GfsVariableTracerVOF

From Gerris

Note that this implementation of VOF tracers has been replaced by GfsVariableTracerVOFHeight and will become obsolete. In particular, GfsVariableTracerVOFHeight combined with GfsVariableCurvature should give consistent interface curvature estimates for parallel simulations. This is not the case for GfsVariableTracerVOF.

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

• Collapse of a column of grains

    VariableTracerVOF T

    VariableTracerVOF Ti

• Viscous folding of a fluid interface

    VariableTracerVOF T

• Savart--Plateau--Rayleigh instability of a water column

    VariableTracerVOF T

• Atomisation of a pulsed liquid jet

    VariableTracerVOF T

• Air-water flow around a Series 60 cargo ship

    VariableTracerVOF T

• Comparison between explicit and implicit diffusion schemes on concentration tracer

    VariableTracerVOF T

• Mass conservation

    VariableTracerVOF T

• Mass conservation with solid boundary

    VariableTracerVOF T

• Dielectric-dieletric planar balance

    VariableTracerVOF T

• Balance with solid boundaries

    VariableTracerVOF T

• Charge relaxation in an axisymmetric insulated conducting column

    VariableTracerVOF T

• Charge relaxation in a planar cross-section

    VariableTracerVOF T

• Equilibrium of a droplet suspended in an electric field

    VariableTracerVOF T