Physical properties

Specify physical constants. How this is done depends mostly on your choice of multi phase solver (see Multi phase solver). A single phase example:

physical_properties:
    g: [0, 0, 0]
    nu: 0.001
    rho: 1.0
g

The acceleration of gravity given as a list of numbers. The length of the list must match the number of spatial directions, e.g. 2 or 3. Use [0, -9.81] in 2D and [0, 0, -9.81] in 3D for “standard” gravity.

Single phase properties

nu

The kinematic viscosity

rho

The density of the fluid, defaults to 1.0.

VOF two phase properties

nu0, rho0

The kinematic viscosity and density of fluid 0

nu1, rho1

The kinematic viscosity and density of fluid 1

For a water/air simulation fluid 0 is typically water and corresponds to VOF colour function value 1.0 while fluid 1 is typically air and corresponds to VOF colour function value 0.0.

Variable density properties

nu

The kinematic viscosity of both fluids (single value)

rho_min, rho_max

The range of allowable densities. Give one number for each of these settings.