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Old   May 26, 2015, 09:07
Default Turbulence Calculation
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Hello,

at the inlet there is the turbulent inlet boundary condition.

Now I like to calculate/measure the intensity at L/4, L/2, 3L/4 and L (L = length of the pipe).

Could you give me a tip?

Thank you!
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Old   May 27, 2015, 06:41
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Nicole Andrew
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Hi Simon,

Do you know what equation you would like to use to calculate the turbulence intensity? I remember looking for it a while back but I could not figure out exactly what OpenFOAM uses. I am by no means a turbulence expert, but if you have an equation for it then I might be able to help you implement that in OpenFOAM. Have you looked at the sample utility? I have not used it myself yet.

Regards,
Nicole
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Old   May 30, 2015, 12:36
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Andrea Bianco
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Hello,
it really depends on what kind of turbulence modelling you are using. If you are using rans equations then you can choose different turbulence models, as k-eps, k-omega, etc. If you have k available in your turb model then you can calculate turb intensity by deriving if from k value, because k is turbulence kinetic energy and it's directly linkend to turb intensity.
You can sample the k value where you want using the "sample" utility with a sampleDict.
If otherwise you are doing Les, you have turb components of velocities, therefore you can directly calculate turb intensity.

Best
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