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), and in the Default Model Inputs node under Global Definitions, set a value for the Volume reference temperature in the Expression for remaining selection section.
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This model input does not override the Reference temperature Tref set in the Physical Model section of the physics interface, which is used to evaluate the reference enthalpy, and a reference density for incompressible nonisothermal flows.
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). The available options are User defined (default), Common model input (the minput.T variable, set to 293.15 K by default) and all temperature variables from the physics interfaces included in the model. To edit the minput.T variable, click the Go to Source button (
), and in the Default Model Inputs node under Global Definitions, set a value for the Temperature in the Expression for remaining selection section.
), and in the Default Model Inputs node under Global Definitions, set a value for the Pressure in the Expression for remaining selection section. When additional physics interfaces are added to the model, the absolute pressure variables defined by these physics interfaces can also be selected from the list. For example, if a Laminar Flow interface is added, you can select Absolute pressure (spf) from the list. The last option is User defined.
), and in the Default Model Inputs node under Global Definitions, set values for the Velocity components in the Expression for remaining selection section.
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αp is the coefficient of thermal expansion (SI unit: 1/K):
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χt is the isothermal compressibility (SI unit: 1/Pa):
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The gas constant, with two options for the Gas constant type: Specific gas constant Rs or Mean molar mass Mn. If Mean molar mass is selected, the software uses the universal gas constant R = 8.314 J/(mol·K), which is a built-in physical constant, to calculate the specific gas constant.
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Either the Heat capacity at constant pressure Cp,f or the Ratio of specific heats γ by selecting the option in the Specify Cp or γ list. For an ideal gas, it is sufficient to specify either Cp,f or the ratio of specific heats, γ, because these properties are interdependent.
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Vapor mass fraction to define the ratio between vapor mass and total mass.
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Concentration to define the amount of water vapor in the total volume. If this option is selected, a Concentration model input is automatically added to the Model Inputs section.
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Moisture content (default, also called mixing ratio or humidity ratio) to define the ratio between the mass of water vapor and the mass of dry air.
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Relative humidity ϕw, a quantity defined between 0 and 1, where 0 corresponds to dry air and 1 to air saturated with water vapor. The Relative humidity, temperature condition
 and Relative humidity, absolute pressure condition  should be specified. |
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When the Porous Medium type is set to Local thermal nonequilibrium in the Porous Medium parent node, the Initial Values, Heat Source, Thermal Insulation, Symmetry (Heat Transfer Interface), Temperature, Heat Flux, Lumped System Connector, Phase Change Interface, Continuity, Inflow, Outflow, Open Boundary, Boundary Heat Source, Surface-to-Ambient Radiation (Heat Transfer Interface), and Deposited Beam Power features are available under the Fluid subnode.These subnodes allow the definition of domain and boundary conditions specific to the fluid phase temperature Tf.
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