Dear all,

   Bad Timeparamter can lead to CFL error.

    I know :

            dt<3ds

         n*dt=abatm    (n is a integer.n=1,2,.....)

   But when dt<3ds,some  simulation is  aborted all the same.

      

for example :dt=60,ds=60

My simulation is aborted.

 

the failed message:

 

   Writing rad fields at ktau =         9360  2009123112
 BCs are ready from   2009123112   to   2009123118
     at day =  213.5271, ktau =       9400 :  1st, 2nd time deriv of ps =  0.78640E-05 0.28087E-07,  no. of points w/convection =    1533
     at day =  213.5618, ktau =       9450 :  1st, 2nd time deriv of ps =  0.11502E-04 0.27863E-07,  no. of points w/convection =    1507
     at day =  213.5965, ktau =       9500 :  1st, 2nd time deriv of ps =  0.12240E-04 0.23748E-07,  no. of points w/convection =    1524
     at day =  213.6312, ktau =       9550 :  1st, 2nd time deriv of ps =  0.11516E-04 0.24286E-07,  no. of points w/convection =    1558
     at day =  213.6660, ktau =       9600 :  1st, 2nd time deriv of ps =  0.95290E-05 0.24360E-07,  no. of points w/convection =    1580
     at day =  213.7007, ktau =       9650 :  1st, 2nd time deriv of ps =  0.82012E-05 0.22933E-07,  no. of points w/convection =    1601
     at day =  213.7354, ktau =       9700 :  1st, 2nd time deriv of ps =  0.78978E-05 0.21325E-07,  no. of points w/convection =    1623
            *** solar declination angle = -23.02 degrees.
  dectim =    40320.0000000000    
 OUT-history written date =    2009123118.00000    
 LAND variables written at   2009123118  0.000000000000000E+000
 Writing rad fields at ktau =         9720  2009123118
 BCs are ready from   2009123118   to   2010010100
 WHUUUUBBBASAAAGASDDWD!!!!!!!!!!!!!!!!
 No more atmosphere here....
 CFL violation detected, so model STOP
 #####################################
 #            DECREASE DT !!!!       #
 #####################################
  -------------- FATAL CALLED ---------------
  Fatal in file: tend.F90 at line:   2280
  CFL VIOLATION
  -------------------------------------------
forrtl: severe (174): SIGSEGV, segmentation fault occurred
Image              PC        Routine            Line        Source            
libc.so.6          400D9F00  Unknown               Unknown  Unknown
regcmSerial        0825867A  Unknown               Unknown  Unknown
regcmSerial        080EC500  Unknown               Unknown  Unknown
regcmSerial        081834E9  Unknown               Unknown  Unknown
regcmSerial        0804A1B1  Unknown               Unknown  Unknown
libc.so.6          40084F9C  Unknown               Unknown  Unknown
regcmSerial        0804A0D1  Unknown               Unknown  Unknown

 

Best wish.

段玮
Duan Wei
云南省气象科学研究所大气成分应用研究室
Atmospheric Components Laboratory,MIYN

650034 中国云南.昆明市西昌路77号
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