Changes between Version 416 and Version 417 of doc/app/initialization_parameters

Timestamp:

Jan 14, 2019 12:54:16 PM (6 years ago)

Author:

maronga

Comment:

--

doc/app/initialization_parameters

@@ -1685 +1685 @@
 Upper limit of the horizontal range for which random perturbations are to be imposed on the horizontal velocity field (grid points).\\\\
 If non-cyclic lateral boundary conditions are used (see [#bc_lr bc_lr] or [#bc_ns bc_ns]), this parameter gives the grid point number (counted horizontally from the inflow) up to which perturbations are imposed on the horizontal velocity field. Perturbations must be switched on with parameter [../d3par#create_disturbances create_disturbances].
-}}}
-|----------------
-{{{#!td style="vertical-align:top"
-[=#most_method '''most_method''']
-}}}
-{{{#!td style="vertical-align:top"
-C*8
-}}}
-{{{#!td style="vertical-align:top"
-'newton'
-}}}
-{{{#!td
-Parameter that defines how the Obukhov length is calculated when a [#constant_flux_layer constant_flux_layer] is switched on. Available methods are:\\\\
-* ''''circular'''': A fast method that was the previous default in PALM. Here, the Obukhov length is calculated based on the values of t* (and q*) calculated from the previous time step. This circular calculation leads to a time lag in the Obukhov length and is thus inaccurate.\\\\
-* ''''newton'''': The Obukhov length is calculated by means of the Richardson number and a Newton iteration algorithm. This method yields correct values of the Obukhov length, but it is slower than the 'circular' and 'lookup' methods. Furthermore, it cannot be vectorized.\\\\
-* ''''lookup'''': This method is similar to the Newton iteration method, but the iteration is avoided by creating a lookup table of the Obukhov length against Richardson number at the beginning of the simulation. This method yields accurate values of the Obukhov length while being less computationally expensive compared to the Newton iteration method. However, it cannot be used in case of varying roughness lengths (unless the roughness lengths are locally homogeneous on each processor domain).
-\\\\
 }}}
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