airwater or air

    Isothermal air-water two-phase simulation.

    • Group 1 - ICO2D
    • Group 2 - TREF, PREF
    Input Variable Format Description
    ICO2D integer
    Determines the type of air module used.
    ICO2D = 1, 1 degree of freedom solution to the saturated-unsaturated
    problem is produced. This formulation is similar to the Richard’s
    Equation.
    ICO2D = 2, 1 degree of freedom solution is obtained assuming only gas flow
    with no liquid present.
    ICO2D = 3, full 2 degree of freedom solution.
    All other values are ignored. The default is 3.
    TREF real Reference temperature for properties (oC).
    PREF real Reference pressure for properties (MPa).

    Several macros are affected if the air module is enabled. These are:

    • pres - Because the air-water formulation is 2-phase at all times, care should be taken to insure that IEOSD is always specified to be 2. Likewise, saturations (not temperatures) are used.
    • init - This macro should not be used because the saturation values cannot be specified.
    • flow - A variety of different flow and boundary values are input with this macro when the macro airwater is also used. See description of control statement flow.

    The following is an example of airwater. In this example, a full 2-degrees-of-freedom solution is specified with a reference temperature for property evaluation of 20 oC and a reference pressure of 0.1 MPa.

    airwater
    3  
    		0.1

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