CFD Online Discussion Forums - Finding Q and vorticity for FSI case

CFD Online Discussion Forums (https://www.cfd-online.com/Forums/)

- OpenFOAM CC Toolkits for Fluid-Structure Interaction (https://www.cfd-online.com/Forums/openfoam-cc-toolkits-fluid-structure-interaction/)

- - Finding Q and vorticity for FSI case (https://www.cfd-online.com/Forums/openfoam-cc-toolkits-fluid-structure-interaction/241871-finding-q-vorticity-fsi-case.html)

Finding Q and vorticity for FSI case

Hello all,

I am stuck trying to post process the results of my FSI simulation to try get data for Q and vorticity.

I have managed to get wall shear stress data by using 'wallShearStresss -region fluid', but that does not work for Q or vorticity and I get the output:

Code:

options:

  -DebugSwitches <key1=val1,key2=val2,...>

  -DimensionedConstants <key1=val1,key2=val2,...>

  -InfoSwitches <key1=val1,key2=val2,...>

  -OptimisationSwitches <key1=val1,key2=val2,...>

  -Tolerances <key1=val1,key2=val2,...>

  -case <dir>       specify alternate case directory, default is the cwd

  -constant         include the 'constant/' dir in the times list

  -dict <dictionary name>

  -dumpControlSwitches

  -latestTime       select the latest time

  -newTimes         select the new times

  -noFunctionObjects

                    do not execute functionObjects

  -noWrite

  -noZero           exclude the '0/' dir from the times list, has precedence

                    over the -withZero option

  -parallel         run in parallel

  -roots <(dir1 .. dirN)>

                    slave root directories for distributed running

  -time <ranges>    comma-separated time ranges - eg, ':10,20,40:70,1000:'

  -srcDoc           display source code in browser

  -doc              display application documentation in browser

  -help             print the usage



Using: foam-extend-4.1 (see www.foam-extend.org)

Build: 4.1-70b064d0f326

Please can somebody please help me to find Q and vorticity from an already completed simulation.

Best regards
Merlin

Inconveniently, many of the utilities do not yet have the "-region" option.
So your options are:

Make a copy of the utility of interest and add the "-region" option in the code and compile the utility with a new name e.g. myWallShearStress and place it in FOAM_USER_APPBIN
Or, temporarily move the fluid fields from the fluid region to the main/default region, then run the utility on the case (no need for "-region") then move the fields back, e.g. see some example bash code below

Example bash code for option 2 to move fluid region fields to the main/default region:

Code:

#!/bin/bash                                                                                                                                                                                                 



for i in $(foamListTimes)

do

    echo "${i}"

    cd "${i}"

    mv fluid/* .

    cd ..

done

Then run the utility.

Example bash code for option 2 to move main/default fields back to the fluid region:

Code:

#!/bin/bash                                                                                                                                                                                                 



shopt -s extglob



for i in $(foamListTimes)

do

    echo "${i}"

    cd "${i}"

    mv !(solid|fluid) fluid/

    cd ..

done

Dear Mr Cardiff,

Thank you very much for this response. Sadly I already used option 2 and had to go through and move the files individually and this would have saved a lot of time. But I will absolutely use it again if I need to.

Thank you for your help
Merlin