Writting an expression

- May 23, 2022 at 12:15 pm
  
  Amirr
  Subscriber
  
  Hello everyone I am using VOF model in Ansys FLUENT and going to calculate the droplet speed in every time step and monitor that.
  I wrote this expression but it doesn't get a reasonable result, I wonder if somebody helps me about that
  Average(IF(Volumefraction(phase='droplet')>0.99, Position.x, 0 [m]), ['fluid'], Weight='Mass')
  Thank you in advance.
- May 23, 2022 at 2:22 pm
  
  DrAmine
  Ansys Employee
  
  Your expression does not mass-weighed-average the speed but rather the position.
- May 23, 2022 at 2:32 pm
  
  Amirr
  Subscriber
  
  thank you so much. so what is the correct version?
  yes, here first I just want to know the x-location of droplet
  then using the below one I am going to find the droplet velocity
  Average(IF(Volumefraction(phase='droplet')>0.99, velocity.x, 0 [m]), ['fluid'], Weight='Mass')
  but they are not worked
- May 23, 2022 at 4:08 pm
  
  DrAmine
  Ansys Employee
  
  Use report definition directly without any expressions.
  Your formula looks okay so I cannot judge your results. What do you want to do?
- May 23, 2022 at 4:56 pm
  
  Amirr
  Subscriber
  
  I need the droplet phase speed, location (x, y, separately), how can I get that and monitor them as the simulation runs?
- May 23, 2022 at 7:19 pm
  
  DrAmine
  Ansys Employee
  
  Create report definitions then allow for writing them into file. You can moreover monitor them during the run.

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