Hi,
Apparently the cfl errors are popping up with me as well and it is not trivial to detect a trend how the system responds to changes in the namelist.
Input is ECMWF data at T799 resolution (from IFS), running through the wps system to generate 27x27 km data. Running this with WRF 4.3.3 seems to be fine. timestep is below the 6*dx threshold, process runs smooth.
Same exercise but now using the sameT799 data to generate input for 12x12 km grid.
This time it seems very difficult to find appropriate settings to avoid the cfl errors.
namelist.input is attached
output from real.exe is enclosed
running wrf on a 16 node cpu with the ulimit -s unlimited
16 nodes should be fine the rule listed indicates number of nodes between 3 and 51.
reducing timestep 60 => 25 does not really help
the smooth_cg_topo true or false does not really help
changing the number of vertical grid levels, or lowering top does not really help
If i reduce the number of grid cells in ew-ns direction should result in a positive (ie. successful) run
So i am looking for some guidance. physical package is standard conus.
The meteorological situation is of a low pressure north or ireland and the domain includes the alps (=elevated area)
I have tried namelist from others in this forum, but no success. So i am kind of stuck.
thanks
stephen
Apparently the cfl errors are popping up with me as well and it is not trivial to detect a trend how the system responds to changes in the namelist.
Input is ECMWF data at T799 resolution (from IFS), running through the wps system to generate 27x27 km data. Running this with WRF 4.3.3 seems to be fine. timestep is below the 6*dx threshold, process runs smooth.
Same exercise but now using the sameT799 data to generate input for 12x12 km grid.
This time it seems very difficult to find appropriate settings to avoid the cfl errors.
namelist.input is attached
output from real.exe is enclosed
running wrf on a 16 node cpu with the ulimit -s unlimited
16 nodes should be fine the rule listed indicates number of nodes between 3 and 51.
reducing timestep 60 => 25 does not really help
the smooth_cg_topo true or false does not really help
changing the number of vertical grid levels, or lowering top does not really help
If i reduce the number of grid cells in ew-ns direction should result in a positive (ie. successful) run
So i am looking for some guidance. physical package is standard conus.
The meteorological situation is of a low pressure north or ireland and the domain includes the alps (=elevated area)
I have tried namelist from others in this forum, but no success. So i am kind of stuck.
thanks
stephen