## 12.8.3 SST - RANS Model

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

 (12.8-6)

where is no longer a constant equal to 1 as in the SST - model (see Section  12.5.1), but is now expressed as
 (12.8-7)

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  12.5-16.

The turbulent length scale is the parameter that defines this RANS model:
 (12.8-8)

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