Changes between Version 53 and Version 54 of doc/app/initialization_parameters

Timestamp:

Sep 14, 2010 9:39:16 AM (14 years ago)

Author:

kanani

Comment:

--

doc/app/initialization_parameters

@@ -243 +243 @@
 |----------------
 {{{#!td style="vertical-align:top"
-[=#<insert_parameter_name> '''<insert_parameter_name>''']
-}}}
-{{{#!td style="vertical-align:top"
-<insert type>
-}}}
-{{{#!td style="vertical-align:top"
-<insert value>
-}}}
-{{{#!td
-<insert explanation>
+[=#galilei_transformation '''galilei_transformation''']
+}}}
+{{{#!td style="vertical-align:top"
+L
+}}}
+{{{#!td style="vertical-align:top"
+.F.
+}}}
+{{{#!td
+Application of a Galilei-transformation to the coordinate system of the model.\\\\
+With '''galilei_transformation''' = ''.T.,'' a so-called Galilei-transformation is switched on which ensures that the coordinate system of the model is moved along with the geostrophical wind. Alternatively, the model domain can be moved along with the averaged horizontal wind (see [#use_ug_for_galilei_tr use_ug_for_galilei_tr], this can and will naturally change in time). With this method, numerical inaccuracies of the Piascek - Williams - scheme (concerns in particular the momentum advection) are minimized. Beyond that, in the majority of cases the lower relative velocities in the moved system permit a larger time step ([#dt dt]). Switching the transformation on is only worthwhile if the geostrophical wind (ug, vg) and the averaged horizontal wind clearly deviate from the value 0. In each case, the distance the coordinate system has been moved is written to the file [../iofiles#RUN_CONTROL RUN_CONTROL].\\\\
+Non-cyclic lateral boundary conditions (see [#bc_lr bc_lr] and [#bc_ns bc_ns]), the specification of a gestrophic wind that is not constant with height as well as e.g. stationary inhomogeneities at the bottom boundary do not allow the use of this transformation.
 }}}
 |----------------