Changes between Version 662 and Version 663 of doc/app/errmsg

Timestamp:

Nov 29, 2019 10:35:56 AM (6 years ago)

Author:

suehring

Comment:

--

doc/app/errmsg

@@ -355 +355 @@
 ||[=#PA0312 PA0312]   ||Time step has reached minimum limit. \\dt = ... s Simulation is terminated.\\old_dt = ... s\\dt_u = ... s\\dt_v = ... s\\dt_w = ... s\\dt_diff = ... s\\u_max = ... m/s k=... j=... i=...\\v_max = ... m/s k=... j=... i=...\\w_max = ... m/s k=... j=... i=...   ||The time step is determined according to the CFL criterion to assure a stable numerical solution. This error message means that the required minimum time step, determined from the three velocity components, is several orders of magnitude smaller than [../d3par#dt_max dt_max], or, in other words, that at least one of the velocity components got too large. Due to the large number of complex reasons it should be noted that this list is not complete, but it is intended to give general hints how to proceed in case of this error message. First, check for a unrealistic value of [../d3par#dt_max dt_max] in the NAMELIST file. Moreover, this error message may indicate for unrealistic settings of e.g. [../inipar#bc boundary conditions] or other NAMELIST parameters. For very small vertical grid spacing [../inipar#dz dz] this error might also occur if [../inipar#roughness_length roughness_length] >= [../inipar#dz dz]. Please also check if this error appears if you run without USERCODE. To compile and run the PALM and USERCODE with DEBUG-options might also give sometimes valuable hints. 
 To be continued.||
-||[=#PA0313 PA0313]   ||Resolved plant-canopy is is defined on top of a building - lad is omitted at this grid point. ||Even if 'lad' do not overlap with buildings in the input, this situation can appear. Due to numerical reasons one-grid point cavities in topography are filtered, so that building geometries might be changed on this scale. In case tall canopy is directly adjacent to the building before, it may happen that building and plant canopy overlap after the filtering. ||
+||[=#PA0313 PA0313]   ||Resolved plant-canopy is defined on top of an artificially created building grid point (emerged from the filering) - LAD profile is omitted at this grid point: (i,j) = ... ||Due to numerical reasons one-grid point cavities in topography are filtered, so that building geometries might be changed on this scale. In case tall canopy is directly adjacent to the building before, it may happen that building and plant canopy overlap after the filtering. In order to avoid that LAD is mistakenly mapped on top of buildings, which may significantly the downstream flow and radiation properties, LAD profiles at these artificially-created building grid points are ommitted. ||
 ||[=#PA0314 PA0314]   ||External radiation forcing does not cover the entire simulation time. || ||
 ||[=#PA0315 PA0315]   ||In case of external radiation forcing a dynamic input file is required. If no dynamic input for the child domain(s) is provided, at least one for the root domain is needed. || ||