Changes between Version 17 and Version 18 of doc/app/chemistry_parameters

Timestamp:

Oct 11, 2018 1:37:10 PM (7 years ago)

Author:

forkel

Comment:

--

doc/app/chemistry_parameters

@@ -49 +49 @@
 ||='''Parameter Name'''  =||='''[[../fortrantypes|FORTRAN]]\\[[../fortrantypes|Type]]'''  =||='''Default\\Value'''  =||='''Explanation'''  =||
 |----------------
+{{{#!td style="vertical-align:top; width: 150px"
+[=#cs_surface '''bc_cs_b''']
+}}}
+{{{#!td style="vertical-align:top; width: 50px"
+R
+}}}
+{{{#!td style="vertical-align:top; width: 75px"
+0.0
+}}}
+{{{#!td
+Bottom boundary condition of the chemical species ('cs')concentration.
+
+ Allowed values are  'dirichlet'  (cs(k=0) = const. = cs_surface + cs_surface_initial_change; When a constant surface concentration flux is used (surface_cs_flux) or emissions are applied ('do_emis' = .T.), bc_cs_b =  'neumann'  must be used. }}}
+
+{{{#!td style="vertical-align:top; width: 150px"
+[=#cs_surface '''bc_cs_t''']
+}}}
+{{{#!td style="vertical-align:top; width: 50px"
+R
+}}}
+{{{#!td style="vertical-align:top; width: 75px"
+0.0
+}}}
+{{{#!td
+Top boundary condition of the scalar concentration.
+
+ Allowed are the values  'dirichlet'  (cs(k=nz+1) does not change during the run),  'neumann'  (cs(k=nz+1) = cs(k=nz)), 
+
+### RFo No idea whther this also works für cs
+and  'initial_gradient' . 
+With the  'initial_gradient'  boundary condition the value of the scalar concentration gradient at the top is calculated from the initial scalar concentration profile (see cs_surface, cs_vertical_gradient) by: bc_cs_t_val = (cs_init(k=nz) - ss_init(k=nz-1)) / dzu(nz). Using this value (assumed constant during the run) the concentration boundary values are calculated as 
+
+
+cs(k=nz+1) = cs(k=nz) + bc_cs_t_val * dzu(nz+1) 
+
+(up to k=nz the prognostic equation for the chemical species concentration is solved). 
+###
+
+When a constant cs flux is used at the top boundary (top_csflux), bc_cs_t = 'neumann' must be used, because otherwise the resolved scale may contribute to the top flux so that a constant value cannot be guaranteed.
+}}}
+
 {{{#!td style="vertical-align:top; width: 150px"
 [=#cs_surface '''cs_surface''']