The problem about Grid nudging

[Zayn]

Hi all. I met a problem when I run WRF with grid nudging method. My current WRF namelist configuration is as follows. I used the data from ERA5 to drive the model, and I wanted to use nudging method to make the WRF results more close to the background meteorological data. Without nudging, the simulation only takes a few hundredths of a second to simulate one hour. However, after enabling nudging, simulating one hour now takes 1–2 hours. Moreover, the model automatically stops after running for just over one hour, and there is no error message.
Is there something wrong with my namelist settings?

 

[Ming Chen]

I have a few concerns about your namelist:
(1) time_step = 9 for dx =9km is too small. Please change it to 45
(2) dx and dy should have values for all domains ( in your case, max_domain = 2)
(3) cu_physics is better on for D01.
(4) for grid nudging, your options below indicate the nudging interval is 3hr and you only do nudging within the first 3 hours of model run. Is this what you intend to do? If not, please change the options accordingly.
gfdda_interval_m = 180
gfdda_end_h = 3

 

[Zayn]

OK. Thanks a lot !