CFD Online Discussion Forums - [swak4Foam] need funkysetfields to creat a droplet

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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.

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?

Quote:

Originally Posted by S.Jafari (Post 397657)

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

Code:

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

missed a }
thank you for your reply

Quote:

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

Quote:

Originally Posted by nimasam (Post 397835)

missed a }
thank you for your reply

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

thank you so much for the answer :)

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?

you should enter time argument

Quote:

funkySetFields -time 0

Quote:

Originally Posted by nimasam (Post 443699)

you should enter time argument

thnax nima...i found it...