# plot residuals in multiregion solver

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 April 4, 2012, 06:53 plot residuals in multiregion solver #1 Member   Join Date: Nov 2009 Location: Germany Posts: 96 Rep Power: 13 Hello, I would like to plot the residuals from a logfile with gnuplot. A nice tutorial for that can be found here. With single region solvers it works nice but not with multiregion solvers. As an example, here is a timestep of a tutorial case: Code: ```Time = 0.0469758 Solving for fluid region bottomAir diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0 DILUPBiCG: Solving for Ux, Initial residual = 0.05933919, Final residual = 1.875811e-09, No Iterations 2 DILUPBiCG: Solving for Uy, Initial residual = 0.07216778, Final residual = 2.727341e-09, No Iterations 2 DILUPBiCG: Solving for Uz, Initial residual = 0.06497582, Final residual = 2.468975e-09, No Iterations 2 DILUPBiCG: Solving for h, Initial residual = 0.1391416, Final residual = 5.374545e-08, No Iterations 2 Min/max T:300 319.7154 GAMG: Solving for p_rgh, Initial residual = 0.1779339, Final residual = 0.0008159564, No Iterations 3 diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0 time step continuity errors (bottomAir): sum local = 5.094676e-07, global = -1.166084e-10, cumulative = -1.841265e-07 GAMG: Solving for p_rgh, Initial residual = 0.008835792, Final residual = 2.173498e-07, No Iterations 1000 diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0 time step continuity errors (bottomAir): sum local = 1.498523e-10, global = -2.259186e-12, cumulative = -1.841288e-07 Solving for fluid region topAir diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0 DILUPBiCG: Solving for Ux, Initial residual = 0.08491977, Final residual = 4.188711e-09, No Iterations 4 DILUPBiCG: Solving for Uy, Initial residual = 0.1317485, Final residual = 9.808667e-08, No Iterations 4 DILUPBiCG: Solving for Uz, Initial residual = 0.094053, Final residual = 3.943191e-08, No Iterations 4 DILUPBiCG: Solving for h, Initial residual = 0.00873557, Final residual = 9.642108e-08, No Iterations 3 Min/max T:299.9996 300 GAMG: Solving for p_rgh, Initial residual = 0.03020841, Final residual = 0.0001659505, No Iterations 2 diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0 time step continuity errors (topAir): sum local = 3.574824e-07, global = -2.221026e-07, cumulative = 0.0002244136 GAMG: Solving for p_rgh, Initial residual = 0.003304726, Final residual = 8.552481e-08, No Iterations 13 diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0 time step continuity errors (topAir): sum local = 2.001775e-10, global = -5.684051e-11, cumulative = 0.0002244136 Solving for solid region heater DICPCG: Solving for T, Initial residual = 0.05991691, Final residual = 1.506036e-08, No Iterations 2 DICPCG: Solving for T, Initial residual = 2.892845e-06, Final residual = 8.470107e-10, No Iterations 1 Min/max T:min(T) [0 0 0 1 0 0 0] 300 max(T) [0 0 0 1 0 0 0] 500 Solving for solid region leftSolid DICPCG: Solving for T, Initial residual = 0.9645239, Final residual = 1.318008e-07, No Iterations 2 DICPCG: Solving for T, Initial residual = 1.649023e-05, Final residual = 5.392089e-09, No Iterations 1 Min/max T:min(T) [0 0 0 1 0 0 0] 300 max(T) [0 0 0 1 0 0 0] 300 Solving for solid region rightSolid DICPCG: Solving for T, Initial residual = 0.6954516, Final residual = 1.022314e-07, No Iterations 2 DICPCG: Solving for T, Initial residual = 1.153665e-05, Final residual = 3.904825e-09, No Iterations 1 Min/max T:min(T) [0 0 0 1 0 0 0] 300 max(T) [0 0 0 1 0 0 0] 300 ExecutionTime = 3.04 s ClockTime = 3 s``` I'm struckling to plot for example Tmax of the heater region. Any hint is appreciated. Best Regards, Toni __________________ "When I meet God, I am going to ask him two questions: Why relativity? And why turbulence? I really believe he will have an answer for the first." Werner Heisenberg

 September 5, 2012, 11:29 #2 New Member   Unnikrishnan Mohankumar Join Date: Apr 2011 Posts: 29 Rep Power: 11 Dear Tony. Did you find an answer. I now at this positions. I want to plot the temperature in each Region ( solid & Fluid ) But couldnt find a GNUplot code for including the next line.. Solving for solid region led_oben DICPCG: Solving for T, Initial residual = 1, Final residual = 0.04405201, No Iterations 2 Min/max T:406.8886 580.7125 Solving for solid region led_unten DICPCG: Solving for T, Initial residual = 1, Final residual = 0.04022057, No Iterations 2 Min/max T:407.0093 580.5514 Solving for solid region kuehlkoerper DICPCG: Solving for T, Initial residual = 1, Final residual = 0.01958096, No Iterations 2 Min/max T:300 439.3916 Thanks & Regards Unni Last edited by unnikrsn; September 5, 2012 at 11:29. Reason: improving

 September 6, 2012, 03:35 #3 Member   Join Date: Nov 2009 Location: Germany Posts: 96 Rep Power: 13 Hi, it won't work just with gnuplot. You need an additional script to extract the desired values before running gnuplot. It should look somehow like this: Code: ```grep 'Solving for T:' log.chtMultiRegionFoam >log_new2 awk '(NR+1)%3==0' log_new2 >log_new3``` Best Regards, Toni __________________ "When I meet God, I am going to ask him two questions: Why relativity? And why turbulence? I really believe he will have an answer for the first." Werner Heisenberg

 September 7, 2012, 03:59 #4 New Member   Unnikrishnan Mohankumar Join Date: Apr 2011 Posts: 29 Rep Power: 11 Thanks for the reply.. It was very helpful... Thanks & Regards Unni

 December 12, 2016, 07:06 #5 New Member   Mohamed el Abbassi Join Date: Oct 2016 Location: Delft, the Netherlands Posts: 8 Rep Power: 6 I tried the following simple adaptation to the tutorial and it worked nicely. The key is to use grep twice. First you output the number of lines after the line where the keyword is allocated with grep. Then you apply grep as in the tutorial. So something like plot "< cat logfile | grep -A2 specificRegion | grep 'Min/max T:' | cut -d' ' -f1 | tr -d ','" title 'T_specificRegion' with lines,\ where -A2 means that grep outputs 2 lines after the searched text (e.g bottomAir). For three lines, use -A3... etc... Cheers, Mohamed longamon and Lorg like this. Last edited by melabbassi; December 12, 2016 at 07:13. Reason: hyperlink to the tutorial added