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Effect of thermal buoyancy on Fluid Flow and Inclusion Motion in Tundish without Flow Control Devices——Part Ⅰ: Fluid Flow

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Journal of Iron and Steel Research International 2005年第5期12卷 20-27页

作者： ZHANGLi-feng ZHIJian-jun MOUJi-ning CUIJian UniversityofIllinoisatUrbana-Champaign UrbanaIL61801USA BaoshanIronandSteelCo Shanghai201900China

The κ-ε two-equation model is used to simulate the fluid flow in the continuous casting tundish coupling with the effect of thermal buoyancy. The natural convection induced by the thermal buoyancy generates an upward flow pattern especially at the outlet zone, and has little effect on the fluid flow in the inlet zone. The maximum viscosity is 700 times larger than the laminar viscosity, which indicates the strong turbulent flow in the tundish. The maximum temperature difference in the whole tundish is 82 K. The temperature near the stopper rod and the short wall is obviously lower than that in the inlet zone. The existence of the stopper rod has a big effect on the fluid flow entering the SEN and the mold. All the characteristics of the tundish geometry should be considered to accurately simulate the fluid flow in the tundish.

关键词： thermal buoyancy fluid flow tundish inclusion stopper rod temperature

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Three-dimensional prediction of reservoir water temperature by the lattice Boltzmann method: Validation

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Journal of Hydrodynamics 2015年第2期27卷 248-256页

作者：刁伟程永光张春泽吴家阳 State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University

The water temperature stratification in large reservoirs might have serious ecological and environmental consequences. The modeling of the temperature distribution and its history is of great importance both for studying the underlying mechanisms and for controlling the adverse effects. To develop an effective and efficient method for simulation of temporal and spatial temperature variations, a lattice Boltzmann method（LBM） model for 3-D thermal buoyancy flows is proposed and validated by the temperature data measured in a model reservoir. This paper discusses important aspects of the LBM and its turbulence model, analyzes the gravity sinking mechanism of cold currents, and demonstrates the complexity of the temperature redistribution process. Good agreement between the simulated and measured results shows that the newly developed method is feasible and powerful, and it will be used for the water temperature prediction in actual reservoirs in a near future.

关键词： lattice Boltzmann method(LBM) thermal buoyancy reservoir water temperature multi-dimensional simulation

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