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Results Evaluation
Figure: OpenFOAM tutorial car case. Velocity field in xy plane and stream lines
- Results can be watched in paraview by simply running paraFoam and populating the object pipeline by oneself.
- Alternatively, one can use a preset pvsm visualization template by typing
# paraFoam -touch
# paraview
and loading the template by File
Load state. - NOTE: The absolute path to the *.OpenFOAM placeholder in loaded “state” file may differ from current path to the *.OpenFOAM placeholder. If the path is different ParaView ask you for it via “Fix Paths in State File” window.
- Choose uField.pvsm or pField.pvsm.
Figure: OpenFOAM tutorial car case. Pressure field in xy plane and on a car body
- To obtain a better view of pressure field, set backface style in section Properties 17.4.
- The template motor.pvsm shows the flow field in engine compartment in
plane.
Figure: OpenFOAM tutorial car case. Stream lines in engine compartment
- To display the evolution of aerodynamic coefficients one can write a small script for gnuplot. 17.5 Run the script by typing gnuplot plotDragCoeffs.gp.
# Script for gnuplot
set xlabel "Iterations"
set ylabel "CdCoeff"
set grid
unset logscale y
set xrange [100:400]
set yrange [0.4:0.5]
plot "../carNoMotor/postProcessing/forces/0/forceCoeffs.dat" using 1:3 with line title 'Cd Car-M', \
"postProcessing/forces/0/forceCoeffs.dat" using 1:3 with line title 'Cd Car+M'
pause mouse
Figure: OpenFOAM tutorial car case. Drag coefficients comparison $ C_d$ on very coarse grid.
# Script for gnuplot
set xlabel "Iterations"
set ylabel "ClCoeff"
set grid
unset logscale y
set xrange [100:400]
set yrange [-0.4:-0.2]
plot "../carNoMotor/postProcessing/forces/0/forceCoeffs.dat" using 1:4 with line title 'Cl Car-M', \
"postProcessing/forces/0/forceCoeffs.dat" using 1:4 with line title 'Cl Car+M'
pause mouse 
Figure: OpenFOAM tutorial car case. Lift coefficients comparison $ C_l$ on very coarse grid.
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