I am running WRF for 48 hours over Indian region with (27km, 9km, 3km) resolution for 3 nested domains. I'm doing same experiment for number of cases but for one case WRF gives an error " * points exceeded cfl=2 in domain d01 at time 2017-09-14_00:00:00 hours" while running wrf.exe. I tried different time steps and tried changing number of processors also but nothing worked fine. The errors for different time steps and processors are given below:
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with 480 processors:
time_step = 18
WRF NUMBER OF TILES = 1
938 points exceeded cfl=2 in domain d01 at time 2017-09-14_00:00:00 hours
4444 points exceeded cfl=2 in domain d01 at time 2017-09-14_00:00:00 hours
7 points exceeded cfl=2 in domain d01 at time 2017-09-14_00:00:00 hours
time_step = 9
WRF NUMBER OF TILES = 1
261 points exceeded cfl=2 in domain d01 at time 2017-09-14_00:00:00 hours
4331 points exceeded cfl=2 in domain d01 at time 2017-09-14_00:00:00 hours
1 points exceeded cfl=2 in domain d01 at time 2017-09-14_00:00:00 hours
time_step = 6
WRF NUMBER OF TILES = 1
191 points exceeded cfl=2 in domain d01 at time 2017-09-14_00:00:00 hours
4307 points exceeded cfl=2 in domain d01 at time 2017-09-14_00:00:00 hours
with 560
time_step = 18
WRF NUMBER OF TILES = 1
858 points exceeded cfl=2 in domain d01 at time 2017-09-14_00:00:00 hours
3784 points exceeded cfl=2 in domain d01 at time 2017-09-14_00:00:00 hours
7 points exceeded cfl=2 in domain d01 at time 2017-09-14_00:00:00 hours
time_step = 9
WRF NUMBER OF TILES = 1
235 points exceeded cfl=2 in domain d01 at time 2017-09-14_00:00:00 hours
3671 points exceeded cfl=2 in domain d01 at time 2017-09-14_00:00:00 hours
1 points exceeded cfl=2 in domain d01 at time 2017-09-14_00:00:00 hours
time_step = 6
WRF NUMBER OF TILES = 1
173 points exceeded cfl=2 in domain d01 at time 2017-09-14_00:00:00 hours
3648 points exceeded cfl=2 in domain d01 at time 2017-09-14_00:00:00 hours
The namelist file is as below:
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&time_control
run_days = 0,
run_hours = 48,
run_minutes = 0,
run_seconds = 0,
start_year = 2017, 2017, 2017,
start_month = 09, 09, 09,
start_day = 14, 14, 14,
start_hour = 00, 00, 00,
end_year = 2017, 2017, 2017,
end_month = 09, 09, 09,
end_day = 16, 16, 16,
end_hour = 00, 00, 00,
interval_seconds = 3600
input_from_file = .true.,.false.,.false.,
history_interval = 60, 60, 60,
frames_per_outfile = 100, 100, 100,
restart = .false.,
restart_interval = 5000,
io_form_history = 2
io_form_restart = 2
io_form_input = 2
io_form_boundary = 2
auxinput4_inname = "wrflowinp_d01"
auxinput4_interval = 60,
io_form_auxinput4 = 2,
/
&domains
time_step = 6,
time_step_fract_num = 0,
time_step_fract_den = 1,
max_dom = 3,
e_we = 300, 352, 271,
e_sn = 300, 352, 376,
e_vert = 48, 48, 48,
p_top_requested = 1000,
num_metgrid_levels = 32,
num_metgrid_soil_levels = 4,
dx = 27000, 9000, 3000,
dy = 27000, 9000, 3000,
grid_id = 1, 2, 3,
parent_id = 0, 1, 2,
i_parent_start = 1, 95, 124,
j_parent_start = 1, 90, 110,
parent_grid_ratio = 1, 3, 3,
parent_time_step_ratio = 1, 3, 3,
feedback = 1,
smooth_option = 0
/
&physics
mp_physics = 16, 16, 16,
cu_physics = 1, 1, 1,
ra_lw_physics = 1, 1, 1,
ra_sw_physics = 1, 1, 1,
bl_pbl_physics = 2, 2, 2,
sf_sfclay_physics = 2, 2, 2,
sf_surface_physics = 2, 2, 2,
radt = 27, 9, 3,
bldt = 0, 0, 0,
cudt = 2, 2, 2,
isfflx = 1,
ifsnow = 0,
icloud = 1,
num_soil_layers = 4,
num_land_cat = 21,
sf_urban_physics = 1, 1, 1,
maxiens = 1,
maxens = 3,
maxens2 = 3,
maxens3 = 16,
ensdim =144,
sst_update = 1,
/
&fdda
/
&dynamics
hybrid_opt = 2,
w_damping = 0,
diff_opt = 1, 1, 1,
km_opt = 4, 4, 4,
diff_6th_opt = 0, 0, 0,
diff_6th_factor = 0.12, 0.12, 0.12,
base_temp = 290.
damp_opt = 3,
zdamp = 5000., 5000., 5000.,
dampcoef = 0.2, 0.2, 0.2
khdif = 0, 0, 0,
kvdif = 0, 0, 0,
non_hydrostatic = .true., .true., .true.,
moist_adv_opt = 1, 1, 1,
scalar_adv_opt = 1, 1, 1,
gwd_opt = 1,
/
&bdy_control
spec_bdy_width = 5,
spec_zone = 1,
relax_zone = 4,
specified = .true., .false., .false.,
nested = .false., .true., .true.,
/
&grib2
/
&namelist_quilt
nio_tasks_per_group = 0,
nio_groups = 1,
/
The same worked fine for start_date = 2017_09_13 with start_hour = 12 and start_date = 2017_09_15 with start_hour = 12 but it gave same error for start_date = 2017_09_15 with start_hour = 00 then I changed start_date = 2017_09_14 and start_hour = 00 still it gave the same error. I'm using gfs data for WPS.
