Changes between Version 60 and Version 61 of doc/app/initialization_parameters

Timestamp:

Sep 14, 2010 11:15:11 AM (14 years ago)

Author:

kanani

Comment:

--

doc/app/initialization_parameters

@@ -265 +265 @@
 |----------------
 {{{#!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>
-}}}
-|----------------
-{{{#!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>
+[=#km_constant '''km_constant''']
+}}}
+{{{#!td style="vertical-align:top"
+R
+}}}
+{{{#!td style="vertical-align:top"
+variable (computed from TKE)
+}}}
+{{{#!td
+Constant eddy diffusivities are used (laminar simulations).\\\\
+If this parameter is specified, both in the 1d and in the 3d-model constant values for the eddy diffusivities are used in space and time with K,,m,, = '''km_constant''' and K,,h,, = K,,m,, / [[prandtl_number]]. The prognostic equation for the subgrid-scale TKE is switched off. Constant eddy diffusivities are only allowed with the Prandtl layer ([#prandtl_layer prandtl_layer]) switched off.
+}}}
+|----------------
+{{{#!td style="vertical-align:top"
+[=#km_damp_max '''km_damp_max''']
+}}}
+{{{#!td style="vertical-align:top"
+R
+}}}
+{{{#!td style="vertical-align:top"
+0.5*([#dx dx] or [#dy dy])
+}}}
+{{{#!td
+Maximum diffusivity used for filtering the velocity field in the vicinity of the outflow (in m^2^/s).\\\\
+When using non-cyclic lateral boundaries (see [#bc_lr bc_lr] or [#bc_ns bc_ns]), a smoothing has to be applied to the velocity field in the vicinity of the outflow in order to suppress any reflections of outgoing disturbances. Smoothing is done by increasing the eddy diffusivity along the horizontal direction which is perpendicular to the outflow boundary. Only velocity components parallel to the outflow boundary are filtered (e.g. v and w, if the outflow is along x). Damping is applied from the bottom to the top of the domain.\\\\
+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.
 }}}
 |----------------