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Multi-Region Approach

In general, this methodology allows working with any number of regions. This computational model consists of three parts (regions). We consider following regions:

  • rotor is rotational part of the model, fluid is flowing over rotating turbine wheel
  • 2 stators are static parts of the model, fluid is flowing through
    • spiral
    • drafttube

[spiral (stator)]

kaplan turbine cfd openfoam mesh spiral

[rotor]

kaplan turbine cfd openfoam mesh rotor

[drafttube (stator)]

kaplan turbine cfd openfoam blockmesh drafttube

Figure: Three regions of the computational model of Kaplan water turbine: spiral; rotor; drafttube;

During simulation, each region is computed individually and each region communicates with other regions through special boundary conditions.

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