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In Fluent, how to apply velocity input at specific time in a cell zone

    • raihan57

      I want to apply zero velocity for 5 seconds and after that, I want to apply constant velocity in a cell zone. Would you please help me how to write the expression or UDF for that? I want to use mesh motion. I would appreciate if you could help me how to write the UDF file or expression. 


      Thank you!

    • Federico Alzamora Previtali
      Ansys Employee

      You can use an expression for the velocity, such as 

      IF(t>=5[s],5 [m/s],0 [m/s])

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