Impeller Modeling with Velocity Data

The impeller is modelecl by fixing Itie liquid velocities in te outflow zone based on measured data. 

The flow penem In the test of the vessel Is then oalculaltd using these fixed velocities as sboundary eondMon. j 

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Volume of Fluid Model. In stirred tank applications, the volume of fluid (VOF) free surface model is useful for tracking the shape of the liquid surface during operation. This includes the transition to a parabolic shape during startup, which can lead to the (undesired) drawdown of air. The velocity data model can be used in 2D or 3D for simulations of this type. The VOF model can have a steady or time-dependent implementation, and both are fiilly compatible with this steady-state treatment of the impellers. 

S-4.4.2 Multiphase Model. Both solids suspension and gas sparging can be simulated using an experimental data model for the impeller. The manner in which the multiphase parameters are input depends on the multiphase model being used. For solids suspension, an Eulerian granular multiphase model is recommended, and separate sets of momentum equations are used for the liquid and solids phases. This model, run in a time-dependent fashion, is fully compatible with the time-averaged representation of the impellers. Experimental velocity data are set as a boundary condition independently for each of the phases. Note,... 

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