GfsInitMask

From Gerris

GfsInitMask can be used to "mask out" (i.e. remove) cells on part of the mesh. Slip wall boundary conditions are applied on the boundaries of the resulting holes.

The syntax in parameter files is:

[ GfsGenericInit ] [ GfsFunction ]

where cells for which the GfsFunction is non-zero will be masked out.

Examples

• Dam break on complex topography

    InitMask {} (y < 8.*(0.5 - 1./512.))

• Multi-layer Saint-Venant solver

    InitMask {} (y < RATIO*(0.5 - 1./pow(2,LEVEL)))

• Wind-driven stratified lake

    InitMask {} (y < RATIO*(0.5 - 1./pow(2,LEVEL)))

• Oscillations in a parabolic container

    InitMask {} (y < 10000.*(0.5 - 1./pow(2,LEVEL)))

• Transcritical flow over a bump

    InitMask {} (y < 25.*(0.5 - 1./pow(2,LEVEL)))

• Transcritical flow with multiple layers

    InitMask {} (y < LENGTH*(0.5 - 1./pow(2,LEVEL)))