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Energy equation - where is the turbulent kinetic energy? |
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June 24, 2016, 12:04 |
Energy equation - where is the turbulent kinetic energy?
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#1 |
Senior Member
Join Date: Sep 2015
Location: Singapore
Posts: 102
Rep Power: 11 |
Greetings everyone,
In the derivation of the Favre-averaged energy equation, the total energy comprises of the internal energy, mean kinetic energy and turbulent kinetic energy: (See Chapter 5.3 of Turbulence Modelling for CFD by Wilcox for derivation) But the compressible flow solvers do not include the turbulent kinetic energy term (k) in the energy equation. Similarly, a few terms on the RHS of the energy equation are also missing. Does any know why this is the case? Thanks for all the help! |
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January 25, 2022, 15:04 |
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#2 |
New Member
Join Date: Jan 2017
Posts: 22
Rep Power: 9 |
Hi!
Old topic, but maybe this still helps somebody. With respect to the doubt, the link below comments a little about the terms being neglected. https://openfoamwiki.net/index.php/RhoSimpleFoam If I understood correctly, the reason "is to have the same equation whether one solves for e or h". I don't know about when this simplifications are OK and when they can cause problems, but I would guess that they may be acceptable for the flow regimes rhoSimpleFoam is intended to solve. Also, it is not hard to modify the code and test it. Hope this helps. |
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