GfsVariableTracerVOF

From Gerris

A GfsVariableTracerVOF defines a volume-fraction field advected using the geometrical Volume-Of-Fluid technique.

The syntax in parameter files is:

[ GfsVariableTracer ]

Whenever a new GfsVariableTracerVOF is created called T for example, four additional variables (three in 2D) are automatically created:

T_x

the x-component of the normal to the interface,

T_y

the y-component of the normal to the interface,

T_z

the z-component of the normal to the interface (3D only),

T_alpha

the value such that the normalised equation of the interface in a given cell is given by T_x*x + T_y*y + T_z*z = T_alpha.

The interfacial area (length in 2D) per unit volume (area in 2D) can be computed within a GfsFunction using the predefined area() function. For example

GfsOutputScalarSum { istep = 1 } area { v = area("T") }

with "T" the name of a GfsVariableTracerVOF will compute the time evolution of the total interface area (length in 2D).

Examples

• Rayleigh-Taylor instability

  VariableTracerVOF {} T

• Air-water flow around a Series 60 cargo ship

    VariableTracerVOF T

• Time-reversed VOF advection in a shear flow

    VariableTracerVOF T

• Time-reversed advection with curvature-based refinement

    VariableTracerVOF T

• Mass conservation

    VariableTracerVOF T

• Mass conservation with solid boundary

    VariableTracerVOF T

• Momentum conservation for large density ratios

    VariableTracerVOF T

• Circular droplet in equilibrium

  VariableTracerVOF T

• Axisymmetric spherical droplet in equilibrium

  VariableTracerVOF T

• Planar capillary waves

  VariableTracerVOF T

• Air-Water capillary wave

  VariableTracerVOF T

• Fluids of different densities

  VariableTracerVOF T

• Pure gravity wave

  VariableTracerVOF {} T

• Shape oscillation of an inviscid droplet

    VariableTracerVOF T