Pressure Work
This subnode adds the following contribution to the right-hand side of the heat transfer equation to model the result of heating under adiabatic compression as well as some thermoacoustic effects:
(6-13)
where
α
p
is the coefficient of thermal expansion defined as:
The pressure work is calculated 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 is automatically taken into account. 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 take into account thermoelastic effects in solids. See
Thermoelastic Damping
.
Location in User Interface
Context Menus
Heat Transfer in Fluids>Fluid>Pressure Work
Heat Transfer in Moist Air>Moist Air>Pressure Work
Heat Transfer in Porous Media>Porous Medium>Fluid>Pressure Work
Ribbon
Physics tab with
Fluid
or
Porous Medium>Fluid
selected in the model tree:
Attributes>Pressure Work
