Fluids

Fluids

I see plots for acoustic analysis reporting St instead of the frequency. Why they use that?

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    • prajput
      Ansys Employee
      I see plots for acoustic analysis reporting St instead of the frequency. Why they use that?  
    • Keyur Kanade
      Ansys Employee

      St is the Strouhal number. It represents a non-dimensional frequency and is defined as:

      St = fL/U

      where

      f is the frequency

      L is the characteristic length

      U is the characteristic velocity

      This number is typically used in acoustics to perform non-dimensional analyses and comparison.

    • Karthik R
      Administrator
      Essentially, experiments use often scaled models and because of that the emitted sound frequency are not the same as they would be in the real model. For this reason using the Strouhal number they can scale the frequency with the characteristic length and predict what would happen in the real size model.
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