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- Convergence can be watched instantly using small script for Gnuplot
- Suitable for immediate convergence watching
- Create new bash script e.g. writeResiduals.sh:
#!/bin/sh cat log.simpleFoam | grep Ux | cut -d' ' -f9 | tr -d ',' > residualsUx.dat cat log.simpleFoam | grep Uy | cut -d' ' -f9 | tr -d ',' > residualsUy.dat cat log.simpleFoam | grep Uz | cut -d' ' -f9 | tr -d ',' > residualsUz.dat
- Cygwin therefore OpenFOAM for Windows supports only files in Unix format (i.e. with \n for newlines as opposed to the DOS/Windows \r \n newline). If there is a problem with running script writeResiduals.sh add following line into your script just after the #! line
(set -o igncr) 2>/dev/null && set -o igncr; # this comment is required
- Create new file e.g. residuals.gp:
# Gnuplot script file for plotting data from file "log" set title "Convergence process" set xlabel "Iterations" set ylabel "Reziduals" set logscale y plot 'residualsUx.dat' title 'u', \ 'residualsUy.dat' title 'v', \ 'residualsUz.dat' title 'w' pause mouse
- Run writeResiduals.sh, which creates data files with residuals
# bash writeResiduals.sh
- Run residuals.gp, by opening the script file in gnuplot program
Figure: OpenFOAM tutorial motor bike. Velocity residuals during computation.