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GfsInitFraction is used to initialise a volume-fraction field from a given surface (typically the shape of an interface to be represented using a Volume-Of-Fluid formulation).

The syntax in parameter files is:

[ GfsGenericInit ] V [ GfsSurface ]

where V is a GfsVariable.

If GfsSurface is defined implicitly, by convention the volume fraction of cells not cut by the interface is set to one if the implicit function is positive and zero otherwise.


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