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How to set up detection points that follow the fluid motion？

- April 2, 2025 at 4:13 pm
  
  Tim T
  Subscriber
  
  I use S-ALE for solution calculation. I want to set up some monitoring points that move along with the fluid to monitor the fluid velocity. I would like to learn the specific steps for setting up these monitoring points.
- April 3, 2025 at 12:40 pm
  
  Alex R.
  Ansys Employee
  
  Hello Tim,
  You will need to define *DATABASE_TRACER_ALE. If a tracer is moving with the fluid the TRACK flag should be set to 0.
  
  From manual:
  Save a history of either a material point or a spatial point using tracer particles
  into an ASCII file: traleh. This history includes positions, velocities, and stress and other
  user-specified element history variables. The option *DATABASE_TRHIST must be active.
  This keyword is only to be used with ALE problems.
  
  Please let me know how it goes,
  
  Thank you,
  Alex

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