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-   -   plot residuals in multiregion solver (http://www.cfd-online.com/Forums/openfoam/99472-plot-residuals-multiregion-solver.html)

val46 April 4, 2012 05:53

plot residuals in multiregion solver
 
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

unnikrsn September 5, 2012 10:29

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

val46 September 6, 2012 02:35

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

unnikrsn September 7, 2012 02:59

Thanks for the reply.. It was very helpful...

Thanks & Regards
Unni


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