When using the pressure-based solver, a Shock Wave Identification
Parameter field variable is available in the Derivatives...
category. This parameter can be useful for aerodynamic simulations, as you can determine the
location of shock waves through postprocessing and/or use it to create cell registers for mesh
adaption. This parameter is represented by 
in the following equation:
 | (20–1) |
where
 | (20–2) |
and
 is the speed of sound for the fluid | |
 is the gradient of fluid pressure | |
 is the fluid velocity | |
 is the exponential filter constant | |
 is the linear noise reduction constant |
The Shock Wave Identification Parameter field variable is only available when all of the following are true:
beta features are enabled (as described in Introduction)
the pressure-based solver is selected
the energy equation is enabled
the case is initialized
When the Shock Wave Identification Parameter field variable is available, you can also use the following field variables:
Shock Wave Identification Parameter (Limited)
This represents a version of
in which numerical limiting is imposed on the pressure gradient in Equation 20–2 for overshoots.Shock Wave Identification Parameter (Non-Limited)
By default this is identical to Shock Wave Identification Parameter.