OpenFOAM Cheatsheet

Fast post-processing

• create an empty file called foam.foam in the analysis folder
• open the latest Paraview on your machine and open the foam.foam; hit apply
• post-process

Running in parallel

• decide how many processor you want to use: $N$
• the dictionary decomposeParDict must be located in the folde system; use the method simple; the product of simpleCoeffs must give the number of processors
• type decomposePar in the terminal to decompose the mesh
• type mpirun -np N solver to run the analysis
• type reconstructPar in the terminal to put together the solution
• post-process

Plotting residuals

• type solver >output in the terminal to save all the output into a log file
• create a file called residuals in the analysis folder containing the following:

  set logscale y

  set title "Residuals"

  set ylabel 'Residual'

  set xlabel 'TimeStep'

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

  pause 1

  reread

• type gnuplot residuals in the terminal