<div dir="ltr"><div><div><div><div>Dear Yaoping,<br><br></div>as I see from your rsl. file, instability occurs from vertical velocity. I suggest: Put the upper level damping flag damp_opt=1 and dampcoef to something between 0.01 and 0.1. For me it works fine with 0.01 even in steep mountains. If this still doesn't work you can try additionally to put w_damping=1.<br><br></div>I hope this will help to get your run stable.<br><br></div>with best regards,<br><br></div>Thorsten<br></div><div class="gmail_extra"><br><div class="gmail_quote">2016-03-30 21:12 GMT-05:00 <span dir="ltr"><<a href="mailto:wrf-users-request@ucar.edu" target="_blank">wrf-users-request@ucar.edu</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Send Wrf-users mailing list submissions to<br>
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Today's Topics:<br>
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1. vertical velocity as output variable in ARWpost<br>
(Jose Augusto Paix?o Veiga)<br>
2. Exceeded cfl=2 at the corners of the domain (Wang, Yaoping)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Wed, 30 Mar 2016 15:49:32 -0400<br>
From: Jose Augusto Paix?o Veiga <<a href="mailto:veiga.uea@gmail.com">veiga.uea@gmail.com</a>><br>
Subject: [Wrf-users] vertical velocity as output variable in ARWpost<br>
To: "<a href="mailto:wrf-users@ucar.edu">wrf-users@ucar.edu</a>" <<a href="mailto:wrf-users@ucar.edu">wrf-users@ucar.edu</a>><br>
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Dear users,<br>
<br>
someone knows how to include omega vertical velocity (dp/dt) as an output<br>
of ARWpost?<br>
<br>
I found the following list of available output diagnostic variables in WRF.<br>
But I see no vertical velocity included in.<br>
<br>
<br>
*cape* - 3d cape<br>
*cin* - 3d cin<br>
*mcape* - maximum cape<br>
*mcin* - maximum cin<br>
<br>
*clfr - *low/middle and high cloud fraction<br>
*dbz* - 3d reflectivity<br>
*max_dbz* - maximum reflectivity<br>
<br>
*geopt* - geopotential<br>
*height* - model height in km<br>
<br>
*lcl* - lifting condensation level<br>
*lfc* - level of free convection<br>
*pressure* - full model pressure in hPa<br>
*rh* - relative humidity<br>
*rh2* - 2m relative humidity<br>
*theta* - potential temperature<br>
*tc* - temperature in degrees C<br>
*tk* - temperature in degrees K<br>
*td* - dew point temperature in degrees C<br>
*td2* - 2m dew point temperature in degrees C<br>
<br>
*slp* - sea level pressure<br>
<br>
*umet* and *vmet* - winds rotated to earth coordinates<br>
*u10m* and *v10m* - 10m winds rotated to earth coordinates<br>
*wdir* - wind direction<br>
*wspd* - wind speed coordinates<br>
*wd10* - 10m wind direction<br>
*ws10* - 10m wind speed<br>
<br>
Any help on this will be very welcome .<br>
<br>
Thanks in advance?<br>
<br>
<br>
<br>
Jos? Augusto P. Veiga<br>
CREA n.: 24161<br>
<br>
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Universidade do Estado do Amazonas<br>
Departamento de Meteorologia<br>
Escola Superior de Tecnologia (EST)<br>
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Work phone: (92) 3878 4317, Ramal 4317<br>
Skype: veiga_j.a.p.<br>
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Message: 2<br>
Date: Thu, 31 Mar 2016 01:04:52 +0000<br>
From: "Wang, Yaoping" <<a href="mailto:wang.3866@buckeyemail.osu.edu">wang.3866@buckeyemail.osu.edu</a>><br>
Subject: [Wrf-users] Exceeded cfl=2 at the corners of the domain<br>
To: "<a href="mailto:wrfhelp@ucar.edu">wrfhelp@ucar.edu</a>" <<a href="mailto:wrfhelp@ucar.edu">wrfhelp@ucar.edu</a>><br>
Cc: "<a href="mailto:wrf-users@ucar.edu">wrf-users@ucar.edu</a>" <<a href="mailto:wrf-users@ucar.edu">wrf-users@ucar.edu</a>><br>
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<br>
Hello,<br>
<br>
<br>
I am new to WRF and am setting up a run over the North American domain at 30km resolution. But I keep getting "exceeded cfl=2". After testing various time steps it seems that the error keep occurring at the corners of my domain. I also checked the wind speeds and divergence in the input meteorological data, but did not find any clear outlier models. Could anyone give some suggestions as to what can be done to solve the problem?<br>
<br>
<br>
The trials and errors:<br>
<br>
time step = 180s<br>
<br>
d01 1967-01-01_00:00:00 5537 points exceeded cfl=2 in domain d01 at time 1967-01-01_00:00:00 hours<br>
d01 1967-01-01_00:00:00 MAX AT i,j,k: 283 42 2 vert_cfl,w,d(eta)= 2.4396536E+07 NaN 9.9999905E-03<br>
d01 1967-01-01_00:00:00 1906 points exceeded cfl=2 in domain d01 at time 1967-01-01_00:00:00 hours<br>
d01 1967-01-01_00:00:00 MAX AT i,j,k: 21 190 20 vert_cfl,w,d(eta)= 1102.228 -6444.851 3.5938144E-02<br>
Timing for main: time 1967-01-01_00:03:00 on domain 1: 15.48090 elapsed seconds<br>
<br>
<br>
time step = 90s<br>
<br>
d01 1967-01-01_00:00:00 6080 points exceeded cfl=2 in domain d01 at time 1967-01-01_00:00:00 hours<br>
d01 1967-01-01_00:00:00 MAX AT i,j,k: 283 46 29 vert_cfl,w,d(eta)= 6955.001 -1.8047905E+15 9.2214663E-03<br>
d01 1967-01-01_00:00:00 1969 points exceeded cfl=2 in domain d01 at time 1967-01-01_00:00:00 hours<br>
d01 1967-01-01_00:00:00 MAX AT i,j,k: 278 56 21 vert_cfl,w,d(eta)= 2879.670 56544.66 3.2001421E-02<br>
Timing for main: time 1967-01-01_00:01:30 on domain 1: 13.09157 elapsed seconds<br>
<br>
<br>
time step = 30s, namelist.input &domains smooth_cg_topo = .true.<br>
<br>
d01 1967-01-01_00:00:00 5537 points exceeded cfl=2 in domain d01 at time 1967-01-01_00:00:00 hours<br>
d01 1967-01-01_00:00:00 MAX AT i,j,k: 283 42 2 vert_cfl,w,d(eta)= 2.4396536E+07 NaN 9.9999905E-03<br>
d01 1967-01-01_00:00:00 1906 points exceeded cfl=2 in domain d01 at time 1967-01-01_00:00:00 hours<br>
d01 1967-01-01_00:00:00 MAX AT i,j,k: 21 190 20 vert_cfl,w,d(eta)= 1102.228 -6444.851 3.5938144E-02<br>
<br>
<br>
time step = 10s, namelist.input &domains smooth_cg_topo = .true.<br>
<br>
d01 1967-01-01_00:00:00 2548 points exceeded cfl=2 in domain d01 at time 1967-01-01_00:00:00 hours<br>
d01 1967-01-01_00:00:00 MAX AT i,j,k: 285 179 23 vert_cfl,w,d(eta)= 8.4951393E+14 2.3136813E+23 2.4293438E-02<br>
d01 1967-01-01_00:00:00 987 points exceeded cfl=2 in domain d01 at time 1967-01-01_00:00:00 hours<br>
d01 1967-01-01_00:00:00 MAX AT i,j,k: 285 196 14 vert_cfl,w,d(eta)= 24310.53 372558.9 6.8435431E-02<br>
Timing for main: time 1967-01-01_00:00:10 on domain 1: 15.84628 elapsed seconds<br>
<br>
<br>
The namelist.input file:<br>
<br>
&time_control<br>
run_days = 3,<br>
run_hours = 0,<br>
run_minutes = 0,<br>
run_seconds = 0,<br>
start_year = 1967,<br>
start_month = 01,<br>
start_day = 01,<br>
start_hour = 00,<br>
start_minute = 00,<br>
start_second = 00,<br>
end_year = 1967,<br>
end_month = 01,<br>
end_day = 04,<br>
end_hour = 00,<br>
end_minute = 00,<br>
end_second = 00,<br>
interval_seconds = 21600<br>
input_from_file = .true.<br>
history_interval = 60,<br>
frames_per_outfile = 1000,<br>
restart = .false.,<br>
restart_interval = 5000,<br>
io_form_history = 2<br>
io_form_restart = 2<br>
io_form_input = 2<br>
io_form_boundary = 2<br>
debug_level = 0<br>
/<br>
<br>
&domains<br>
time_step = 10,<br>
time_step_fract_num = 0,<br>
time_step_fract_den = 1,<br>
max_dom = 1,<br>
s_we = 1,<br>
s_sn = 1,<br>
s_vert = 1,<br>
e_we = 290,<br>
e_sn = 200,<br>
e_vert = 30,<br>
p_top_requested = 5000,<br>
num_metgrid_levels = 27,<br>
num_metgrid_soil_levels = 4,<br>
dx = 30000,<br>
dy = 30000,<br>
grid_id = 1,<br>
parent_id = 1,<br>
i_parent_start = 1,<br>
j_parent_start = 1,<br>
smooth_option = 0<br>
smooth_cg_topo = .true.<br>
/<br>
<br>
&physics<br>
mp_physics = 3,<br>
ra_lw_physics = 1,<br>
ra_sw_physics = 1,<br>
radt = 30,<br>
sf_sfclay_physics = 1,<br>
sf_surface_physics = 2,<br>
bl_pbl_physics = 1,<br>
bldt = 0,<br>
cu_physics = 1,<br>
cudt = 5,<br>
isfflx = 1,<br>
ifsnow = 1,<br>
icloud = 1,<br>
surface_input_source = 1,<br>
num_soil_layers = 4,<br>
sf_urban_physics = 0,<br>
/<br>
<br>
&fdda<br>
/<br>
<br>
&dynamics<br>
w_damping = 0,<br>
diff_opt = 1,<br>
km_opt = 4,<br>
diff_6th_opt = 0,<br>
diff_6th_factor = 0.12,<br>
base_temp = 290.<br>
damp_opt = 0,<br>
zdamp = 5000.,<br>
dampcoef = 0.2,<br>
khdif = 0,<br>
kvdif = 0,<br>
non_hydrostatic = .true.,<br>
moist_adv_opt = 1,<br>
scalar_adv_opt = 1,<br>
/<br>
<br>
&bdy_control<br>
spec_bdy_width = 5,<br>
spec_zone = 1,<br>
relax_zone = 5,<br>
specified = .true.,<br>
nested = .false.,<br>
/<br>
<br>
&grib2<br>
/<br>
<br>
&namelist_quilt<br>
nio_tasks_per_group = 0,<br>
nio_groups = 1,<br>
/<br>
<br>
<br>
Thank you very much,<br>
<br>
Yaoping Wang<br>
<br>
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