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43 Instant convergence monitoring during computation

  • Convergence can be watched instantly using small script for Gnuplot

     

  • Suitable for immediate convergence watching

     

  • Create new file e.g. residuals:

     

    # Gnuplot script file for plotting data from file "log"
set title "Convergence process"
set xlabel "Iterations"
set ylabel "Reziduals"
set logscale y
plot "< cat log.simpleFoam | grep Ux | cut -d' ' -f9 | tr -d ','" title 'u', \
     "< cat log.simpleFoam | grep Uy | cut -d' ' -f9 | tr -d ','" title 'v', \
     "< cat log.simpleFoam | grep Uz | cut -d' ' -f9 | tr -d ','" title 'w' 
pause 10 # pause mouse

     

  • Anytime during computation it can be run by typing command:
    # gnuplot residuals
openfoam tutorial motor bike residuals

Figure: OpenFOAM tutorial motor bike. Velocity residuals during computation.

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