Changes between Version 680 and Version 681 of doc/app/errmsg

Timestamp:

Feb 28, 2020 10:20:38 PM (5 years ago)

Author:

gronemeier

Comment:

--

doc/app/errmsg

@@ -723 +723 @@
 ||[=#PA0500 PA0500]   || Unknown turbulence closure: ... || The variable [wiki:doc/app/initialization_parameters#turbulence_closure turbulence_closure] has an unknown value. ||
 ||[=#PA0501 PA0501]   || turbulent inflow/outflow is not yet implemented for RANS mode || Setting [wiki:doc/app/initialization_parameters#turbulent_inflow turbulent_inflow] or [wiki:doc/app/initialization_parameters#turbulent_outflow turbulent_outflow] is not allowed in RANS mode (see namelist parameter [wiki:doc/app/initialization_parameters#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/initialization_parameters#turbulence_closure turbulence_closure] to switch between LES/RANS mode). ||
+||[=#PA0502 PA0502]   ||  ||  ||
 ||[=#PA0503 PA0503]   || z0 exceeds surface-layer height at horizontal/vertical natural/urban surface and is decreased appropriately || 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. \\ '''Attention:''' This message is given only once (for the first grid point where the exceedance has been detected). Be aware that there might be more grid points where z0 exceeds the surface-layer height. ||
 ||[=#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. \\ '''Important:''' You need to shift the respective heights of cross sections and masked output manually, if this informative message appears. ||