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A COMPARATIVE STUDY OF FREE ENERGY BASED LATTICE BOLTZMANN MODELS FOR TWO-PHASE FLOW
N. Jeong(정남균) 한국전산유체공학회 2019 한국전산유체공학회지 Vol.24 No.2
For the design of nuclear facilities, comprehensive understanding for two-phase flow phenomena is needed. Because of limitations of experimental and theoretical approach, numerical analysis has been applied together to identify the mechanism of two-phase flow. For the numerical analysis, the lattice Boltzmann(LB) model for two-phase flow has been remarkably developed as an alternative tool. Especially, free energy based LB models have been showing stable solutions for high density ratio up to 1:1000. Although they are free-energy based models of the same concept, the LB equations used in the models differ. Therefore each method needs to be compared to identify its own characteristic. In this study, the pros and cons of two representative LB models are compared. For the test, moving liquid droplet in the enclosed gas and rising bubble in the heavier fluid are simulated, and the results of two LB models are compared with those of VOF (Volume of Fluid) method.
격자 볼츠만 방법을 이용한 미세 섬유 다공성 매질의 투과율에 관한 수치적 연구
조현준(H. Cho),정남균(N. Jeong),성형진(H.J. Sung) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
We calculated the permeability of micro-scale fibrous porous media using the lattice Boltzmann method. We constructed two models of overlapping fibers, and another two models of non-overlapping fibers. The effect of fiber overlapping on the permeability is investigated. The overlapping fibers yield up to 2 times larger value of permeability than the non-overlapping fibers. As the diameter of fiber increases, the fibers act as the granular inclusions. However, we obtained a correlation between the permeability and the porosity, which is useful in a wide range of the porosity, and is applicable to all fiber arrangements.