GfsSource

From Gerris

GfsSource is used to associate a source term to a variable.

The syntax in parameter files is:

 [ GfsSourceScalar ] [ GfsFunction ]

The dimensions of the GfsFunction are the dimensions of the variable per unit time (except when the variable is the pressure "P", see next).

When GfsSource is used for the pressure "P" used by the GfsSimulation solver, the source term is a "volume source" (or sink) S such that:

∇.u = S

Examples

• Rayleigh-Taylor instability

  Source {} V -9.81

• Boussinesq flow generated by a heated cylinder

  Source V T

• Collapse of a column of grains

    Source V -1

• Air-water flow around a Series 60 cargo ship

    Source U (x > -0.375 ? 0 : 10.*(FROUDE - U))

• Forced isotropic turbulence in a triply-periodic box

  Source U 0.1*(U - Ubar)

  Source V 0.1*(V - Vbar)

  Source W 0.1*(W - Wbar)

• Flow created by a cylindrical volume source

    Source P F

• Boundary layer on a rotating disk

    Source V W*W/y

• Poiseuille flow

    Source U 1

    Source V 1

• Bagnold flow of a granular material

    Source V -cos(ALPHA)

    Source U  sin(ALPHA)

• Poiseuille flow with metric

    Source U 1

    Source V 1

• Poiseuille flow with multilayer Saint-Venant

    Source U A*P/NL

• Hydrostatic balance with solid boundaries and viscosity

    Source V -1

• Hydrostatic balance with quadratic pressure profile

    Source V -rho