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-   -   what length scale should be used when calculating kolmogorov scale of fountain flow? (https://www.cfd-online.com/Forums/main/187518-what-length-scale-should-used-when-calculating-kolmogorov-scale-fountain-flow.html)

John-Lee May 9, 2017 01:22

what length scale should be used when calculating kolmogorov scale of fountain flow?
 
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I want to use the LES and Laminar model in Fluent to simulate a fountain flow as shown in the attachment. So a fine mesh is needed. The Kolmogorov scale can be estimated by L (length scale) and Re (Reynolds number). My question is what is the length scale I should use when calculating Kolmogorov scale of the fountain flow?

FMDenaro May 9, 2017 03:16

Do you want to compare LES to a laminar (no-model) solution?

The Kolmogorov lenght scale depends on the physical viscosity and dissipation http://www.eng.utah.edu/~mcmurtry/Turbulence/turblt.pdf


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