CFD Online Discussion Forums - Plotting residuals at specified iterations

Hi all,

I've been working with the icoFsiElasticNonLinULSolidFoam-Solver and now I wish to plot some pressures and velocities with the foamLog feature.

Using this

Code:

#!/bin/sh



foamLog log.icoFsiElasticNonLinULSolidFoam >/dev/null



gnuplot -persist > /dev/null 2>&1 << EOF

    set logscale y

    set title "Residuals vs. Iteration"

    set xlabel "Iteration"

    set ylabel "Residuals"

    plot "logs/Ux_0" with lines

        "logs/p_o" with lines

EOF

I get
http://s22.postimg.org/wqwh0d6u9/residual.png
As you see, it plots the pressure and the velocity at each time step for every iteration. This is what I do not want. I would like to make gnuplot to only plot one iteration to get something like this. By the way, which iteration is the one where the pressure is finally calculated?
http://s13.postimg.org/eaqqixnpz/residual_aim.png
I've already read here http://www.cfd-online.com/Forums/ope...residuals.html about the opportunity of searching for keywords in the log-file - say Solving for p - and then only plot the 5th iteration for instance. This does not work for me because I, unfortunately, don't have the same number of iterations at every time step, see log.icoFsiElasticNonLinULSolidFoam below.

Code:

Starting time loop



Time = 1e-05



Selecting coupling scheme Aitken



Time = 1e-05, iteration: 1

Current fsi under-relaxation factor: 0.01

Maximal accumulated displacement of interface points: 0

Courant Number mean: 0 max: 0.010582011 velocity magnitude: 0.1

DILUPBiCG:  Solving for Ux, Initial residual = 0, Final residual = 0, No Iterations 0

DILUPBiCG:  Solving for Uy, Initial residual = 0, Final residual = 0, No Iterations 0

DILUPBiCG:  Solving for Uz, Initial residual = 1, Final residual = 1.6749469e-07, No Iterations 5

GAMG:  Solving for p, Initial residual = 1, Final residual = 7.8454256e-07, No Iterations 49

GAMG:  Solving for p, Initial residual = 0.00096438099, Final residual = 4.8412496e-07, No Iterations 14

GAMG:  Solving for p, Initial residual = 0.00031436632, Final residual = 7.4264579e-07, No Iterations 13

GAMG:  Solving for p, Initial residual = 0.00016755412, Final residual = 8.1207815e-07, No Iterations 8

GAMG:  Solving for p, Initial residual = 7.6243706e-05, Final residual = 4.5374849e-07, No Iterations 10

GAMG:  Solving for p, Initial residual = 4.0915507e-05, Final residual = 9.1485343e-07, No Iterations 5

time step continuity errors : sum local = 3.7404156e-08, global = -2.3675492e-09, cumulative = -2.3675492e-09

GAMG:  Solving for p, Initial residual = 0.0013683627, Final residual = 4.3307672e-07, No Iterations 22

GAMG:  Solving for p, Initial residual = 0.00032997883, Final residual = 4.5646898e-07, No Iterations 12

GAMG:  Solving for p, Initial residual = 0.00010911632, Final residual = 7.3822523e-07, No Iterations 11

GAMG:  Solving for p, Initial residual = 5.5182661e-05, Final residual = 4.2990674e-07, No Iterations 8

GAMG:  Solving for p, Initial residual = 2.3609087e-05, Final residual = 6.4197581e-07, No Iterations 6

GAMG:  Solving for p, Initial residual = 1.2722655e-05, Final residual = 8.1051448e-07, No Iterations 4

time step continuity errors : sum local = 2.2617868e-08, global = 1.3912904e-09, cumulative = -9.7625883e-10

GAMG:  Solving for p, Initial residual = 0.00034507198, Final residual = 5.9454111e-07, No Iterations 12

GAMG:  Solving for p, Initial residual = 1.2144121e-05, Final residual = 8.5821879e-07, No Iterations 3

GAMG:  Solving for p, Initial residual = 5.1700548e-06, Final residual = 6.9191494e-07, No Iterations 2

GAMG:  Solving for p, Initial residual = 2.3666948e-06, Final residual = 8.6874379e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 1.2543314e-06, Final residual = 4.9441931e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 8.8855956e-07, Final residual = 3.9211157e-07, No Iterations 1

time step continuity errors : sum local = 1.089435e-08, global = 7.3406188e-10, cumulative = -2.4219695e-10

GAMG:  Solving for p, Initial residual = 7.0069191e-05, Final residual = 9.3483475e-07, No Iterations 9

GAMG:  Solving for p, Initial residual = 3.1369736e-06, Final residual = 9.9856345e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 1.1743612e-06, Final residual = 6.750707e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 9.4203894e-07, Final residual = 5.486074e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 6.6430607e-07, Final residual = 3.5432881e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 4.2592467e-07, Final residual = 3.0642294e-07, No Iterations 1

time step continuity errors : sum local = 8.4933605e-09, global = -1.4727172e-10, cumulative = -3.8946867e-10

GAMG:  Solving for p, Initial residual = 2.9863857e-05, Final residual = 4.6478376e-07, No Iterations 10

GAMG:  Solving for p, Initial residual = 1.6085096e-06, Final residual = 6.7482957e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 8.553162e-07, Final residual = 7.378624e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 8.5041415e-07, Final residual = 2.6464988e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 2.7796804e-07, Final residual = 4.7745699e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 5.2013223e-07, Final residual = 1.573169e-07, No Iterations 1

time step continuity errors : sum local = 4.3550762e-09, global = 2.3448494e-10, cumulative = -1.5498373e-10

GAMG:  Solving for p, Initial residual = 1.5702477e-05, Final residual = 5.1452119e-07, No Iterations 8

GAMG:  Solving for p, Initial residual = 1.1479615e-06, Final residual = 6.8158643e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 8.1848843e-07, Final residual = 4.7892717e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 5.6060344e-07, Final residual = 2.6679135e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 2.8936236e-07, Final residual = 4.0404984e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 4.3162008e-07, Final residual = 1.3174023e-07, No Iterations 1

time step continuity errors : sum local = 3.6446532e-09, global = -5.673894e-11, cumulative = -2.1172267e-10

GAMG:  Solving for p, Initial residual = 8.9544569e-06, Final residual = 5.6335007e-07, No Iterations 6

GAMG:  Solving for p, Initial residual = 9.1572445e-07, Final residual = 6.4216219e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 7.4804658e-07, Final residual = 4.7696329e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 5.4568559e-07, Final residual = 2.211012e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 2.2934069e-07, Final residual = 3.6785184e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 3.8152844e-07, Final residual = 9.5832347e-08, No Iterations 1

time step continuity errors : sum local = 2.650164e-09, global = 4.6205192e-11, cumulative = -1.6551748e-10

GAMG:  Solving for p, Initial residual = 5.0816402e-06, Final residual = 6.1511579e-07, No Iterations 4

GAMG:  Solving for p, Initial residual = 8.5831001e-07, Final residual = 3.415422e-07, No Iterations 2

GAMG:  Solving for p, Initial residual = 4.394427e-07, Final residual = 3.3790318e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 3.7722589e-07, Final residual = 2.9273201e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 3.1918999e-07, Final residual = 1.3401569e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 1.3892653e-07, Final residual = 2.0453545e-07, No Iterations 1

time step continuity errors : sum local = 5.6550917e-09, global = 1.3113372e-11, cumulative = -1.5240411e-10

GAMG:  Solving for p, Initial residual = 3.1086862e-06, Final residual = 4.9145456e-07, No Iterations 3

GAMG:  Solving for p, Initial residual = 6.3227655e-07, Final residual = 9.3057068e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 9.7543941e-07, Final residual = 2.6790381e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 2.7234262e-07, Final residual = 4.4987925e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 4.723719e-07, Final residual = 1.459882e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 1.4744957e-07, Final residual = 9.940842e-08, No Iterations 1

time step continuity errors : sum local = 2.7481027e-09, global = 1.1015887e-10, cumulative = -4.2245237e-11

GAMG:  Solving for p, Initial residual = 1.7813092e-06, Final residual = 9.1939721e-07, No Iterations 2

GAMG:  Solving for p, Initial residual = 9.8743081e-07, Final residual = 3.8617628e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 4.1404525e-07, Final residual = 4.8046096e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 5.0063707e-07, Final residual = 1.4369455e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 1.4658958e-07, Final residual = 2.7075306e-07, No Iterations 1

GAMG:  Solving for p, Initial residual = 2.8271515e-07, Final residual = 8.9927077e-08, No Iterations 1

time step continuity errors : sum local = 2.4857938e-09, global = -2.270926e-10, cumulative = -2.6933784e-10

Setting traction on solid patch

Total traction force = (0.013880744 -0.013880747 2.6947141e-09)

Solving for DU, Initial residual = 1, Final residual = 9.9921645e-09, No outer iterations 5176

Current fsi residual norm: 1

I hope I was clear enough but is there any solution for my current problem?

Thanks in advance! :)