bartbrashers
New member
I have been testing the MYNN2.5 PBL scheme in stable conditions (wintertime in Alaska) for several projects, some successfully, some not.
Using WRF-4.2.2, with nested 12, 4, and 1.33 km domains, I see lots of CFL errors in the "margins", but never anywhere else.
My d02 is 202 x 202 grid points, and I 'm using 39 vertical levels. The CFL errors occur consistently in the 2nd grid cell from the edge of the domain and consistently at the next-to-top level:
Aren't CFL errors suppressed in points near a domain boundary by the parent domain applying boundary conditions on the child domain? And why would a CFL error happen at the TOP of the domain?
Some relevant chunks of my namelist.input:
Any insights or suggestions would be greatly appreciated!
Bart
Using WRF-4.2.2, with nested 12, 4, and 1.33 km domains, I see lots of CFL errors in the "margins", but never anywhere else.
My d02 is 202 x 202 grid points, and I 'm using 39 vertical levels. The CFL errors occur consistently in the 2nd grid cell from the edge of the domain and consistently at the next-to-top level:
Code:
# grep -i cfl ????-??-??/wrf.rsl.error.00*
2019-12-05/wrf.rsl.error.0028:d02 2019-12-04_13:40:00 1 points exceeded cfl=2 in domain d02 at time 2019-12-04_13:40:00 hours
2019-12-05/wrf.rsl.error.0028:d02 2019-12-04_13:40:00 MAX AT i,j,k: 2 181 38 vert_cfl,w,d(eta)= 2.203470 -18.77660 1.7999999E-02
2019-12-05/wrf.rsl.error.0028:d02 2019-12-04_15:27:24 2 points exceeded cfl=2 in domain d02 at time 2019-12-04_15:27:24 hours
2019-12-05/wrf.rsl.error.0028:d02 2019-12-04_15:27:24 MAX AT i,j,k: 2 199 38 vert_cfl,w,d(eta)= 2.977944 -40.41059 1.7999999E-02
2019-12-05/wrf.rsl.error.0031:d02 2019-12-04_14:04:36 1 points exceeded cfl=2 in domain d02 at time 2019-12-04_14:04:36 hours
2019-12-05/wrf.rsl.error.0031:d02 2019-12-04_14:04:36 MAX AT i,j,k: 199 200 38 vert_cfl,w,d(eta)= 2.241721 -19.70888 1.7999999E-02
2019-12-05/wrf.rsl.error.0031:d02 2019-12-04_14:53:48 1 points exceeded cfl=2 in domain d02 at time 2019-12-04_14:53:48 hours
2019-12-05/wrf.rsl.error.0031:d02 2019-12-04_14:53:48 MAX AT i,j,k: 196 200 38 vert_cfl,w,d(eta)= 3.073648 -35.45598 1.7999999E-02
2019-12-05/wrf.rsl.error.0031:d02 2019-12-04_17:54:24 7 points exceeded cfl=2 in domain d02 at time 2019-12-04_17:54:24 hours
2019-12-05/wrf.rsl.error.0031:d02 2019-12-04_17:54:24 MAX AT i,j,k: 200 199 38 vert_cfl,w,d(eta)= 5.358111 -19.34883 1.7999999E-02
2019-12-20/wrf.rsl.error.0024:d03 2019-12-22_20:02:45 1 points exceeded cfl=2 in domain d03 at time 2019-12-22_20:02:45 hours
2019-12-20/wrf.rsl.error.0024:d03 2019-12-22_20:02:45 MAX AT i,j,k: 2 169 13 vert_cfl,w,d(eta)= 2.059243 -13.70688 1.5999973E-02
2019-12-30/wrf.rsl.error.0027:d02 2019-12-29_18:25:00 5 points exceeded cfl=2 in domain d02 at time 2019-12-29_18:25:00 hours
2019-12-30/wrf.rsl.error.0027:d02 2019-12-29_18:25:00 MAX AT i,j,k: 87 200 38 vert_cfl,w,d(eta)= 2.956032 -36.84430 1.7999999E-02
2019-12-30/wrf.rsl.error.0031:d02 2019-12-29_13:29:12 2 points exceeded cfl=2 in domain d02 at time 2019-12-29_13:29:12 hours
2019-12-30/wrf.rsl.error.0031:d02 2019-12-29_13:29:12 MAX AT i,j,k: 197 200 38 vert_cfl,w,d(eta)= 2.357880 -21.55417 1.7999999E-02
2019-12-30/wrf.rsl.error.0031:d02 2019-12-29_16:22:00 2 points exceeded cfl=2 in domain d02 at time 2019-12-29_16:22:00 hours
2019-12-30/wrf.rsl.error.0031:d02 2019-12-29_16:22:00 MAX AT i,j,k: 199 200 38 vert_cfl,w,d(eta)= 2.172655 -19.27447 1.7999999E-02
2019-12-30/wrf.rsl.error.0031:d02 2019-12-29_17:17:48 1 points exceeded cfl=2 in domain d02 at time 2019-12-29_17:17:48 hours
2019-12-30/wrf.rsl.error.0031:d02 2019-12-29_17:17:48 MAX AT i,j,k: 200 197 38 vert_cfl,w,d(eta)= 2.382340 -17.79342 1.7999999E-02
2019-12-30/wrf.rsl.error.0031:d02 2019-12-29_18:52:36 1 points exceeded cfl=2 in domain d02 at time 2019-12-29_18:52:36 hours
2019-12-30/wrf.rsl.error.0031:d02 2019-12-29_18:52:36 MAX AT i,j,k: 198 200 38 vert_cfl,w,d(eta)= 2.026072 -16.73941 1.7999999E-02Aren't CFL errors suppressed in points near a domain boundary by the parent domain applying boundary conditions on the child domain? And why would a CFL error happen at the TOP of the domain?
Some relevant chunks of my namelist.input:
Code:
max_dom = 3,
p_top_requested = 5000,
e_vert = 39, 39, 39,
eta_levels = 1.0000, 0.9995, 0.9990, 0.9984, 0.99705,
0.99415, 0.99155, 0.9860, 0.9780, 0.9660,
0.9500, 0.9340, 0.9180, 0.9020, 0.8860,
0.8660, 0.8420, 0.8140, 0.7800, 0.7400,
0.6940, 0.6480, 0.6020, 0.5560, 0.5100,
0.4640, 0.4180, 0.3720, 0.3260, 0.2820,
0.2400, 0.2000, 0.1630, 0.1280, 0.0960,
0.0660, 0.0400, 0.0180, 0.0000,
use_adaptive_time_step = .true.,
step_to_output_time = .true.,
adaptation_domain = 3,
target_cfl = 0.6, 0.6, 0.6,
target_hcfl = 0.6, 0.6, 0.6,
max_step_increase_pct = 3, 51, 51,
starting_time_step = 6, 2, 1,
max_time_step = 36, 12, 4,
min_time_step = 1, 1, 1,
min_time_step_den = 1, 10, 10,
&physics
mp_physics = 10, 10, 10,
ra_lw_physics = 4, 4, 4,
ra_sw_physics = 4, 4, 4,
radt = 20, 20, 20,
sf_surface_physics = 2, 2, 2,
sf_sfclay_physics = 5, 5, 5,
bl_pbl_physics = 5, 5, 5,
bldt = 0, 0, 0,
cu_physics = 1, 0, 0,
cudt = 0, 0, 0,
kfeta_trigger = 2,Any insights or suggestions would be greatly appreciated!
Bart