5.3.11 Dust: dustscheme=dust_k3mon_03

In this section the parameters for dustscheme=dust_k3mon_03 (simple 2-bin dust scheme for Forsterite dust) are described:

• integer n_dustgrainradius:
  The number of dust grain radius bins (including one for the monomers) is specified with
  integer n_dustgrainradius f=I8 b=4 n='Number of dust grain radius bins' &
    c1='Includes: bin for monomers'
  2
  
  The default value is 1 (to avoid an empty array). The value should be the same as the upper dimension in real ar_dustgrainradius. For the current dust scheme, there should always be exactly two bins.

• real ar_dustgrainradius:
  The radii of the dust grains are specified with e.g.
  real ar_dustgrainradius f=E10.4 b=4 p=1 d=(1:2) n='Dust grain radii' u=cm
  0.0
  1.0E-04
  
  The default value is 0.0.

• real c_dust01:
  The density of the grain material is specified with e.g.
  real c_dust01 f=E15.8 b=4 n='Density of grain material' u=g/cm^3
  3.3E+00
  

• real c_dust02:
  The atomic weight of the "dust monomer" is specified with e.g.
  real c_dust02 f=E15.8 b=4 n='Atomic weight of dust monomer' u=u
  140.71
  
  The value 140.71 should be appropriate for Forsterite (Mg$_2$SiO$_4$). The unit is the atomic mass unit. The default value is 0.0.

• real c_dust03:
  The number fraction of the rarest component is specified with e.g.
  real c_dust03 f=E15.8 b=4 n='Number fraction of rarest component' u=1 &
    c0='For Mg2SiO4, Mg is the rarest, its fraction is 3.1187E-05' &
    c1='Mg2SiO4 contains 2 Mg -> * 1/2 -> 1.55935e-05'
  1.55935e-05
  
  For Mg$_2$SiO$_4$ the rarest component is (usually) Mg$_2$. So, half the magnesium abundance is required as value. The default value is 0.0.

• real c_dust04:
  The lower dust limit fraction is specified with e.g.
  real c_dust04 f=E15.8 b=4 n='Lower dust limit fraction' u=1
  1.0E-10
  
  It is used in the calculation of the settling velocity where a division by the total density of monomers and dust is required. To prevent this denominator to become zero a term $c_{\rm dust04} \rho$ is added. The default value is 0.0.

• real c_dust05:
  The minimum number of monomers during condensation is specified with e.g.
  real c_dust05 f=E15.8 b=4 n='Minimum number of monomers during condensation' u=1
  10.0
  
  For very small grains (just one or very few monomers) the condensation rates can be very small in this dust model: nucleation that would form already small clumps of monomers is not considered. Therefore, to speed things up a minimum number of monomers can be given that is considered for the condensation rate. With 1.0 or smaller values the enhancement is switched off. The default value is 0.0.

• real c_dust06:
  The sticking coefficient for the condensation rate is specified with e.g.
  real c_dust06 f=E15.8 b=4 n='Sticking coefficient' u=1 &
    c0='For C-rich dust: 0.37; can be between 0 and 1'
  1.0
  
  The default value is 0.0.