subsection Material model
  set Model name = simple

  subsection Simple model
    set Thermal conductivity                           = 1e-6
    set Thermal expansion coefficient                  = 0.01
    set Viscosity                                      = 1
    set Reference density                              = 1
    set Reference temperature                          = 0
    set Density differential for compositional field 1 = 0.1
  end
end
