To build divergence of volume fraction gradient in UDF

- December 8, 2019 at 8:13 am
  
  semi
  Subscriber
  
  Hi, I want to capture the curvature for water surface in Eulerian-Eulerian multi-phase flow simulation by UDF in fluent.
  
  The formula I want to implement is Div[grd(Vof-l)/mag(Vof-l))].
  
  I know that C_VOF_G(c,t) can calculate gradient of volume fraction
  NV_MAG(C_VOF_G(c,t)) can calculate magnitude of volume fraction.
  
  But how can I calculate divergence of volume fraction gradient in UDF.
- December 9, 2019 at 6:16 am
  
  DrAmine
  Ansys Employee
  
  You make a gradient of the gradient then sum the components of the matrix which result in the Laplacian.
- January 6, 2020 at 8:29 am
  
  semi
  Subscriber
  
  Thanks, abenhadj
  
  I got the idea.
  
  sorry for replying late.

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