A Study of Two-Phase Flow and Phase Change Using Interface Calculation Procedure
Flows involving two immiscible fluids can be found in nature environment or engineering systems. Experiments were often employed to study such flow problems. However, the fast development of numerical methods in the past has made CFD an important tool for such flow analysis. The most important issue in analyzing these flows is to predict the sharp interface between the two fluids accurately. This is especially true in the two-phase flow of liquid and vapor because the great differences in density and viscosity between the two phases cause difficulties in numerical calculations. In the past several years, we have developed two numerical schemes for interfacial flows. One is of interfacecapturing type which blends high-resolution differencing schemes with bounded downwind scheme. Another is of interface-tracking type which uses interface reconstruction technique together with a predictor-corrector procedure. Numerical dissipation and dispersion can be overcome and the interface can be accurately predicted. These methods are going to be further developed and extended to deal with three-dimensional problems. In the first year of this project, we will study the phenomenon of bubble formation as air flows into a tank filled with liquid. Another concern is the impact of a liquid droplet on a solid wall. The target of the second year is to take account of phase change in the two-phase flows. Vaporization models will be added into the calculation procedure. In the last year, we will study the film boiling problems using the developed methods.
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