[Zuixy]

Thank you. You helped me a lot. I think i understand now how it works.

Unfortunately it doesn't work at all with potentialWaveFoam. I try to figure out why and will post it, if i succeed.

[S.Jafari]

hi
im new in openFoam too. im trying to simulate falling droplet. for having a set of results i use swak4foam to get the information of field deitalls. i wrote the function for calculating mass center of falling drop. now i want to find some other variables in each time step (such as velocity) using the mass center that i found as i said.
explaining more:
i wrote function for calculating mass center in each step time (x)
now i want to use x to calculate velocity in this formulation: v=[x(2)-x(1)]/deltaT
how can i match these function in control dict?

[gschaider]

Originally Posted by S.Jafari

hi
im new in openFoam too. im trying to simulate falling droplet. for having a set of results i use swak4foam to get the information of field deitalls. i wrote the function for calculating mass center of falling drop. now i want to find some other variables in each time step (such as velocity) using the mass center that i found as i said.
explaining more:
i wrote function for calculating mass center in each step time (x)
now i want to use x to calculate velocity in this formulation: v=[x(2)-x(1)]/deltaT
how can i match these function in control dict?

One possibility would be to use a storedVariable (this is just a sketch):

variables (
  "newPos= <however you calculate your mass centern>;"
  "velocity=(newPos-oldPos)/deltaT();"
  "oldPos=newPos;"
);
expression "velocity";
storedVariables (
  {
     name oldPos;
    initialValue "vector(0,0,0)";
);

Initial value is the tricky part because that might cause a velocity "jump" in the beginning

Or you can always load the positions you calculated into a spreadsheet and do the calculation there

[nimasam]

missed a }
thank you for your reply

variables ( "newPos= <however you calculate your mass centern>;" "velocity=(newPos-oldPos)/deltaT();" "oldPos=newPos;" ); expression "velocity"; storedVariables ( { name oldPos; initialValue "vector(0,0,0)";
}
);

[gschaider]

Originally Posted by nimasam

missed a }
thank you for your reply

That's what I mean with "just a sketch"

[S.Jafari]

thank you so much for the answer

[mecman]

Hi all
i want use of FunkySetFields for may case in OpenFoam2.1.1,i instal swak4Foam for this version witout problem,i made FunkySetFieldsDict for my case and after when i run that i see this problem

--> FOAM FATAL ERROR:
funkySetFields: time/latestTime option is required
From function main()
in file funkySetFields.C at line 641.
FOAM exiting
what is my mistake?

[nimasam]

you should enter time argument

funkySetFields -time 0

[mecman]

Originally Posted by nimasam

you should enter time argument

thnax nima...i found it...