Changes between Version 463 and Version 464 of doc/app/initialization_parameters

Timestamp:

May 6, 2020 3:00:20 PM (5 years ago)

Author:

raasch

Comment:

--

doc/app/initialization_parameters

@@ -740 +740 @@
 Number of grid points in x-direction.\\\\
 A value for this parameter must be assigned. Since the lower array bound in PALM starts with i = 0, the actual number of grid points is equal to '''nx+1'''. In case of cyclic boundary conditions along x, the domain size is ('''nx+1''')* [#dx dx].\\\\
-For parallel runs '''nx+1''' must be an integral multiple of the number of processors (see [../d3par#npex npex] and [../d3par#npey npey]) along x- as well as along y-direction (due to data transposition restrictions).\\\\
+For parallel runs '''nx+1''' must be an integral multiple of the number of processors along x-direction (see [../d3par#npex npex]). If the fft-solver is used for calculating the Poisson equation (see [#psolver psolver]), it must be an integral multiple of the number of processors along y-direction, too (see [../d3par#npey npey]), due to data transposition restrictions.\\\\
 For coupled runs ([../examples/coupled see details])  the product of '''dx''' and '''nx'''  in both parameter files [../iofiles#PARIN PARIN] and [../iofiles#PARIN_O PARIN_O] has to be same (same model domain length in x-direction).
 }}}
@@ -756 +756 @@
 Number of grid points in y-direction.\\\\
 A value for this parameter must be assigned. Since the lower array bound in PALM starts with j = 0, the actual number of grid points is equal to '''ny+1'''. In case of cyclic boundary conditions along y, the domain size is ('''ny+1''') * [#dy dy].\\\\
-For parallel runs '''ny+1''' must be an integral multiple of the number of processors (see [../d3par#npex npex] and [../d3par#npey npey])  along y- as well as along x-direction (due to data transposition restrictions).\\\\
+For parallel runs '''ny+1''' must be an integral multiple of the number of processors along y-direction. (see [../d3par#npey npey]). If the fft-solver is used for calculating the Poisson equation (see [#psolver psolver]), it must be an integral multiple of the number of processors along x-direction, too (see [../d3par#npex npex]), due to data transposition restrictions.\\\\
 For coupled runs ([../examples/coupled see details])  the product of '''dy''' and '''ny'''  in both parameter files [../iofiles#PARIN PARIN] and [../iofiles#PARIN_O PARIN_O] has to be same (same model domain length in y-direction).
 }}}
@@ -772 +772 @@
 Number of grid points in z-direction.\\\\
 A value for this parameter must be assigned. Since the lower array bound in PALM starts with k = 0 and since one additional grid point is added at the top boundary (k = '''nz+1'''), the actual number of grid points is '''nz+2'''. However, the prognostic equations are only solved up to '''nz''' (u, v, scalar quantities) or up to '''nz-1''' (w). The top boundary for u, v and scalar quantities is at k = '''nz+1''' (u, v) while at k = '''nz''' for w.\\\\
-For parallel runs, '''nz''' must be an integral multiple of the number of processors in x-direction (due to data transposition restrictions).
+For parallel runs, and if the fft-solver is used for calculating the Poisson equation (see [#psolver psolver]), '''nz''' must be an integral multiple of the number of processors in x-direction (due to data transposition restrictions).
 }}}