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OpenFOAM etc Directory

  • The etc directory contains environment setup files, global OpenFOAM® instructions, and default thermo data.

k varying with height or radius boundary condition

54 may be prescribed with any number of radial/axial intervals.

k:

 boundaryField
 {
".*_inlet"
    {
        type            turboFixedValue;
        value           $internalField;
        axis            ( 0 0 1 );
        h               ( 
                          -0.1
                           0.0
                           0.1   
                        );
        values          ( 
                            0.169777
                            0.0945885
                            0.163558
                        );

    }
 }

The inlet patch is virtually divided in to number of intervals. When parameter r or h is prescribed (with e.g. three height levels), the inlet patch is virtually divided into radial or axial intervals. Into each interval is prescribed corresponding value (linear interpolation is employed here).

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Physical boundaries

Each component has to be split into separate parts describing physical boundaries like inlet, outlet, walls, rotating walls, etc.

As a part of CFD process each part of the geometry has to be described with a special type of boundary conditions. Therefore, it is necessary to have an access to inlet and outlet boundaries for setting inlet and outlet boundary conditions and to physical walls to set wall boundary condition.

The physical walls should be split as well to distinguish which part is rotating and which part is fixed. Specifically, for a rotor component, one should split the boundary into hub, shroud and blade part which is useful for a specific turbomachinery evaluation. Additionally, blade can be split into leading edge, trailing edge, suction side and pressure side to define different refinement at these walls or for detailed pressure distribution evaluation and other postprocessing purposes.

An example of the splitting on a rotor component is visualized in Figure below.

components rotor patches

INPUT RULE 4: Each component has to be split into physical boundaries.