Changes between Version 612 and Version 613 of doc/app/errmsg

Timestamp:

Apr 23, 2019 2:58:28 PM (6 years ago)

Author:

raasch

Comment:

--

doc/app/errmsg

@@ -724 +724 @@
 ||[=#PA0501 PA0501]   || turbulent inflow/outflow is not yet implemented for RANS mode || Setting [wiki:doc/app/inipar#turbulent_inflow turbulent_inflow] or [wiki:doc/app/inipar#turbulent_outflow turbulent_outflow] is not allowed in RANS mode (see namelist parameter [wiki:doc/app/inipar#turbulence_closure turbulence_closure] to switch between LES/RANS mode). ||
 ||[=#PA0502 PA0502]   || RANS mode is still in development! Not all features of PALM are yet compatible with RANS mode. Use at own risk! || As the RANS mode is a relatively new feature in PALM, not all available features are yet tested in combination with the RANS mode. It might be possible that some combinations will not work and the simulation crashes (see namelist parameter [wiki:doc/app/inipar#turbulence_closure turbulence_closure] to switch between LES/RANS mode). ||
-||[=#PA0503 PA0503]   || z0 exceeds surface-layer height at horizontal/vertical natural/urban surface and is decreased appropriately at grid point (i,j) = ... || Roughness length must not exceed the surface-layer height. ||
+||[=#PA0503 PA0503]   || z0 exceeds surface-layer height at horizontal/vertical natural/urban surface and is decreased appropriately at grid point (i,j) = ... || In PALM, Monin-Obukhov similarity is assumed between the surface and the first computational grid point normal to the surface. Because of the staggered grid, the distance between these two points is half of the grid spacing in the respective direction, i.e. dz/2 in vertical direction. The height z = dz/2 defines the top of the (analytical) logarithmic layer zs, which is called the surface layer height here. Now functions like {{{ln(zs/z0)}}}, where z0 is the roughness length, are used to calculate characteristic surface layer variables like u* or theta*. This mathematically requires that {{{zs > z0}}}, or in other words, that {{{z0 < dz/2}}}. In case you have run into this error, you either need to reduce the roughness length z0 or increase the grid spacing dz. ||
 ||[=#PA0505 PA0505]   || Terrain height was internally shifted downwards by ... meter(s) to save computational resources. || Lowest terrain height in model domain is referenced to zero. In case of a nested run, the lowest terrain height is the lowest height among all parent and child domains. Different offset values would lead to edges between the child-parent domain boundaries. ||
-||[=#PA0507 PA0507]   || z0h exceeds surface-layer height at horizontal/vertical natural/urban surface and is decreased appropriately at grid point (i,j) = ... || Roughness length must not exceed the surface-layer height. ||
-||[=#PA0508 PA0508]   || z0 exceeds surface-layer height at sea surface and is decreased appropriately at grid point (i,j) = ... || Roughness length must not exceed the surface-layer height. ||
+||[=#PA0507 PA0507]   || z0h exceeds surface-layer height at horizontal/vertical natural/urban surface and is decreased appropriately at grid point (i,j) = ... || See [wiki:doc/app/errmsg#PA0503 error PA0503] for detailed explanation. ||
+||[=#PA0508 PA0508]   || z0 exceeds surface-layer height at sea surface and is decreased appropriately at grid point (i,j) = ... || See [wiki:doc/app/errmsg#PA0503 error PA0503] for detailed explanation. ||
 ||[=#PA0509 PA0509]   || salinityflux must not be set for ocean run without salinity || You have set parameters {{{top_salinityflux}}} or/and {{{bottom_salinityflux}}} to a non-zero value, and simulataneously switched off the salinity equation. Remove either the flux settings from your parameter file, or set {{{salinity = .TRUE.}}} ||
 ||[=#PA0510 PA0510]   || ocean mode not allowed for nesting || Nesting is not available for the ocean mode. ||