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Algebraic slip model in ANSYS Fluent

The simplified multipart multiphase model uses the algebraic equation for slide-thrust velocities. Using this method, the processing time and numerical simulation complexities are reduced. However, this method only applies to multiphase flows, where the density and diameter of the dispersed phase are low, and the force governing on the particle is the only force of the drag. Select the continuous phase as the limiting component. Select each dispersed phase as the “Algebraic Slip” component. A specific rule to calculate must be selected as the drag force. As a result, slide velocity is calculated by using the solver. You can also use a custom function defined by the user to calculate the drag force. To calculate the turbulence distribution, we use the standard gradient penetration hypothesis which is controlled by using a Prandtl number of turbulence. The walls can be placed as Deposition Walls. In this case, the dispersed phases are removed by collision with the wall. The particle sedimentation rate is available on the wall in the post-processing stage. Available post-processing variables for analysis in this model are:

 

  • Mass fraction
  • Volume fraction
  • Sedimentation rate
  • Slip velocity
  • Thrust velocity

One of the limitations of this model is that continuous and dispersed phases can’t be a combination of mixture variable themselves.

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