Adjust coefficients in models supplied by Fluent(Drag force, Lift force…)

- August 21, 2017 at 1:28 pm
  
  cong
  Subscriber
  
  Hi. I tried to analysis the sensitivity of boiling related parameters on the subcooled boiling flow. During this, I tried to tune the coefficients of models, such as the drag force coefficient. However, I found the drag force coefficient, such as the coefficients used in the Grace model (coefficient in Eqs 17-195 to 200 in Fluent Theory Guide V 18.1), can not be adjusted by GUI or Scheme. Is there any way to adjust these coefficients? Do I need to write a UDF to replace the Grace model in Fluent so I can adjust the coefficient in my own function? Thanks.
  
  Following are models I would like to study but still have not found a way to adjust them by using GUI or Scheme.
  
  Drag force: Grace
  
  Lift force: Moraga
  
  Heat transfer: Ranz-Marshall
  
  Bubble departure frequency: Cole
  
  Area influence coefficient: Delvalle-Kenning
  
  Secondary phase diameter: boiling-dia

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