Changeset 828

Timestamp:

Nov 5, 2012, 3:02:40 PM (12 years ago)

Author:

tnavarro

Message:

new option in run.def: ndynstep to run a number of dynamical time step. More efficient thannday for fractions of days

Location:

trunk/LMDZ.MARS

Files:

• README (modified) (1 diff)
• libf/dyn3d/defrun_new.F (modified) (1 diff)
• libf/dyn3d/gcm.F (modified) (2 diffs)

trunk/LMDZ.MARS/README

@@ -1810 +1810 @@
 >> Minor improvement for running fractions of sols; enforce some rounding of
    'Time' (ie: fraction of day) read from the start.nc file in order to limit
-   the accumultation of roundoffs from multiple runs.
+
+== 05/11/2012 == TN
+>> Added new option : ndynstep in run.def, that allows to run for a specific number a dynamical timesteps.
+   If ndynstep is not specified or is negative, nday is used. Otherwise nday value is discarded.
+   The problem with nday alone is that one can only run the GCM for a decimal fraction of one sol.

trunk/LMDZ.MARS/libf/dyn3d/defrun_new.F

@@ -98 +98 @@
         call getin("nday",nday_r)
         WRITE(tapeout,*)" nday = ",nday_r
+        
+        ndynstep=-9999 ! default value
+        call getin("ndynstep",ndynstep)
+        if (ndynstep .gt. 0) then
+          WRITE(tapeout,*) ""
+          WRITE(tapeout,*) "Number of dynamical steps to run:"
+          WRITE(tapeout,*) " ndynstep = ",ndynstep
+          WRITE(tapeout,*) " nday value is now discarded "
+        endif
 
         WRITE(tapeout,*) ""

trunk/LMDZ.MARS/libf/dyn3d/gcm.F

@@ -206 +206 @@
           iday = iday+1
          ENDIF
-      itaufin=nint(nday_r*day_step) ! nint() to avoid problematic roundoffs
+      if (ndynstep .gt. 0) then
+         itaufin = ndynstep
+      else
+         itaufin=nint(nday_r*day_step) ! nint() to avoid problematic roundoffs
+      endif
       ! check that this is compatible with call sequence dyn/phys/dissip
       ! i.e. that itaufin is a multiple of iphysiq and idissip
       if ((modulo(itaufin,iphysiq).ne.0).or.
      &    (modulo(itaufin,idissip).ne.0)) then
-        write(*,*) "gcm: Problem: incompatibility between nday=",nday_r,
+        if (ndynstep .gt. 0) then
+       write(*,'(A,I5)') 
+     &  "gcm: Problem: incompatibility between ndynstep=",ndynstep
+        else
+       write(*,'((A,F9.2),2(A,I5))') 
+     &  "gcm: Problem: incompatibility between nday=",nday_r,
      &  " day_step=",day_step," which imply itaufin=",itaufin
-        write(*,*) "  whereas iphysiq=",iphysiq," and idissip=",
+        endif
+        write(*,'(2(A,I5))') 
+     &   "  whereas iphysiq=",iphysiq," and idissip=",
      &  idissip
         stop
@@ -223 +234 @@
       itaufinp1 = itaufin +1
 
-      day_end = day_ini + floor(nday_r+time_0)
+      if (ndynstep .gt. 0) then
+        day_end = day_ini 
+     &          + floor(float(ndynstep)/float(day_step)+time_0)
+      else
+        day_end = day_ini + floor(nday_r+time_0)
+      endif
       PRINT 300, itau,itaufin,day_ini,day_end
  300  FORMAT('1'/,15x,'run du pas',i7,2x,'au pas',i7,2x,