The dissipation term of the turbulent kinetic energy (see Section
12.5.1)
is modified for the DES turbulence model as described in Menter's work [
238] such that
(12.86)
where
is no longer a constant equal to 1 as in the SST

model (see Section
12.5.1), but is now expressed as
(12.87)
where
is a calibration constant used in the DES model and has a value of 0.61,
is the maximum local grid spacing (
) and
is defined in Equation
12.516.
The turbulent length scale is the parameter that defines this RANS model: