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Inlet Boundary Conditions

  • At the inlet of the model there is a number of boundary conditions that can be prescribed. Depending on the machine type, data available and many more. There is always a set of boundary conditions for velocity and pressure at the same time. Turbulent quantities as e.g. kinetic energy of turbulence $ k$, or e.g. rate of dissipation of kinetic energy of turbulence $ \epsilon$ they have more simple approach and are not dependent on the choice of velocity and pressure boundary conditions.

    NOTE: Inlet boundary conditions are usually supported by boundary type patch, defined in the mesh file boundary.

Subsections

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Temporal Fields Averaging - fieldAverage Function

Function fieldAverage is included in file controlDict and it is a part of libfieldFunctionObjects.so library. Definition of these functions are created in file fieldAvg.fun. This function samples temporal average of fields $ \color{white} U$ and $ \color{white} p$ over a fixed time interval given by window parameter. Averaging function for rotor region is listed below: 
    fieldAverageRotor
    {
        // Type of functionObject
        type            fieldAverage;

        // Where to load it from (if not already in solver)
        functionObjectLibs ("libfieldFunctionObjects.so");

        // Function object enabled flag
        enabled         true;

        // When to output the average fields
        outputControl   outputTime;

        // Region option
        region rotor;
    
        // Reset on output
        resetOnOutput true;

        // Fields to be averaged - runTime modifiable
        fields
        (
            U
            {
                mean        on;
                prime2Mean  off;
                base        time;
                window      100; // optional averaging window
            }

            p
            {
                mean        on;
                prime2Mean  off;
                base        time;
                window      100; // optional averaging window
            }
            
            p_rgh
            {
                mean        on;
                prime2Mean  off;
                base        time;
                window      100; // optional averaging window
            }
        );
    }

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