This RANS model is similar to the Realizable

model discussed in Section
12.4.3, with the exception of the dissipation term in the
equation. In the DES model, the Realizable

RANS dissipation term is modified such that:
(12.82)
where
(12.83)
(12.84)
(12.85)
where
is a calibration constant used in the DES model and has a value of 0.61 and
is the maximum local grid spacing (
).
For the case where
, you will obtain an expression for the dissipation
of the
formulation for the Realizable

model (Section
12.4.3):