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Fluent transient table time steps

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    • Mia Wan
      Subscriber

      Hi I'm currently learning Fluent for my cfd work and I with to simulate an oscillatory aerofoil with sinusoidal behaviours. Currently I wish to use a transient table to vary the boundary conditions to achieve this.

      I'd like to ask if time can be defined in this way in transient table? I have tried the case with a time step size of 1s and it worked. But if I reduced the time step size in the transient table into 0.1s, the cfd result did not seem to match. 

      Thank you 

    • Federico Alzamora Previtali
      Ansys Employee

      Hello, 

      yes you can input a varying time step size in Fluent. Regarding your results, I would expect that a time step of 0.1s will capture some transient effects that may not be resolved in a 1s time step - depending on the period of the oscillation for example.

      • Mia Wan
        Subscriber

        Hi, 

        Thank you for your reply! I'd also like to ask if I have a time step size of 0.02s for example, will it be better if I set the calculation time step size also as 0.02s, or a smaller time step size is better? 

        • Federico Alzamora Previtali
          Ansys Employee

          I am not sure I understand the difference between the time step you "have" and the time step you "set"? Can you clarify this?

          As a general rule, a smaller time step will provide better temporal resolution and accuracy but at the cost of computational time. Hence, you need to balance your choice of time step between those 2 things.

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