cavity and the computed results are compared with the experimental data. The elliptic-relaxation model is employed for the turbulence model and the turbulent heat fluxes are treated by the algebraic flux model. It is shown that the LBM with the present HYBRID thermal model predicts the mean velocity components and turbulent quantities accurately which are as good as those by the conventional finite-volume method.

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UCI(KEPA) : I410-ECN-0101-2013-422-001395929