[nimasam]

hi former
i guess, it should be possible to access a bubble velocity with swak4Foam
but i dont know how the procedure can be?
the procedure should be like that:

1) select all cells with alpha < 0.5
2) calculate the gravity center in each time step

any comment or suggestion?

[gschaider]

Originally Posted by nimasam

hi former
i guess, it should be possible to access a bubble velocity with swak4Foam
but i dont know how the procedure can be?
the procedure should be like that:

1) select all cells with alpha < 0.5
2) calculate the gravity center in each time step

any comment or suggestion?

Why use a cutoff? that way you're going to get jumps in your result. Something like

"(pos()*vol()*(1-alpha1))/sum(vol()*(1-alpha1))"

(with an accumulation sum) might give you the center of the "non-fluid".Have a look at my presentation from the last workshop (you'll find it on the swak4Foam-page on the Wiki). Slide 76 has a similar application.

BTW: if you're interested in the velocity of the liquid interface then you might want to have a look at slide 155 where it s demonstrated how to calculate that with sampledSurfaces