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Calculation of the turbulent kinetic energy

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Old   March 18, 2016, 05:02
Default Calculation of the turbulent kinetic energy
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Petya Stoyanova
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When computing the turbulent kinetic energy (and other related quantities) should I include the velocities on the boundaries when Navier slip boundary condition is applied?

Navier boundary condition:

Us = ls (dUs/dy)wall

Us is the slip velocity, ls - the slip length (parameter), and
(dUs/dy)wall is the velocity gradient at the wall.

Also how should I do it if my mesh is non-uniform in one direction?
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Old   March 21, 2016, 01:11
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tke applies only to the fluid.
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Old   March 22, 2016, 02:22
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Petya Stoyanova
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Yes, but under slip condition isn't the velocity of the fluid at the boundary different than the velocity of the wall? My question is in that case shouldn't it be included in the calculation of the turbulent kinetic energy?

And also I'm bit at a loss when it comes to the mathematical expression of the turbulent kinetic energy in the code itself as the mesh is non-uniform and all the other velocities are calculated in the cell centers. Only the velocities at the boundaries are calculated on the cell faces.
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