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7269 Views 4 Replies Latest reply: Oct 30, 2014 9:32 PM by jomy nn RSS
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Jul 26, 2013 4:59 PM

Numerical instability in WRF run using initial conditions from LIS

INITIALIZE THREE Noah LSM RELATED TABLES
WRF TILE   1 IS     80 IE    105 JS    100 JE    113
WRF NUMBER OF TILES =   1
SRD Diagnostics: Resetting max arrays for domain with dt =    9.000000
WRF TILE   1 IS    131 IE    173 JS    169 JE    192
WRF NUMBER OF TILES =   1
SRD Diagnostics: Resetting max arrays for domain with dt =    3.000000
d03 2006-09-18_00:02:48            1 points exceeded cfl=2 in domain d03 at tim
e 2006-09-18_00:02:48 hours
d03 2006-09-18_00:02:48  MAX AT i,j,k:          172         178           3 ver
t_cfl,w,d(eta)=   2.203948      -54.79370      1.2999952E-02
d03 2006-09-18_00:02:51            1 points exceeded cfl=2 in domain d03 at tim
e 2006-09-18_00:02:51 hours
d03 2006-09-18_00:02:51  MAX AT i,j,k:          173         178           3 ver
t_cfl,w,d(eta)=   2.312934       62.01522      1.2999952E-02
d03 2006-09-18_00:03:06            2 points exceeded cfl=2 in domain d03 at tim
e 2006-09-18_00:03:06 hours
d03 2006-09-18_00:03:06  MAX AT i,j,k:          173         178           4 ver
t_cfl,w,d(eta)=   2.327125      -46.80587      1.6000032E-02
d03 2006-09-18_00:03:06            6 points exceeded cfl=2 in domain d03 at tim
e 2006-09-18_00:03:06 hours
d03 2006-09-18_00:03:06  MAX AT i,j,k:          172         178           3 ver
t_cfl,w,d(eta)=   2.754047      -170.9862      1.2999952E-02

I am currently attempting to get a WRF run started using initial conditions from a LIS model run.  I have run this case before using initial conditions from NARR (my forcing dataset) as a standard wrf run (same physics, etc) and it seemed to work fine.  Now I keep having problems with numerical stability of the model (see below).  Has anyone had similar problems?  My timestep is fairly small (3dx).     

 

Here's a bit of my log file (The namelist.input file is attached):

 

INITIALIZE THREE Noah LSM RELATED TABLES

WRF TILE   1 IS     80 IE    105 JS    100 JE    113

WRF NUMBER OF TILES =   1

SRD Diagnostics: Resetting max arrays for domain with dt =    9.000000

WRF TILE   1 IS    131 IE    173 JS    169 JE    192

WRF NUMBER OF TILES =   1

SRD Diagnostics: Resetting max arrays for domain with dt =    3.000000

d03 2006-09-18_00:02:48            1 points exceeded cfl=2 in domain d03 at tim

e 2006-09-18_00:02:48 hours

d03 2006-09-18_00:02:48  MAX AT i,j,k:          172         178           3 ver

t_cfl,w,d(eta)=   2.203948      -54.79370      1.2999952E-02

d03 2006-09-18_00:02:51            1 points exceeded cfl=2 in domain d03 at tim

e 2006-09-18_00:02:51 hours

d03 2006-09-18_00:02:51  MAX AT i,j,k:          173         178           3 ver

t_cfl,w,d(eta)=   2.312934       62.01522      1.2999952E-02

d03 2006-09-18_00:03:06            2 points exceeded cfl=2 in domain d03 at tim

e 2006-09-18_00:03:06 hours

d03 2006-09-18_00:03:06  MAX AT i,j,k:          173         178           4 ver

t_cfl,w,d(eta)=   2.327125      -46.80587      1.6000032E-02

d03 2006-09-18_00:03:06            6 points exceeded cfl=2 in domain d03 at tim

e 2006-09-18_00:03:06 hours

d03 2006-09-18_00:03:06  MAX AT i,j,k:          172         178           3 ver

t_cfl,w,d(eta)=   2.754047      -170.9862      1.2999952E-02

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