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Literature on Calculating the resolved and unresolved TKE |
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March 14, 2021, 04:42 |
Literature on Calculating the resolved and unresolved TKE
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#1 |
New Member
Fab
Join Date: Nov 2020
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Hey Guys,
I found in this forum a link to the Ansys CFX Support Forum, in which a definition for the resolved and unresolved Turbulent Kinetic Energy is found: https://forum.ansys.com/discussion/2...kinetic-energy Im interested in this calculation, but i cant find any literature to support this definition of the TKE. Does someone know a good source? |
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March 15, 2021, 03:21 |
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#2 |
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Glenn Horrocks
Join Date: Mar 2009
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The reference I use for most turbulence calculations is "Turbulence Modelling for CFD" by Wilcox.
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Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum. |
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March 16, 2021, 04:57 |
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#3 |
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Fab
Join Date: Nov 2020
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I have taken a look, but there i only find the resolved TKE formulation, like i most of the time do when im searching for this topic. LES ist listed in this book under "New Horizons", I think its to old to have information of the energy of the unresolved part? Do you know another literature regarding this topic?
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March 16, 2021, 06:07 |
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#4 |
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Glenn Horrocks
Join Date: Mar 2009
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If you don't like my reference then you can find your own. Doing a literature study is an important skill for a researcher, so it is time to get some practise.
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Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum. |
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March 17, 2021, 06:34 |
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#5 |
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Fab
Join Date: Nov 2020
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I really dont have anything against your literature, in fact im referencing myself often this literature. I just think it doenst provide any answer to the above mentioned question, or am getting something wrong here? This might be the case!
Im really having trouble to understand the formulation in the forum post. I think its just a modification of the eddy viscosity in the smagorinsky model: v_t=(C_s*(dxdydz)^(1/3))^2*|bar(S)|. But I really dont find any literature, giving a context between |bar(S)| and (1/3)*ShearStrainRate ? |
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March 17, 2021, 07:33 |
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#6 |
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Would you mind sharing how you would compute the turbulent kinetic energy for the Smagorinsky LES model regardless of CFD software being used?
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Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum. |
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March 19, 2021, 15:59 |
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#7 |
New Member
Fab
Join Date: Nov 2020
Posts: 25
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I found two sources which helped me to figure it out.
In "Nonequilibrium energy spectrum in the subgrid-scale one-equation model in large-eddy simulation" by Horiuti and "Sub-grid Scale Modeling in Large Eddy Simulation with Variable Eddy-Viscosity Coefficient" are in my opionen two very good derivations. But I still dont get the 1/0.3 pre-factor in the equation from the official ansys forum |
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