[sandrobrad]

Hi everyone,
I would like to know if there is a way to get all the deltaT and Time Values and write it in columns inside a file. I know that the foamLog tool does it but that does not provide that certain values.

I've tried the followind command

grep -n 'deltaT = ' log.orig > log.delta

in the following log

Courant Number mean: 0.002301022713 max: 0.05578931023
deltaT = 1.199040767e-05
Time = 1.19904e-05

PIMPLE: Iteration 1
smoothSolver:  Solving for Ux, Initial residual = 0.9999999898, Final residual = 0.004609686912, No Iterations 1
smoothSolver:  Solving for Uz, Initial residual = 0.9999999885, Final residual = 0.004594001409, No Iterations 1
GAMG:  Solving for p, Initial residual = 1, Final residual = 0.007652692688, No Iterations 8
time step continuity errors : sum local = 1.458725802e-08, global = 2.382430583e-09, cumulative = 2.382430583e-09
GAMG:  Solving for p, Initial residual = 0.5096147552, Final residual = 8.985245077e-08, No Iterations 34
time step continuity errors : sum local = 2.705657257e-13, global = 6.257742803e-14, cumulative = 2.382493161e-09
PIMPLE: Iteration 2
smoothSolver:  Solving for Ux, Initial residual = 0.1138942546, Final residual = 0.0003334726579, No Iterations 1
smoothSolver:  Solving for Uz, Initial residual = 0.1186037818, Final residual = 0.0004058030468, No Iterations 1
GAMG:  Solving for p, Initial residual = 0.2334599784, Final residual = 0.001869522242, No Iterations 7
time step continuity errors : sum local = 1.103546731e-08, global = -8.185891426e-10, cumulative = 1.563904018e-09
GAMG:  Solving for p, Initial residual = 0.1528364148, Final residual = 5.283523199e-08, No Iterations 31
time step continuity errors : sum local = 3.077853457e-13, global = -7.28369012e-14, cumulative = 1.563831181e-09
forces forcesIncompressible write:
    sum of forces:
        pressure : (10464.36616 7.252435353e-14 220299.4662)
        viscous  : (0.08075981986 -1.419327402e-19 0.01956819158)
        porous   : (0 0 0)
    sum of moments:
        pressure : (-1.289929731e-15 -57665.86044 5.434377084e-14)
        viscous  : (5.458984645e-21 -0.002230887901 -1.752967528e-19)
        porous   : (0 0 0)

Courant Number mean: 0.002748514158 max: 0.1086504914
deltaT = 1.437123682e-05
Time = 2.63616e-05

PIMPLE: Iteration 1
smoothSolver:  Solving for Ux, Initial residual = 0.284301388, Final residual = 0.0009982551183, No Iterations 1
smoothSolver:  Solving for Uz, Initial residual = 0.2633078552, Final residual = 0.00105323674, No Iterations 1
GAMG:  Solving for p, Initial residual = 0.3739672548, Final residual = 0.002374599974, No Iterations 8
time step continuity errors : sum local = 1.428765825e-08, global = -2.232009691e-09, cumulative = -5.581283006e-10
GAMG:  Solving for p, Initial residual = 0.3158552079, Final residual = 5.5460372e-08, No Iterations 34
time step continuity errors : sum local = 2.931379403e-13, global = -6.818714439e-14, cumulative = -5.581964878e-10
PIMPLE: Iteration 2

and inside the generated file the following data pops up:

                                                      

1:276:deltaT = 1.199040767e-05
2:329:deltaT = 1.437123682e-05
3:382:deltaT = 1.722562756e-05
4:435:deltaT = 2.065645794e-05
5:488:deltaT = 2.477744706e-05

Last question, ¿is there any possibility to get only the value of the deltaT?. Thanks in advance.

[Bloerb]

You could always use a functionObject and write out every time step for any quantity like the inflow velocity and get it from there.


Directly from the logfile you should learn awk. Very helpful for manipulating text files in many many ways. awk looks at a text file a line at a time and does some manipulation. So much like grep but way more flexibility.


Examples:

awk '{if ($0 ~ "deltaT") print $0}' logfile

If the line ($0) contains (~) the string "deltaT" print the entire line.

awk '{if ($0 ~ "deltaT") print $1}' logfile

If the line ($0) contains (~) the string "deltaT" print the first column
in awk columns are separated by empty space.

awk '{if ($1 == "deltaT") print $3}' logfile

If the first column ($1) is exaclty equal to deltaT print the third column.


So if a logfile like this

Courant Number mean: 0.002301022713 max: 0.05578931023
deltaT = 1.199040767e-05
Time = 1.19904e-05

the following code would print the value 1.199040767e-05

awk '{if ($0 ~ "deltaT") print $3}' logfile

You can do more complex manipulations as well.


You can make it more complex like this:

awk '{
if ($0 ~ "deltaT") {currentDeltaT= $3}
if ($0 ~ "Time") {currentTimeStep = $3}




if ($0 == "PIMPLE: Iteration 1") {print currentDeltaT,currentTimeStep}


}' logfile >result.dat

You need to modify this a bit, but i think you get the basic idea.