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Density-weighted continuity equation

    • Han Jirayuthanyawat
      Hi everyone,
      I was just wondering what it meant by density-weighted continuity equation? I'm not so sure if it applies for multiphase flow of two fluids in CFX. Does CFX impliment this in their equation? If not, how do I do that? Thank you so much.
      The full text from the paper: " we solve for six momentum equations, together with mass conservation and an equation for the phase fraction which involves the difference of the density-weighted continuity equations (leading to a constraint for continuity that ensures conservation of mass even in the early, not fully converged, stages of the computation)". 
    • CFD_Friend
      Ansys Employee

      Hi Han,

      The density-weighted continuity equation is a concept used in fluid dynamics to account for the variation in density of a fluid when considering mass conservation. In CFX, two distinct multiphase flow models are available, an Eulerian-Eulerian multiphase model and a Lagrangian Particle Tracking multiphase model. 

      More about this can be found here:

      Chapter 7: Multiphase Flow Modeling

      Chapter 5: Multiphase Flow Theory


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