The second term in the kinetic energy equationis the production of turbulent kinetic energy.
With the symmetry assumption at the mid-plane of the test cell it becomes:
![](images/image197.png)
The third term indicates diffusion; under the assumption . It can be expressed as:
![](images/image199.png)
The fourth term is viscous dissipation. If local isotropy in velocity fluctuations is
assumed, we get
![](images/image200.png)
Dissipation can also be calculated based on the assumption of locally axisymmetric turbulence and is equal to
![](images/image201.png)
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