Changes between Version 174 and Version 175 of doc/app/initialization_parameters

Timestamp:

Jul 9, 2012 2:18:52 PM (13 years ago)

Author:

raasch

Comment:

--

doc/app/initialization_parameters

@@ -247 +247 @@
 The horizontal range of the smoothing is controlled by [#outflow_damping_width outflow_damping_width] which defines the number of gridpoints (counted from the outflow boundary) from where on the smoothing is applied. Starting from that point, the eddy diffusivity is linearly increased (from zero to its maximum value given by '''km_damp_max''') until half of the damping range width, from where it remains constant up to the outflow boundary. If at a certain grid point the eddy diffusivity calculated from the flow field is larger than as described above, it is used instead.\\\\
 The default value of '''km_damp_max''' has been empirically proven to be sufficient.
+}}}
+|----------------
+{{{#!td style="vertical-align:top"
+[=#neutral '''neutral''']
+}}}
+{{{#!td style="vertical-align:top"
+L
+}}}
+{{{#!td style="vertical-align:top"
+.F.
+}}}
+{{{#!td
+Parameter to switch off calculation of temperature equation.
+
+For simulating flows with pure neutral stratification, solution of the temperature equation can be switched off with '''neutral''' = ''.T.'' in order to save cpu-time. Additionally, this will also switch off calculation of all buoyancy related terms. \\\\ In case of '''neutral''' = ''.T.'' non-zero values for parameters [#surface_heatflux surface_heatflux] and [#top_heatflux top_heatflux] are not allowed. 
 }}}
 |----------------
@@ -1567 +1582 @@
 In case of a non-flat topography, the internal two-dimensional surface heat flux field '''shf''' is initialized with the value of '''surface_heatflux''' at the bottom surface and [#wall_heatflux wall_heatflux](0) at the topography top face. The parameter random_heatflux can be used to impose random perturbations on this combined surface heat flux field '''shf'''.\\\\
 If no surface heat flux is assigned, '''shf''' is calculated at each timestep by u,,*,, {{{*}}} theta,,*,, (of course only with [#prandtl_layer prandtl_layer] switched on). Here, u,,*,, and theta,,*,, are calculated from the Prandtl law assuming logarithmic wind and temperature profiles between k=0 and k=1. In this case a Dirichlet condition (see [#bc_pt_b bc_pt_b]) must be used as bottom boundary condition for the potential temperature.\\\\
+Non-zero values must not be given for '''surface_heatflux''' in case of simulations with pure neutral stratification (see parameter [#neutral neutral]).\\\\
 See also [#top_heatflux top_heatflux].
 }}}
@@ -1618 +1634 @@
 The application of a top heat flux additionally requires the setting of initial parameter [#use_top_fluxes use_top_fluxes] = ''.T.''.\\\\
 No Prandtl-layer is available at the top boundary so far.\\\\
+Non-zero values must not be given for '''top_heatflux''' in case of simulations with pure neutral stratification (see parameter [#neutral neutral]).\\\\
 See also [#surface_heatflux surface_heatflux].
 }}}