Pressure Work
This subnode adds the following contribution to the right-hand side of the Heat Transfer in Fluids equation to model the result of heating under adiabatic compression as well as some thermoacoustic effects:
(6-10)
where αp is the coefficient of thermal expansion defined as:
The pressure work is computed using the relative pressure, and is generally small for low Mach number flows.
No settings are required.
When the Nonisothermal Flow multiphysics coupling node is added, the effect of pressure work can be taken into account by selecting the Include work done by pressure changes check box under the Flow Heating section. In this case, the Pressure Work feature is overridden by the multiphysics coupling node’s contribution.
Theory for Heat Transfer in Fluids
A similar term can be included to account for thermoelastic effects in solids. See Thermoelastic Damping.
Location in User Interface
Context menus
 Heat Transfer in Fluids>Fluid>Pressure Work
More locations are available. For example:
Heat Transfer in Solids>Fluid>Pressure Work
Heat Transfer in Moist Air>Moist Air>Pressure Work
Ribbon
Physics Tab with Fluid selected in the model tree:
Attributes>Pressure Work