Derivation of boundary condition for turbulent dissipation
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The first formula is the so-called equilibrium law. It is not an exact result but one worth knowing. There was a somewhat recent discussion in Annual Revs. Fluid Mechanics. People often use this formula to calculate a reasonable value for epsilon to be applied as an inlet boundary condition. For super accurate simulations, you have to get the real value of epsilon via even more accurate simulation or measure it directly.
The second formula is the k-epsilon turbulence model itself. |
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