[gemaforce]

Hi, I just want to know if there's a way of capturing the log data into spreadsheets like Open Office. I would like to take the information printed on the log file and chart it out you see.

Thanks!

Samuel

[gschaider]

Hi Samuel!

You'll have to extract the info into CSV-files (or something similar). This is for instance done by the foamLog-Skript described in section 7.6 of the UserGuide or (beware: advertising) by some of the pyFoam-Utilities

Bernhard

[gemaforce]

Thank you so much Bernhard!I understand how to do it now!

[gemaforce]

Sorry, but I may sound really stupid at this point in time..

I tried following the UserGuide section 7.6, but I encountered a problem. I can't seem to execute the foamLog script within OpenFOAM. It says on the UserGuide that I have to type in foamLog <root> <case> <logfile>, but I'm not sure which logFile I'm referring to because I can't find the subdirectory called logs anywhere in OpenFOAM-1.4.1.

Please guide me along.

Thank you,
Samuel

[asaha]

Hello,

A log file is created in the case directory when you execute:

foamJob <solver> <root> <case>


Then you need to execute:

foamLog <root> <case> <logfile>

[gemaforce]

Oh ok! I get it now! I thought the logFile was there all along and when I tried to execute it, I thought the system hung right there! Thank you!

[asaha]

Hello,

I get the following log for each time step:

Courant Number mean: 0.0201787 max: 0.264922
deltaT = 0.00473396
Time = 0.0263302

MULES: Solving for gamma
Liquid phase volume fraction = 0.130194 Min(gamma) = -7.81823e-47 Max(gamma) = 1
MULES: Solving for gamma
Liquid phase volume fraction = 0.130194 Min(gamma) = -7.444e-47 Max(gamma) = 1
DICPCG: Solving for pd, Initial residual = 0.0305024, Final residual = 0.000290093, No Iterations 1
DICPCG: Solving for pd, Initial residual = 0.000299968, Final residual = 1.33247e-05, No Iterations 10
DICPCG: Solving for pd, Initial residual = 2.02136e-05, Final residual = 9.3558e-08, No Iterations 36
time step continuity errors : sum local = 5.60007e-07, global = 4.57038e-08, cumulative = 1.23805e-07
Mass of Fluid 1 = 0.646099 kg
ExecutionTime = 0.53 s ClockTime = 1 s


I wish to extract the information for "Liquid phase volume fraction = 0.130194" for each time step from the log file. I tried to use the foamLog script, but this information is particularly missing in the subdirectory log.

Kindly help me.

Regards,

A A Saha.

[ngj]

Hi Saha, and good morning to everyone

If your log file is called runLog, I would do the following from the command line:

grep -A3 -E "^Time" runLog | grep -v "MULES"

Then you at least have the data written to screen / can redirect it to a file. If you need the data to be plotted using some script, you probably want the data in a tab-separated file, this could be done like this:

grep -A3 -E "^Time" runLog | grep -v "MULES" | sed -e 's/\//'| awk 'BEGIN {RS="T"} {print $3,$9}' > myLiquidFraction

The part sed -e 's/\//' might be omitted, but I got some weird formating, which I removed by that command.

Have fun

- Niels

[msrinath80]

Alternately locate the file known as foamLog.db and add an entry for 'Liquid phase...whatever' in it. Now, foamLog can extract that info for you!

[asaha]

Hello Srinath,

Thanks for your post. I added the entry in the foamLog.db and the Liquid phase is now available in foamLog.

Thanks,

A A Saha

[asaha]

Hello Niels,

Thanks for your post. The command line option works great and serves exactly what I was looking for.

I got the following error:

sed: -e expression #1, char 5: unterminated `s' command

Omitting sed -e 's/\//' it workes fine.

Thanks again.


Regards,

A A Saha