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inletOutlet Boundary Condition

The inletOutlet boundary condition is normally the same as zeroGradient, but it switches to fixedValue if the velocity vector next to the boundary aims inside the domain (backward flow). The value of that fixedValue is inletValue. See figure (crossref).

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Figure: The meaning of inletOutlet boundary condition

U:

 boundaryField
 {
 ".*_outlet"
    {
        type            inletOutlet;
        value           $internalField;
        inletValue      uniform (0 0 0);
    }
 }



k, omega, epsilon, T:

 boundaryField
 {
 ".*_outlet"
    {
        type            inletOutlet;
        value           $internalField;
        inletValue      uniform 0;
    }
 }

Pump Efficiency

The pump efficiency can be evaluated using following efficiency formula:

43(6.3)

where 36 denotes the efficiency, 37 is the torque, 40 is the angular velocity, 38 is the volume flow rate and 39 is the specific enthalpy which can be evaluated as follows:

44(6.4)

Subscript 42in means averaged quantities at the inlet, whereas subscript 42out denotes averaged quantities at the outlet. The evaluation of pump efficiency for different patches is also possible.

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Cavitation Modeling in TCFD

TCFD in its current form has three models for handling the cavitation:

  • Cavitation risk provides a “warning”, when pressure drops too low and thus cavitation inception is likely.
  • Cavitation index is standard measure of cavitation.
  • Multiphase cavitation modeling using Schnerr-Sauer model .

Subsections