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Physics

  • Let us assume a two-dimensional flow in a cavity. Test case geometry is following:
openfoam cavity tutorial sketch test case

Figure: Test case geometry

  • The fluid flow has following parameters:
    • Top wall velocity: U = 1 m/s
    • Cavity edge length: d = 10 cm
    • Laminar, Re = 10
    • Incompressible
    • Isothermal flow
    • Unsteady flow

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Next: Input parameters Up: turbo-blade-post-user-manual Previous: Kaplan Turbine Tutorial, blade   Contents   Index

Meridional Average filter

The filter Meridional Average creates a geometrical slice by a plane containing the rotation axis and circularly averages all the field data onto this slice. The slice ignores blades (there are never holes in the slice).

Subsections

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Next: fixedMeanValue Static Pressure Boundary Up: Fixed Static Pressure Family Previous: Fixed Static Pressure Family   Contents   Index

fixedValue Static Pressure Boundary Condition

fixedValue boundary condition simply prescribe fixed value for the quantity. Fixed value can be uniform or nonuniform.

p:

 boundaryField
 {
 ".*_outlet"
    {
        type            fixedValue;
        value           uniform 0;
    }
 }

 

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Reference frames

This Section describes a general setup for multi-rotor simulations.

Each frame holds information about axis of rotation and revolution speed. Each frame can be defined either as rotating or stationary.These frames are afterwards used in `Components” section for setting rotation of individual components or boundary parts of the geometry.

The “Reference frames” section is depicted in Figure crossref 3.

cfd processor TCFDSource referenceFrames

Figure: Plugin TCFDSource – Reference frames setup.

The number of reference frames is controlled by the slider (or edit field) “Number of reference frames”. When the number of components changes, the number of panels in this section is adjusted accordingly. Every frame holds following parameters:

  • “Name” defines user-defined name of the reference frame.
  • “Axis” defines the components of the rotation axis direction vector.
  • “Origin” defined the coordinates of the rotation axis origin.
  • “Rotating” check if this reference frame defines the physical rotation
  • The entries in “Rotation speed” set the rotation speed of the frame for every speedline, either in radians per second or in full revolutions per minute (RPM). The unit is chosen in the drop-down box to the right. The number should be positive when the vector of the angular velocity points in the same direction as the rotation axis (right-hand rule) and negative when it points into the opposite direction. The number of speedlines is set in “Speedlines” section.
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