CFL errors

Topics specifically related to the wrf.exe program
Post Reply
Shubhi
Posts: 4
Joined: Thu Feb 18, 2021 5:45 pm

CFL errors

Post by Shubhi » Fri Apr 02, 2021 9:14 pm

Hello!

I am trying to set up wrf at 9 km resolution and lambert projection for a 612x452 domain over North America, and I am getting the following error message in the wrf log. I have attached the wrf log and namelist input files. I have tried runs with a smaller timestep (18 sec) and increased epssm value, but still get this error. I would appreciate any suggestions.

------------

d01 2015-05-02_13:00:00 18647 points exceeded cfl=2 in domain d01 at time 2015-05-02_13:00:00 hours

d01 2015-05-02_13:00:00 MAX AT i,j,k: 10 11 52 vert_cfl,w,d(eta)= 676.2153 1.2882601E+07 1.7862998E-02

Timing for main: time 2015-05-02_13:00:27 on domain 1: 25.17122 elapsed seconds

--------------



Thank you,
Shubhi
Attachments
rsl.out.txt
(13.81 KiB) Downloaded 8 times
namelist.input.wrf.txt
(8.76 KiB) Downloaded 9 times

kwerner
Posts: 2287
Joined: Wed Feb 14, 2018 9:21 pm

Re: CFL errors

Post by kwerner » Mon Apr 05, 2021 7:03 pm

Hi Shubhi,
If you issue this:

Code: Select all

grep cfl rsl.*
do you see several more cfl errors?
NCAR/MMM

Shubhi
Posts: 4
Joined: Thu Feb 18, 2021 5:45 pm

Re: CFL errors

Post by Shubhi » Mon Apr 05, 2021 7:14 pm

Hi!

Thanks for your response.
Yes, I see this error in multiple log files. I have shared only one log file here.

-Shubhi

kwerner
Posts: 2287
Joined: Wed Feb 14, 2018 9:21 pm

Re: CFL errors

Post by kwerner » Tue Apr 06, 2021 10:46 pm

What type of input data are you using that has 138 levels? Is the p_top of the model really only 10000 Pa? If not, try to decrease that to 5000 and see if that helps any.
NCAR/MMM

Post Reply

Return to “wrf.exe”