Density-weighted continuity equation

- August 6, 2023 at 9:15 pm
  
  Han Jirayuthanyawat
  Subscriber
  
  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)".
- August 14, 2023 at 10:59 am
  
  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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