set logscale y
set title "Residuals"
set ylabel 'Residual'
set xlabel 'Iteration'

set terminal pngcairo size 800,600
set output 'residuals_plot.png'

plot "< cat log.simpleFoam | grep 'Solving for Ux' | cut -d' ' -f9 | tr -d ','" title 'Ux' with lines,\
"< cat log.simpleFoam | grep 'Solving for Uy' | cut -d' ' -f9 | tr -d ','" title 'Uy' with lines,\
"< cat log.simpleFoam | grep 'Solving for Uz' | cut -d' ' -f9 | tr -d ','" title 'Uz' with lines

set output