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Previous: Copying Tutorial Up: Test case: Cavity Next: Working with files

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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:
nameOfTheTestCaseTest case directory
img92 1 1 systemSolver parameters
     img92 1 1 controlDictComputation options
     img92 1 1 fvSchemesNumerical schemes options
     img92 1 1 fvSolutionLinear solver options
img92 1 1 constantConstant data (physics)
     img92 1 1 polyMeshMesh directory
     img92 1 1 transportPropertiesFluid properties
     img92 1 1 turbulencePropertiesTurbulence properties
img92 1 1 0Directories with time layers (results)

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

outletVent Boundary Condition

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:
$\displaystyle \color{white} p_{s_{out}}^{eachFace} = p_{0} + resistance \cdot \frac{1}{2} \rho \cdot \Vert U \Vert^2$ (2.1)
where $ \color{white} p_{0}$ is the reference static pressure, resistance is the resistance factor, $ \color{white} \rho$ is the density and $ \color{white} U$ 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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Previous: Components Up: TCFD – GUI Setup Next: Turbulence
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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.
cfd processor TCFDSource speedline settings

Figure: Plugin TCFDSource – speedline settings.

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Previous: Components Up: TCFD – GUI Setup Next: Turbulence

OpenFOAM Training by CFD Support,   CFD SUPPORT,   info@cfdsupport.com    +420 212 243 883      © CFD support, s.r.o., Sokolovská 270/201, 190 00 Praha 9, Czech Republic