The condensation scheme currently requires you to specify a characteristic "timescale" over which the condensation occurs. This is important in determining how easily T can drop below T_dew for a given gas, being forced by radiative cooling or other transport processes.
In reality, this is set by the microphysics of the system, but typically the timescale will shrink as the amount of supersaturation increases. There's also a factors depending on the droplet size(s), the available condensation nuclei, and so on.
It would be interesting to implement a (simple!!) microphysical model of condensation into AGNI, which (I think) would fit relatively easily into the current formulation.
- Calculate droplet size
- Calculate condensation rate
- Estimate the frictional dissipation of falling droplets
- Update the solver with a relaxation scheme on the cloud profiles, similarly to the
easy_start=true flag for convection, so that it can reliably obtain a solution when aerosols/clouds are enabled
The condensation scheme currently requires you to specify a characteristic "timescale" over which the condensation occurs. This is important in determining how easily T can drop below T_dew for a given gas, being forced by radiative cooling or other transport processes.
In reality, this is set by the microphysics of the system, but typically the timescale will shrink as the amount of supersaturation increases. There's also a factors depending on the droplet size(s), the available condensation nuclei, and so on.
It would be interesting to implement a (simple!!) microphysical model of condensation into AGNI, which (I think) would fit relatively easily into the current formulation.
easy_start=trueflag for convection, so that it can reliably obtain a solution when aerosols/clouds are enabled