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April 4, 2020, 06:18 
Turbulent Heat Flux Extraction

#1 
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Oguzhan
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Hi all,
Hope everyone is well. Can anyone please guide me on extracting turbulent heat flux <u'T'> from kw SST and LES? Thanks. 

April 6, 2020, 07:09 
Turbulent Heat Flux

#2 
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Do you want this at a boundary or at interior faces of the mesh?
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April 6, 2020, 18:02 

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Oguzhan
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April 7, 2020, 16:42 
Turbulent Heat Flux

#4 
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For LES, this definition makes sense but has neither of these fields available. So, you have to define it either using k or subtract heat flux due to molecular diffusion from total to fetch turbulent heat flux.
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April 11, 2020, 12:37 

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Oguzhan
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Quote:
Many thanks 

April 11, 2020, 13:12 
Turbulent Heat Flux

#6 
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For RANS, you can determine u' using k,
Whether LES or RANS, turbulent heat flux is product of u' with mean T and not T'. Another method of determining turbulent heat flux in RANS is via and mean temperature gradient. You can use this for LES as well, however, for LES, you directly have u'. I am not sure but Fluent may directly have turbulent heat flux field available.
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April 12, 2020, 12:37 

#7 
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Oguzhan
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Quote:
Many thanks. 

April 12, 2020, 16:28 
Turbulent Heat Flux

#8 
Senior Member

You are correct, in similarity with Reynolds stress, turbulent heat flux uses temperature fluctuation and not it's mean. It's only if turbulent diffusivity is used that the gradient of mean makes sense for turbulent heat flux determination.
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Tags 
fluctuating temperature, fluctuating velocity, kwsst, les, turbulent heat flux 
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