# 7.17.1.21.50. Pressure_Material_Derivative

Syntax

  Source For Energy ([{of} SpeciesName] | [{in} MaterialPhaseName] | [{ls} {a | b | c}]) {@ | at | for | on | over} MeshPartIdentifier = Pressure_Material_Derivative ([Power_Output = power_output] | [Toggle = toggle] | [Multiplier = multiplier])

Summary

  Pressure material derivative source for energy equation

Description

  The following options are present in most boundary conditions/sources. The meaning of each option is as follows:

  Power_Output

    If specified, the total (integrated) power of the given BC/Src is calculated and stored into the global variable name specified as the power_output argument.

  Toggle

    If given, specifies which toggle block controls whether this BC is active or not.

Parameter | Value | Default
--- | --- | ---
{of} | {of | species | subindex} | –
SpeciesName | string | –
{in} | {in | material_phase} | –
MaterialPhaseName | string | –
{ls} | {levelset_phase | ls} | –
MeshPartIdentifier | string | –
power_output | “string” | –
toggle | “string” | –
multiplier | real | 1