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How to obtain the SGS turbulent kinetic energy in LES model |
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#1 |
New Member
gen pei
Join Date: Aug 2019
Posts: 10
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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. Regards, Gen Pei |
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#2 |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,728
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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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#3 |
New Member
TheIndianLel
Join Date: Mar 2019
Location: Germany
Posts: 25
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You can activate aeroacoustics model(even if you are not going to use it) to get the in-built SGS Turbulent Kinetic Energy variable.
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les;sgs |
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