| 81 | | Two-moment cloud physics (Seifert and Beheng, 2006) have been implemented. Therefore, two new prognostic equations (nr: rain drop number density; qr: rain water content) and associated basic output quantities are introduced (advec_ws, average_3d_data, boundary_conds, check_parameter, data_output_2d, data_output_3d, flow_statistics, init_3d_model, init_cloud_physics, modules, netcdf, parin, prognostic_equations, read_3d_binary, read_var_list, sum_up_3d_data, swap_timelevel, time_integration, user_actions, write_3d_binary, write_var_list). |
| 82 | | |
| 83 | | Microphysical tendencies affecting the prognostic equations of liquid water potential temperature, specific humidity, rain drop number density and rain water content are computed in the new module microphysics (additional changes: calc_liquid_water_content, Makefile). |
| 84 | | |
| 85 | | According to the CFL criterion, the timestep has to be reduced in case of precipitation (timestep). |
| | 81 | '''New cloud physics:'''\\ |
| | 82 | Two-moment cloud physics (Seifert and Beheng, 2006) have been implemented. Therefore, two new prognostic equations (nr: rain drop number density; qr: rain water content) and associated basic output quantities are introduced (advec_ws, average_3d_data, boundary_conds, check_parameter, data_output_2d, data_output_3d, flow_statistics, init_3d_model, init_cloud_physics, modules, netcdf, parin, prognostic_equations, read_3d_binary, read_var_list, sum_up_3d_data, swap_timelevel, time_integration, user_actions, write_3d_binary, write_var_list). Microphysical tendencies affecting the prognostic equations of liquid water potential temperature, specific humidity, rain drop number density and rain water content are computed in the new module microphysics (additional changes: calc_liquid_water_content, Makefile). According to the CFL criterion, the timestep has to be reduced in case of precipitation (timestep). |
| | 83 | |
| | 84 | '''Steering:'''\\ |
| | 85 | The new cloud physics scheme can be used with [wiki:doc/app/inipar#humidty humidity] = .TRUE. and [wiki:doc/app/inipar#cloud_physics cloud_physics] = .TRUE.. It is the the default value of the new steering parameter [wiki:doc/app/inipar#cloud_scheme cloud_scheme] = 'seifert_beheng' ([wiki:doc/app/inipar#cloud_scheme cloud_scheme] = 'kessler' allows the use of the former cloud physics scheme). It is not allowed to use the new cloud physics without [wiki:doc/app/inipar#precipitation precipitation] = .TRUE. ([wiki:doc/app/errmsg#PA0363 PA0363]). |
| | 86 | |
| | 87 | The ventilation effect on evaporation of rain drops according to Seifert (2008) has been implemented and can be activated with [wiki:doc/app/inipar#ventilation_effect ventilation_effect]. |
| | 88 | |
| | 89 | Drizzle of raindrops according to Heus et al. (2010) has been implemented and can be activated with [wiki:doc/app/inipar#drizzle drizzle]. |
