Changes between Version 166 and Version 167 of doc/app/initialization_parameters

Timestamp:

Oct 24, 2011 9:14:09 AM (13 years ago)

Author:

letzel

Comment:

--

doc/app/initialization_parameters

@@ -853 +853 @@
       If [#mg_cycles mg_cycles] is set to its optimal value, the computing time of the multi-grid scheme amounts approximately to that of the direct solver '' 'poisfft','' as long as the number of grid points in the three directions of space corresponds to a power-of-two (2^n^) where ''n'' >= 5 must hold. With large ''n'', the multi-grid scheme can even be faster than the direct solver (although its accuracy is several orders of magnitude worse, but this does not affect the accuracy of the simulation). Nevertheless, the user should always carry out some test runs in order to find out the optimum value for [#mg_cycles mg_cycles], because the CPU time of a run very critically depends on this parameter.\\\\
       This scheme requires that the number of grid points of the subdomains (or of the total domain, if only one PE is uesd) along each of the directions can at least be devided once by 2 without rest.\\\\
-With parallel runs, starting from a certain grid level the data of the subdomains are possibly gathered on PE0 in order to allow for a further coarsening of the grid. The grid level for gathering can be manually set by [#mg_switch_to_pe0_level mg_switch_to_pe0_level].\\
-Using this procedure requires the subdomains to be of identical size (see [#grid_matching grid_matching]).\\\\
+      With parallel runs, starting from a certain grid level the data of the subdomains are possibly gathered on PE0 in order to allow for a further coarsening of the grid. The grid level for gathering can be manually set by [#mg_switch_to_pe0_level mg_switch_to_pe0_level].\\
+      Using this procedure requires the subdomains to be of identical size (see [#grid_matching grid_matching]).\\\\
 '' 'sor' ''\\\\
       Successive over relaxation method (SOR). The convergence of this iterative scheme is steered with the parameters [#omega_sor omega_sor], [#nsor_ini nsor_ini] and [#nsor nsor].\\