Offline nesting parameters

Since revision -r3347 an offline nesting is available in PALM. Therefore, time-dependent values for the three velocity components, potential temperature as well as the mixing ratio for the lateral and top boundaries of the PALM model domain are stored in the dynamic input file and are read and mapped onto the respective arrays during the simulation. This way, it is possible to account for changing synoptic conditions during the simulation without adding further tendency terms or to nudge the LES solution.

A detailed description will follow soon. Please note, this feature currently undergoes extensive testing.

NAMELIST group name: nesting_offl_parameters

Parameter Name	FORTRAN Type	Default Value	Explanation
nesting_offline	L	.F.	Flag to enable the mesoscale offline nesting of the PALM-domain into a larger-scale model. If set to .TRUE., lateral and top boundary data for the velocity components, potential temperature and mixing_ratio (humidity) are read from the dynamic input file (see PIDS_DYNAMIC). Boundary data can be created with the preprocessor INIFOR, which is currently tailored towards the COSOM-model (other models will follow). Please note, offline nesting is only possible if an dynamic input file (see PIDS_DYNAMIC) is available. Note, as the mesoscale model output does not contain turbulence, this need to be imposed at the lateral inflow boundaries by employing the synthetic turbulence generator (see STG) to trigger the spatial development of the turbulent flow .