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Working with the test case

Editing files, effective way

Test case directory contains the computational mesh and all configuration files with boundary conditions, initial conditions, constants of models, solver parameters, etc.

The test case structure is typically the same

An example of minimal configuration of test case directory:

outletVent boundary condition computes and prescribes special static pressure value at the outlet (goes locally, face by face). The formula for static pressure is following:

(2.1)

where is the reference static pressure, resistance is the resistance factor, is the density and is the velocity magnitude
p:

boundaryField
{
".*_outlet"
{
type outletVent;
resistance 0.0;
p0 uniform 100000.0;
relax 0.1;
pMax 150000.0;
value $internalField;
}
}

The physical meaning of outletVent boundary condition can be understood as a valve at the outlet that can be gradually opened and closed by increasing and decreasing the resistance factor. relax is relaxation factor of the static pressure to dump oscillations. pMax is maximum allowed value of the static pressure to dump oscillations .

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Speedlines

Every simulation consists of individual points with similar setup, which are grouped into speedlines sharing the rotation speed. Number of speedlines and number of points in every speedline is chosen in this section. Some other sections then adjust number of their inputs according to the numbers chosen here. The particular value of the rotation speed is set in “Reference frames” section.

The slider “Speedlines” sets the number of speedlines (groups of points with common rotation speed).

The sliders in “Speedline points” set the number of points in every speedline.

The entries in “Point iterations” set the number of iterations of steady-state calculation used for each of the points. This actually sets the maximal number of iterations. If “Convergence check” is enabled, the solver may terminate even before the iteration count reaches this number, if it decides that the efficiency and the fluxes are sufficiently converged.

The entries in “Transient times” set the time span of transient calculation used for each of the points. As in stationary calculation, if “Convergence check” is enabled, the solver may terminate even before the end of the requested time interval, if it decides that the efficiency and the fluxes are sufficiently converged.