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GfsBubbleFraction defines the concentration of GfsBubbles as a projection of the bubble volume onto the grid using a user-defined kernel function.

The syntax is

[ GfsParticulateField ] { kernel = [ GfsFunction ] rkernel = RAD } 


is a GfsFunction that defines the kernel used to project the bubble volume onto the grid,
is the nondimensional radius of the region of kernel projection around the bubble.

Both variables are defined in nondimensional units, where the characteristic length is the bubble radius. That is, x represents x/R.

The kernel function is internally multiplied by a constant to satisfy that the discrete integral of the kernel over the volume of projection is 1.

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