Dear all
I have done some simulation of rising bubble in a quiescent medium using OpenFOAM, but in order to validate it, I need to track its center of gravity. I can see the animation using paraview, but how to get its rising velocity and center of gravity? If some tutorial is available, then it would be of great help to me. Thanks
You can go to following link. The utility posted on that link calculates centre of mass of drop or bubble with respect to time.
Hope this helps!
Enjoy
Hrushikesh
http://www.cfd-online.com/Forums/openfoam-solving/58449-rise-spherical-bubble-terminal-velocity-3.html#post456217
Hi Jai,
This should be possible. If you are using Volume of Fluid as interface advection model, then a way to track the cg of the bubble is using an expression similar to:
[sum_i (VOF_i * cell_vol_i * U_i)] / [sum_i (VOF_i * cell_vol_i)]
Here i sums over all cells, U is the velocity component in the rise direction and cell_vol_i is the volume of cell i. Note that this works generally well as long as the bubble does not break up. It should be possible to calculate this in Paraview using the calculator tool during post-processing.
Regards,
guido.
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