Changes between Version 23 and Version 24 of doc/app/examples/cbl

Timestamp:

Jun 17, 2019 9:52:20 AM (6 years ago)

Author:

Giersch

Comment:

--

doc/app/examples/cbl

@@ -2 +2 @@
 
 In this chapter a brief, simple and complete parameter set is described, which can be used to simulate a quasi-stationary, convective, atmospheric boundary layer with zero mean horizontal wind. For evaluation purposes, cross sections and horizontally averaged vertical profiles of typical boundary layer variables are output at the end of the run. \\\\
-The parameter file necessary to carry out a run must be provided to the model as an input file under the local name [../../iofiles#PARIN PARIN] and has the following contents: \\
-
-[../../inipar &initialization_parameters] 
-  [../../inipar#nx nx]{{{ = 39, }}}[../../inipar#ny ny]{{{ = 39, }}}[../../inipar#nz nz]{{{ = 40,}}} \\
-  [../../inipar#dx dx]{{{ = 50.0, }}}[../../inipar#dy dy]{{{ = 50.0, }}} [../../inipar#dz dz]{{{ = 50.0,}}} \\
-  [../../inipar#dz_stretch_level dz_stretch_level]{{{ = 1225.0,}}} [../../inipar#dz_stretch_factor dz_stretch_factor]{{{ = 1.08,}}} \\
-  [../../inipar#initializing_actions initializing_actions]{{{ = 'set_constant_profiles',}}} \\
-  [../../inipar#ug_surface ug_surface]{{{ = 0.0,}}}   [../../inipar#vg_surface vg_surface]{{{ = 0.0,}}} \\
-  [../../inipar#pt_surface pt_surface]{{{ = 300.0,}}} \\
-  [../../inipar#pt_vertical_gradient pt_vertical_gradient]{{{ = 0.0, 1.0,}}} \\
-  [../../inipar#pt_vertical_gradient_level pt_vertical_gradient_level]{{{ = 0.0, 800.0,}}} \\
-  [../../inipar#surface_heatflux surface_heatflux]{{{ = 0.1, }}} [../../inipar#bc_pt_b bc_pt_b]{{{ = 'neumann', }}} \\ 
-  [../../inipar#fft_method fft_method]{{{ = 'temperton-algorithm', /}}} \\\\
-
-[../../d3par &runtime_parameters] 
-  [../../d3par#end_time end_time]{{{ = 3600.0,}}} \\
-  [../../d3par#create_disturbances create_disturbances]{{{ = .T., }}} \\
-  [../../d3par#dt_disturb dt_disturb]{{{ = 150.0, }}}  [../../d3par#disturbance_energy_limit disturbance_energy_limit]{{{ = 0.01, }}} \\
-  [../../d3par#data_output_2d_on_each_pe data_output_2d_on_each_pe]{{{ = .F., }}} \\
-  [../../d3par#dt_run_control dt_run_control]{{{ = 0.0,}}} \\
-  [../../d3par#dt_data_output dt_data_output]{{{ = 900.0, }}} \\
-  [../../d3par#dt_data_output_av  dt_data_output_av]{{{ = 1800.0, }}}   [../../d3par#averaging_interval averaging_interval]{{{ = 900.0, }}}  \\
-  [../../d3par#dt_averaging_input dt_averaging_input]{{{ = 10.0, }}} \\
-  [../../d3par#dt_dopr dt_dopr]{{{ = 900.0,}}} [../../d3par#averaging_interval_pr averaging_interval_pr]{{{ = 600.0,}}} \\
-  [../../d3par#dt_averaging_input_pr dt_averaging_input_pr]{{{ = 10.0, }}} \\
-  [../../d3par#data_output data_output]{{{ = 'w_xy', 'w_xz', 'w_xz_av', 'theta_xy', 'theta_xz', }}} \\
-  [../../d3par#data_output_pr data_output_pr]{{{ = '#theta', 'w”theta”', 'w*theta*', 'wtheta', 'w*2', 'theta*2', }}} \\
-  [../../d3par#section_xy section_xy]{{{ = 2, 10, }}}  [../../d3par#section_xz section_xz]{{{ = 20, /}}} \\
+The convective boundary layer parameter file necessary to carry out a run must be provided to the model as an input file under the local name [../../iofiles#PARIN PARIN]. It is attached to this site (see [attachment:example_cbl_p3d example_cbl_p3d]).
 
 The initialization parameters ([../../inipar &initialization_parameters]) are located at the beginning of the file. For analysis of a convective boundary layer of approx. 1000 m thickness the horizontal size of the model domain should amount to at least ''2 km x 2 km''. In order to resolve the convective structures a grid spacing of [../../inipar#dx dx]'' = ''[../../inipar#dy dy]'' = ''[../../inipar#dz dz]'' = 50 m'' is enough, since the typical diameter of convective plumes is more than ''100 m.'' Thereby the upper array index in the two horizontal directions needs to be [../../inipar#nx nx]'' = ''[../../inipar#ny ny]'' = 39'' . Since in each case the lower array index has the value ''0'', ''40'' grid points are used along both horizontal directions. In the vertical direction the domain must be high enough to include the entrainment processes at the top of the boundary layer as well as the propagation of gravity waves, which were stimulated by the convection. However, in the stably stratified region above the boundary layer the grid resolution has not necessarily to be as high as within the boundary layer. This can be obtained by a vertical stretching of the grid starting from ''1225 m'' via [../../inipar#dz_stretch_level dz_stretch_level]''= 1225.0 m.''