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How to obtain the SGS turbulent kinetic energy in LES model

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Old   June 3, 2020, 21:11
Default How to obtain the SGS turbulent kinetic energy in LES model
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gen pei
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Dear Experts,

I am using the LES model to simulate the room airflow on StarCCM+. I would like to compare the contour of total turbulent kinetic energy to the RANS model.

I am aware that the total turbulent kinetic energy of LES has resolved and SGS parts. Now I can calculate the resolved part using field variance (thanks to this forum). But I still don't know how to obtain the SGS turbulent kinetic energy (after searching the forum).

I used the WALE SGS model and seems there is no built-in function for this. I tried to create the new field function but I had difficulty defining this value. The equations in guidebook shows the SGS Tke is the function of strain rate tensor. I have no clue how to define it as field function.

Please let me know if you have any advice. Thank you.

Gen Pei
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Old   June 4, 2020, 06:17
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Lucky Tran
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If you enable temporary storage retained then the modulus of the strain rate tensor will be available as a field function which is all you need.

The strain rate tensor, being a tensor, is somewhat tricky to define using only vector field functions.
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