Simulation and Analysis of Turbulent Free Surface Flow in the Slab Casting.

摘要

On the basis of the dynamic analysis for turbulent free surface flow, the authors proposed a concept of eddy surface tension and its mathematical model was presented. With this proposed eddy surface tension model, simulated free surface waves for water flow in the water modeling mould attained a good agreement with experimentally measured ones. Comparison with fixed surface simulation shows that free surface flow simulation has an exclusive advantage in depicting free surface related phenomena. In addition to the priority of giving the geometrical shape of the free surface, free surface simulation also shows an obvious difference in the velocity distribution on and near the free surface. The present research via CFD computation finds that results from water modeling experiment may have remarkable error in predicting the free surface phenomena of steel motion in the mould. On this ground, a series of simulations were performed for the steel free surface flow in the slab mould with a variety of casting speeds, mould sizes, and immersion depths of the nozzle, and nozzle inducing angles. With increase of the casting speed while other parameters retain fixed, the surface kinetic energy, surface velocity, surface wave height, surface oscillation frequency and penetration depth of steel flow become greater. Change of the mould size shows complicated regularities.